Hematuria: Difference between revisions
→In children: add ref |
Citation bot (talk | contribs) Add: pmid, publisher, authors 1-1. Removed parameters. Some additions/deletions were parameter name changes. | Use this bot. Report bugs. | Suggested by Spinixster | Category:Glomerular diseases | #UCB_Category 2/14 |
||
| (17 intermediate revisions by 12 users not shown) | |||
| Line 1: | Line 1: | ||
{{Short description|Presence of blood in urine}} |
|||
{{Infobox medical condition (new) |
{{Infobox medical condition (new) |
||
| name |
| name = Hematuria |
||
| synonyms |
| synonyms = Haematuria, erythrocyturia, blood in the urine |
||
| image |
| image = HematuriaGross.jpg |
||
| caption |
| caption = Visible hematuria that is tea-colored |
||
| pronounce |
| pronounce = |
||
| field |
| field = [[Nephrology]], [[Urology]] |
||
| symptoms |
| symptoms = Blood in the urine |
||
| complications = |
| complications = |
||
| onset |
| onset = |
||
| duration |
| duration = |
||
| types |
| types = |
||
| causes |
| causes = [[Urinary tract infection]], [[kidney stone]], [[bladder cancer]], [[kidney cancer]] |
||
| risks |
| risks = |
||
| diagnosis |
| diagnosis = |
||
| prevention |
| prevention = |
||
| treatment |
| treatment = |
||
| medication |
| medication = |
||
| prognosis |
| prognosis = |
||
| frequency |
| frequency = |
||
| deaths |
| deaths = |
||
| alt |
| alt = |
||
}} |
}} |
||
'''Hematuria''' or '''haematuria''' is defined as the presence of [[blood]] or [[red blood cell]]s in the [[urine]].<ref name=":3" /> "Gross hematuria" occurs when urine appears red, brown, or tea-colored due to the presence of blood. Hematuria may also be subtle and only detectable with a microscope or laboratory test.<ref name=":1" /> Blood that enters and mixes with the urine can come from any location within the [[urinary system]], including the [[kidney]], [[ureter]], [[urinary bladder]], [[urethra]], and in men, the [[prostate]].<ref name=":4" /> Common causes of hematuria include [[Urinary tract infection|urinary tract infection (UTI)]], [[Kidney Stones|kidney stones]], viral illness, trauma, bladder cancer, and exercise.<ref name=":0" /> These causes are grouped into glomerular and non-glomerular causes, depending on the involvement of the [[Glomerulus (kidney)|glomerulus of the kidney]].<ref name=":3" /> But not all red urine is hematuria.<ref name=":93" /> Other substances such as certain medications and foods (e.g. blackberries, beets, food dyes) can cause urine to appear red.<ref name=":93" /> [[Menstruation]] in women may also cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.<ref name=":2" /> A [[Urine test strip|urine dipstick]] test may also give an incorrect positive result for hematuria if there are other substances in the urine such as [[myoglobin]], a protein excreted into urine during [[rhabdomyolysis]]. A positive [[urine dipstick]] test should be confirmed with microscopy, where hematuria is defined by three |
'''Hematuria''' or '''haematuria''' is defined as the presence of [[blood]] or [[red blood cell]]s in the [[urine]].<ref name=":3" /> "Gross hematuria" occurs when urine appears red, brown, or tea-colored due to the presence of blood. Hematuria may also be subtle and only detectable with a microscope or laboratory test.<ref name=":1" /> Blood that enters and mixes with the urine can come from any location within the [[urinary system]], including the [[kidney]], [[ureter]], [[urinary bladder]], [[urethra]], and in men, the [[prostate]].<ref name=":4" /> Common causes of hematuria include [[Urinary tract infection|urinary tract infection (UTI)]], [[Kidney Stones|kidney stones]], viral illness, trauma, bladder cancer, and exercise.<ref name=":0" /> These causes are grouped into glomerular and non-glomerular causes, depending on the involvement of the [[Glomerulus (kidney)|glomerulus of the kidney]].<ref name=":3" /> But not all red urine is hematuria.<ref name=":93" /> Other substances such as certain medications and foods (e.g. blackberries, beets, food dyes) can cause urine to appear red.<ref name=":93" /> [[Menstruation]] in women may also cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.<ref name=":2" /> A [[Urine test strip|urine dipstick]] test may also give an incorrect positive result for hematuria if there are other substances in the urine such as [[myoglobin]], a protein excreted into urine during [[rhabdomyolysis]]. A positive [[urine dipstick]] test should be confirmed with microscopy, where hematuria is defined by three or more red blood cells per [[High-power field|high power field]].<ref name=":2" /> When hematuria is detected, a thorough history and physical examination with appropriate further evaluation (e.g. laboratory testing) can help determine the underlying cause.<ref name=":3" /> |
||
== Differential diagnosis == |
== Differential diagnosis == |
||
[[File:Sources of Hematuria by Anatomic Location.png|thumb|474x474px|alt=]]Hematuria can be classified according to visibility, anatomical origin, and timing of blood during urination.<ref name=":3">{{Cite book |last1=Papadakis |first1=Maxine A. |title=Current medical diagnosis & treatment 2022 |last2=McPhee |first2=Stephen J. |last3=Rabow |first3=Michael W. |date=14 September 2021 |isbn=978-1-264-26938-9 |at=23-02: Hematuria |oclc=1268130534}}</ref><ref name=":2">{{Cite book |last=Stern |first=Scott D. C. |title=Symptom to diagnosis: an evidence-based guide |at=Chapter 21-1: Approach to the Patient with Hematuria – Case 1 |oclc=1121597721}}</ref> |
[[File:Sources of Hematuria by Anatomic Location.png|thumb|474x474px|alt=]]Hematuria can be classified according to visibility, anatomical origin, and timing of blood during urination.<ref name=":3">{{Cite book |last1=Papadakis |first1=Maxine A. |title=Current medical diagnosis & treatment 2022 |last2=McPhee |first2=Stephen J. |last3=Rabow |first3=Michael W. |date=14 September 2021 |publisher=McGraw-Hill Education |isbn=978-1-264-26938-9 |at=23-02: Hematuria |oclc=1268130534}}</ref><ref name=":2">{{Cite book |last=Stern |first=Scott D. C. |title=Symptom to diagnosis: an evidence-based guide |at=Chapter 21-1: Approach to the Patient with Hematuria – Case 1 |oclc=1121597721}}</ref> |
||
* In terms of |
* '''In terms of visibility,''' hematuria can be visible to the naked eye (termed "gross hematuria") and may appear red or brown (sometimes referred to as tea-colored), or it can be microscopic (i.e. not visible but detected with a microscope or laboratory test).<ref name=":1">{{Citation |last=Kirkpatrick |first=Wanda G. |title=Clinical Methods: The History, Physical, and Laboratory Examinations |date=1990 |work= |editor-last=Walker |editor-first=H. Kenneth |chapter=Chapter 184 – Hematuria |chapter-url=http://www.ncbi.nlm.nih.gov/books/NBK294/ |edition=3rd |place=Boston |publisher=Butterworths |isbn=978-0-409-90077-4 |pmid=21250137 |access-date=2022-01-17 |editor2-last=Hall |editor2-first=W. Dallas |editor3-last=Hurst |editor3-first=J. Willis}}</ref><ref name=":2" /> Microscopic hematuria is present when there are three or more red blood cells per [[High-power field|high power field]].<ref name=":4">{{Cite book |title=Campbell-Walsh-Wein urology |date=2021 |isbn=978-0-323-54642-3 |editor1-first=Alan W. |editor1-last=Partin |edition=Twelfth |location=Philadelphia, Pennsylvania |chapter=Evaluation and Management of Hematuria |oclc=1130700336 |editor2-first=Roger R. |editor2-last=Dmochowski |editor3-first=Louis R. |editor3-last=Kavoussi |editor4-first=Craig |editor4-last=Peters}}</ref> |
||
* In terms of the anatomical origin, blood or red blood cells can enter and mix with urine at multiple anatomical sites within the [[urinary system]], including the [[kidney]], [[ureter]], [[urinary bladder]], and [[urethra]], and in men, the [[prostate]].<ref name=":3" /> Additionally, menstruation in women may cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.<ref name=":4" /> The causes corresponding to these anatomic locations can be divided into glomerular and non-glomerular causes, referring to the involvement of the [[Glomerulus (kidney)|glomerulus of the kidney]].<ref name=":0">{{Citation |last1=Saleem |first1=Muhammad O. |title=Hematuria |date=2022 |url=http://www.ncbi.nlm.nih.gov/books/NBK534213/ |work=StatPearls |place=Treasure Island, Florida |publisher=StatPearls Publishing |pmid=30480952 |access-date=2022-01-17 |last2=Hamawy |first2=Karim}}</ref> Non-glomerular causes can be further subdivided into upper urinary tract and lower urinary tract causes.<ref name=":3" /> |
* '''In terms of the anatomical origin,''' blood or red blood cells can enter and mix with urine at multiple anatomical sites within the [[urinary system]], including the [[kidney]], [[ureter]], [[urinary bladder]], and [[urethra]], and in men, the [[prostate]].<ref name=":3" /> Additionally, menstruation in women may cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.<ref name=":4" /> The causes corresponding to these anatomic locations can be divided into glomerular and non-glomerular causes, referring to the involvement of the [[Glomerulus (kidney)|glomerulus of the kidney]].<ref name=":0">{{Citation |last1=Saleem |first1=Muhammad O. |title=Hematuria |date=2022 |url=http://www.ncbi.nlm.nih.gov/books/NBK534213/ |work=StatPearls |place=Treasure Island, Florida |publisher=StatPearls Publishing |pmid=30480952 |access-date=2022-01-17 |last2=Hamawy |first2=Karim}}</ref> Non-glomerular causes can be further subdivided into the upper urinary tract and lower urinary tract causes.<ref name=":3" /> |
||
* In terms of the timing during urination, hematuria can be initial, terminal or total, meaning blood can appear in the urine at the onset, midstream, or later.<ref name=":3" /><ref name=":93" /> If it appears soon after the onset of urination, a distal site is suggested.<ref name=":93" /> A longer delay suggests a more proximal lesion.<ref name=":93" /> |
* '''In terms of the timing during urination,''' hematuria can be initial, terminal or total, meaning blood can appear in the urine at the onset, midstream, or later.<ref name=":3" /><ref name=":93" /> If it appears soon after the onset of urination, a distal site is suggested.<ref name=":93" /> A longer delay suggests a more proximal lesion.<ref name=":93" /> Hematuria that occurs throughout urination suggests that bleeding is occurring above the level of the bladder.<ref name=":93" /> |
||
Many causes may present as either visible hematuria or microscopic hematuria, and so the differential diagnosis is frequently organized based |
Many causes may present as either visible hematuria or microscopic hematuria, and so the differential diagnosis is frequently organized based on glomerular and non-glomerular causes.<ref name=":0" /><ref name=":2" /> |
||
=== Glomerular hematuria === |
=== Glomerular hematuria === |
||
[[File:The presence of blood in urine bag.jpg|thumb|Postrenal hematuria - the presence of blood in urine (because of damage to the urethra and prostate).]] |
[[File:The presence of blood in urine bag.jpg|thumb|Postrenal hematuria - the presence of blood in urine (because of damage to the urethra and prostate).]] |
||
Hematuria due to a glomerular source commonly presents as dysmorphic red blood cells (misshapen red blood cells) or [[urinary cast|red cell casts]] (small tubular structures made up of red blood cell components) on urine microscopy. This occurs due to the red blood cells being deformed as they pass through the [[glomerular capillaries]] into the renal tubules and eventually into the urinary system.<ref name="Ingelfinger 2021">{{cite journal |last1=Ingelfinger |first1=Julie R. |date=8 July 2021 |title=Hematuria in Adults |journal=New England Journal of Medicine |volume=385 |issue=2 |pages=153–163 |doi=10.1056/NEJMra1604481|pmid=34233098 }}</ref> Normally, red blood cells should never pass from the glomerular capillary into the renal tubule, and this is always a pathological process. Glomerular causes include: |
|||
Glomerular causes include: |
|||
* [[IgA nephropathy]]<ref name=":0" /> |
* [[IgA nephropathy]]<ref name=":0" /> |
||
* [[Thin basement membrane disease|Thin glomerular basement membrane disease]]<ref name=":0" /> |
* [[Thin basement membrane disease|Thin glomerular basement membrane disease]]<ref name=":0" /> |
||
* [[Hereditary nephritis]] (Alport's disease)<ref name=":2" /> |
* [[Hereditary nephritis]] (Alport's disease)<ref name=":2" /> |
||
* [[Hemolytic–uremic syndrome|Hemolytic uremic syndrome]]<ref name=":2" /> |
* [[Hemolytic–uremic syndrome|Hemolytic uremic syndrome]]<ref name=":2" /> |
||
* [[Acute proliferative glomerulonephritis|Postinfectious glomerulonephritis]]<ref name=":0" /> |
* [[Acute proliferative glomerulonephritis|Postinfectious glomerulonephritis]]<ref name=":0" /> (group A β-hemolytic ''streptococcus pyogenes'') |
||
** Certain infectious agents like Group B Strep(strep pyogenes) can cause a person to get a very specific manifestation known as post-streptococcal glomerulonephritis. This manifestation results in a person having the symptom of cola-colored urine. |
|||
* [[Membranoproliferative glomerulonephritis]]<ref name=":0" /> |
* [[Membranoproliferative glomerulonephritis]]<ref name=":0" /> |
||
* [[Lupus nephritis]]<ref name=":0" /> |
* [[Lupus nephritis]]<ref name=":0" /> |
||
* [[Henoch–Schönlein |
* [[Henoch–Schönlein purpura]]<ref name=":2" /> |
||
* [[Nephritic syndrome]]<ref>{{Citation |last1=Hashmi |first1=Mydah S. |title=Nephritic Syndrome |date=2022 |url=http://www.ncbi.nlm.nih.gov/books/NBK562240/ |work=StatPearls |place=[[Treasure Island, Florida]] |publisher=StatPearls Publishing |pmid=32965911 |access-date=2022-01-19 |last2=Pandey |first2=Jyotsna}}</ref> |
* [[Nephritic syndrome]]<ref>{{Citation |last1=Hashmi |first1=Mydah S. |title=Nephritic Syndrome |date=2022 |url=http://www.ncbi.nlm.nih.gov/books/NBK562240/ |work=StatPearls |place=[[Treasure Island, Florida]] |publisher=StatPearls Publishing |pmid=32965911 |access-date=2022-01-19 |last2=Pandey |first2=Jyotsna}}</ref> |
||
* [[Nephrotic syndrome]]<ref name=":0" /> |
* [[Nephrotic syndrome]]<ref name=":0" /> |
||
| Line 79: | Line 80: | ||
==== False positive urine dipstick ==== |
==== False positive urine dipstick ==== |
||
A [[urine dipstick]] may be falsely positive for hematuria due to other substances in the urine.<ref name=":2" /> While the urine dipstick test is able to recognize [[heme]] in red blood cells, it also identifies free hemoglobin and myoglobin.<ref name=":2" /> Free hemoglobin may be found in the urine resulting from [[hemolysis]], and [[myoglobin]] may be found in the urine resulting from [[rhabdomyolysis]].<ref name=":2" /><ref name=":93">{{Cite book|last1=McAninch|first1=Jack W.|title=Smith & Tanagho's General Urology|last2=Lue|first2=Tom|publisher=McGraw-Hill Education|year=2013|pages=|chapter=Chapter 3: Symptoms of Disorders of the Genitourinary Tract}}</ref> Thus, a positive dipstick test does not necessarily indicate hematuria; rather, microscopy of the urine showing three of more red blood cells per [[High-power field|high power field]] confirms hematuria.<ref name=":2" /><ref name=":4" /> |
A [[urine dipstick]] may be falsely positive for hematuria due to other substances in the urine.<ref name=":2" /> While the urine dipstick test is able to recognize [[heme]] in red blood cells, it also identifies free hemoglobin and myoglobin.<ref name=":2" /> Free hemoglobin may be found in the urine resulting from [[hemolysis]], and [[myoglobin]] may be found in the urine resulting from [[rhabdomyolysis]] (muscle breakdown).<ref name=":2" /><ref name=":93">{{Cite book|last1=McAninch|first1=Jack W.|title=Smith & Tanagho's General Urology|last2=Lue|first2=Tom|publisher=McGraw-Hill Education|year=2013|pages=|chapter=Chapter 3: Symptoms of Disorders of the Genitourinary Tract}}</ref> Thus, a positive dipstick test does not necessarily indicate hematuria; rather, microscopy of the urine showing three of more red blood cells per [[High-power field|high power field]] confirms hematuria.<ref name=":2" /><ref name=":4" /> |
||
==== Menstruation ==== |
==== Menstruation ==== |
||
| Line 102: | Line 103: | ||
=== Visible hematuria === |
=== Visible hematuria === |
||
The first step in evaluation of red or brown colored urine is to confirm true hematuria with urinalysis and urine microscopy, where hematuria is defined by three of more red blood cells per [[High-power field|high power field]].<ref name=":4" /> Although a urine dipstick test may be used, it can give false positive or false negative results.<ref name=":0" /> In gathering information, it is important to inquire about recent trauma, urologic procedures, [[menses]], and culture-documented [[urinary tract infection]].<ref name=":4" /> If any of these are present, it is appropriate to repeat a urinalysis with urine microscopy in 1 to 2 weeks or after treatment of the infection.<ref name=":2" /><ref name=":4" /> If the results of the urinalysis and urine microscopy reveal a glomerular origin of hematuria (indicated by [[proteinuria]] or [[Red cell cast|red blood cell casts]]), consultation |
The first step in evaluation of red or brown colored urine is to confirm true hematuria with urinalysis and urine microscopy, where hematuria is defined by three of more red blood cells per [[High-power field|high power field]].<ref name=":4" /> Although a urine dipstick test may be used, it can give false positive or false negative results.<ref name=":0" /> In gathering information, it is important to inquire about recent trauma, urologic procedures, [[menses]], and culture-documented [[urinary tract infection]].<ref name=":4" /> If any of these are present, it is appropriate to repeat a urinalysis with urine microscopy in 1 to 2 weeks or after treatment of the infection.<ref name=":2" /><ref name=":4" /> If the results of the urinalysis and urine microscopy reveal a glomerular origin of hematuria (indicated by [[proteinuria]] or [[Red cell cast|red blood cell casts]]), consultation with a [[nephrologist]] should be made.<ref name=":2" /> If the results of the urinalysis indicate a non-glomerular origin, a [[microbiological culture]] of the urine should be performed, if it has not been done already.<ref name=":2" /> If the culture is positive (indicating a bladder infection), urinalysis and urine microscopy should be repeated following treatment to confirm resolution of the hematuria.<ref name=":2" /> If the culture is negative or if hematuria persists after treatment, [[Computed tomography urography|CT urogram]] or [[renal ultrasound]] and [[cystoscopy]] should be performed.<ref name=":2" /><ref name="Ingelfinger 2021" /> Hemodynamic stability should be monitored and a [[complete blood count]] should be ordered to assess for anemia.<ref name=":4" /> |
||
In summary, those with visible hematuria confirmed by urinalysis and urine microscopy and with no recent trauma, urologic procedures, menses, or urinary tract infection should undergo [[cystoscopy]] and [[Computed tomography urography|CT urogram]].<ref name=":4" /> |
|||
=== Microscopic hematuria === |
=== Microscopic hematuria === |
||
{{update section}} |
{{update section|date=March 2023}} |
||
[[File:Urine cytology with red blood cells.jpg|thumb|[[Red blood cells]] seen on [[light microscopy]] on [[urinary cytology]], next to benign urothelial cells ([[pap stain]]).]] |
[[File:Urine cytology with red blood cells.jpg|thumb|[[Red blood cells]] seen on [[light microscopy]] on [[urinary cytology]], next to benign urothelial cells ([[pap stain]]).]] |
||
After detecting and confirming hematuria with urinalysis and urine microscopy, the first step in evaluation of [[microhematuria]] is to rule out benign causes.<ref name=":5">{{Cite journal | |
After detecting and confirming hematuria with urinalysis and urine microscopy, the first step in evaluation of [[microhematuria]] is to rule out benign causes.<ref name=":5">{{Cite journal |last1=Davis |first1=Rodney |last2=Jones |first2=J. Stephen |last3=Barocas |first3=Daniel A. |last4=Castle |first4=Erik P. |last5=Lang |first5=Erich K. |last6=Leveillee |first6=Raymond J. |last7=Messing |first7=Edward M. |last8=Miller |first8=Scott D. |last9=Peterson |first9=Andrew C. |last10=Turk |first10=Thomas M. T. |last11=Weitzel |first11=William |date=2012-12-01 |title=Diagnosis, Evaluation and Follow-Up of Asymptomatic Microhematuria (AMH) in Adults: AUA Guideline |url=https://www.auajournals.org/doi/10.1016/j.juro.2012.09.078 |journal=Journal of Urology |publication-date=2012 |volume=188 |issue=6S |pages=2473–2481 |doi=10.1016/j.juro.2012.09.078 |pmid=23098784}}</ref> Benign causes include [[urinary tract infection]], viral illness, [[Kidney stone disease|kidney stone]], recent intense exercise, [[menses]], recent trauma, or recent [[urological]] procedure.<ref name=":5" /> After benign causes have resolved or been treated, a repeat urinalysis and urine microscopy is warranted to ensure cessation of hematuria.<ref name=":5" /> If hematuria persists (even if there is a suspected cause), the next step is to stratify the risk of the person for [[urothelial cancer]] into low, intermediate, or high risk to determine next steps.<ref name=":6">{{Cite journal|last1=Barocas|first1=Daniel A.|last2=Boorjian|first2=Stephen A.|last3=Alvarez|first3=Ronald D.|last4=Downs|first4=Tracy M.|last5=Gross|first5=Cary P.|last6=Hamilton|first6=Blake D.|last7=Kobashi|first7=Kathleen C.|last8=Lipman|first8=Robert R.|last9=Lotan|first9=Yair|last10=Ng|first10=Casey K.|last11=Nielsen|first11=Matthew E.|date=2020-10-01|title=Microhematuria: AUA/SUFU Guideline|journal=Journal of Urology|volume=204|issue=4|pages=778–786|doi=10.1097/JU.0000000000001297|pmid=32698717|s2cid=220717643|doi-access=free}}</ref> To be in the low risk category, one must satisfy ''all'' of the following criteria: Has never smoked tobacco or smoked less than 10 [[pack-year]]s; is a female less than 50 years old or a male less than 40 years old; has 3–10 [[red blood cell]]s per [[High-power field|high power field]]; has not had microscopic hematuria before; and has no other risk factors for urothelial cancer.<ref name=":6" /> To be in the intermediate risk category, one must satisfy ''any'' of the following criteria: Has smoked 10–30 [[pack-year]]s; is a female 50–59 years old or a male aged 40–59 years old; has 11–25 [[red blood cell]]s per [[High-power field|high power field]]; or was previously a low-risk patient with persistent microscopic hematuria and has 3–25 [[red blood cell]]s per [[High-power field|high power field]].<ref name=":6" /> To be in the high risk category, one must satisfy ''any'' of the following criteria: Has smoked more than 30 [[pack-year]]s; is older than 60 years of age; or has above 25 [[red blood cell]]s per [[High-power field|high power field]] on any urinalysis.<ref name=":6" /> For the low risk category, the next step is to either repeat a urinalysis with urine microscopy in 6 months or perform a [[cystoscopy]] and [[renal]] [[ultrasound]].<ref name=":6" /> For the intermediate risk category, the next step is to perform a [[cystoscopy]] and [[renal]] [[ultrasound]].<ref name=":6" /> For the high risk category, the next step is to perform a [[cystoscopy]] and [[CT urogram]].<ref name=":6" /> If an underlying cause for hematuria is discovered, it should be managed appropriately.<ref name=":6" /> However, if no underlying cause is discovered, the hematuria should be re-evaluated with urinalysis and urine microscopy within 12 months.<ref name=":6" /> Additionally, for all risk categories, if a [[Nephrology|nephrologic]] origin is suspected, consultation of a [[nephrologist]] should be made.<ref name=":6" /> |
||
== Pathophysiology == |
== Pathophysiology == |
||
| Line 127: | Line 126: | ||
== Epidemiology == |
== Epidemiology == |
||
In the United States, microscopic hematuria has a prevalence of somewhere between 2% and 31%.<ref name=":35">{{Cite journal|last=Coplen|first=D. E.|date=January 2013|title=Diagnosis, Evaluation and Follow-Up of Asymptomatic Microhematuria (AMH) in Adults: AUA Guideline|journal=Yearbook of Urology |volume=2013|pages=1–2|doi=10.1016/j.yuro.2013.07.019|issn=0084-4071}}</ref> Higher rates exist in individuals older than 60 years of age and those with a current or prior history of smoking.<ref name=":35" /> Only a fraction of individuals with microhematuria are diagnosed with a urologic cancer.<ref name=":35" /> When asymptomatic populations are screened with dipstick and/or microscopy medical testing about 2% to 3% of those with hematuria have a urologic [[Malignancies|malignancy]].<ref name=":35" /> Routine screening is not recommended.<ref name=":35" /> Individuals with risk factors who undergo repeated testing have higher rates of urologic malignancies.<ref name=":35" /> These risks factors include age (> |
In the United States, microscopic hematuria has a prevalence of somewhere between 2% and 31%.<ref name=":35">{{Cite journal|last=Coplen|first=D. E.|date=January 2013|title=Diagnosis, Evaluation and Follow-Up of Asymptomatic Microhematuria (AMH) in Adults: AUA Guideline|journal=Yearbook of Urology |volume=2013|pages=1–2|doi=10.1016/j.yuro.2013.07.019|issn=0084-4071}}</ref><ref name="Ingelfinger 2021" /> Higher rates exist in individuals older than 60 years of age and those with a current or prior history of smoking.<ref name=":35" /> Only a fraction of individuals with microhematuria are diagnosed with a urologic cancer.<ref name=":35" /> When asymptomatic populations are screened with dipstick and/or microscopy medical testing about 2% to 3% of those with hematuria have a urologic [[Malignancies|malignancy]].<ref name=":35" /> Routine screening is not recommended.<ref name=":35" /><ref name="Ingelfinger 2021" /> Individuals with risk factors who undergo repeated testing have higher rates of urologic malignancies.<ref name=":35" /> These risks factors include age (> 40 years), male gender, previous or current smoking, chemical exposure (e.g., [[benzene]]s, [[hydrocarbons]], [[aromatic amine]]s), history of chemotherapy ([[alkylating agents]], [[ifosfamide]]), prolonged foreign body in the bladder (such as a [[bladder catheter]]), prior pelvic [[radiation therapy]], or greater than 25 red blood cells per high powered field on urine microscopy.<ref name=":35" /><ref name="Ingelfinger 2021" /> |
||
The prevalence of microscopic hematuria in [[North Africa]] is very high due to the high prevalence of the blood fluke [[schistosoma haematobium]], which chronically infects the urinary tract.<ref name="Ingelfinger 2021" /> |
|||
In pediatric populations, the prevalence is 0.5–2%.<ref name=":22">{{Cite book|last1=Shah|first1=Samir|title=Step-up to pediatrics|publisher=Wolters Kluwer/Lippincott Williams & Wilkins|last2=Ronan |first2=Jeanine C. |last3=Alverson |first3=Brian|year=2014|isbn=978-1451145809|edition=first|location=Philadelphia|pages=175–176|oclc=855779297}}</ref> Risks factor include older age and female gender.<ref name=":02">{{Cite journal|last1=Cohen|first1=Robert A.|last2=Brown|first2=Robert S.|date=2003-06-05|title=Clinical practice. Microscopic hematuria|journal=The New England Journal of Medicine|volume=348|issue=23|pages=2330–2338|doi=10.1056/NEJMcp012694|issn=1533-4406|pmid=12788998}}</ref> About 5% of individuals with microscopic hematuria receive a cancer diagnosis. 40% of individuals with macroscopic hematuria (blood easily visible in the urine) receive a cancer diagnosis.<ref name=":12">{{Cite journal|last1=Sharp|first1=Victoria|last2=Barnes|first2=Kerri D.|last3=Erickson|first3=Bradley D.|date=December 1, 2013|title=Assessment of Asymptomatic Microscopic Hematuria in Adults|url=https://www.aafp.org/afp/2013/1201/p747.html|journal=American Family Physician|volume=88|issue=11|pages=747–754|pmid=24364522}}</ref> |
In pediatric populations, the prevalence is 0.5–2%.<ref name=":22">{{Cite book|last1=Shah|first1=Samir|title=Step-up to pediatrics|publisher=Wolters Kluwer/Lippincott Williams & Wilkins|last2=Ronan |first2=Jeanine C. |last3=Alverson |first3=Brian|year=2014|isbn=978-1451145809|edition=first|location=Philadelphia|pages=175–176|oclc=855779297}}</ref> Risks factor include older age and female gender.<ref name=":02">{{Cite journal|last1=Cohen|first1=Robert A.|last2=Brown|first2=Robert S.|date=2003-06-05|title=Clinical practice. Microscopic hematuria|journal=The New England Journal of Medicine|volume=348|issue=23|pages=2330–2338|doi=10.1056/NEJMcp012694|issn=1533-4406|pmid=12788998}}</ref> About 5% of individuals with microscopic hematuria receive a cancer diagnosis. 40% of individuals with macroscopic hematuria (blood easily visible in the urine) receive a cancer diagnosis.<ref name=":12">{{Cite journal|last1=Sharp|first1=Victoria|last2=Barnes|first2=Kerri D.|last3=Erickson|first3=Bradley D.|date=December 1, 2013|title=Assessment of Asymptomatic Microscopic Hematuria in Adults|url=https://www.aafp.org/afp/2013/1201/p747.html|journal=American Family Physician|volume=88|issue=11|pages=747–754|pmid=24364522}}</ref> |
||
Latest revision as of 09:17, 19 October 2024
| Hematuria | |
|---|---|
| Other names | Haematuria, erythrocyturia, blood in the urine |
 | |
| Visible hematuria that is tea-colored | |
| Specialty | Nephrology, Urology |
| Symptoms | Blood in the urine |
| Causes | Urinary tract infection, kidney stone, bladder cancer, kidney cancer |
Hematuria or haematuria is defined as the presence of blood or red blood cells in the urine.[1] "Gross hematuria" occurs when urine appears red, brown, or tea-colored due to the presence of blood. Hematuria may also be subtle and only detectable with a microscope or laboratory test.[2] Blood that enters and mixes with the urine can come from any location within the urinary system, including the kidney, ureter, urinary bladder, urethra, and in men, the prostate.[3] Common causes of hematuria include urinary tract infection (UTI), kidney stones, viral illness, trauma, bladder cancer, and exercise.[4] These causes are grouped into glomerular and non-glomerular causes, depending on the involvement of the glomerulus of the kidney.[1] But not all red urine is hematuria.[5] Other substances such as certain medications and foods (e.g. blackberries, beets, food dyes) can cause urine to appear red.[5] Menstruation in women may also cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.[6] A urine dipstick test may also give an incorrect positive result for hematuria if there are other substances in the urine such as myoglobin, a protein excreted into urine during rhabdomyolysis. A positive urine dipstick test should be confirmed with microscopy, where hematuria is defined by three or more red blood cells per high power field.[6] When hematuria is detected, a thorough history and physical examination with appropriate further evaluation (e.g. laboratory testing) can help determine the underlying cause.[1]
Differential diagnosis
[edit]
Hematuria can be classified according to visibility, anatomical origin, and timing of blood during urination.[1][6]
- In terms of visibility, hematuria can be visible to the naked eye (termed "gross hematuria") and may appear red or brown (sometimes referred to as tea-colored), or it can be microscopic (i.e. not visible but detected with a microscope or laboratory test).[2][6] Microscopic hematuria is present when there are three or more red blood cells per high power field.[3]
- In terms of the anatomical origin, blood or red blood cells can enter and mix with urine at multiple anatomical sites within the urinary system, including the kidney, ureter, urinary bladder, and urethra, and in men, the prostate.[1] Additionally, menstruation in women may cause the appearance of hematuria and may result in a positive urine dipstick test for hematuria.[3] The causes corresponding to these anatomic locations can be divided into glomerular and non-glomerular causes, referring to the involvement of the glomerulus of the kidney.[4] Non-glomerular causes can be further subdivided into the upper urinary tract and lower urinary tract causes.[1]
- In terms of the timing during urination, hematuria can be initial, terminal or total, meaning blood can appear in the urine at the onset, midstream, or later.[1][5] If it appears soon after the onset of urination, a distal site is suggested.[5] A longer delay suggests a more proximal lesion.[5] Hematuria that occurs throughout urination suggests that bleeding is occurring above the level of the bladder.[5]
Many causes may present as either visible hematuria or microscopic hematuria, and so the differential diagnosis is frequently organized based on glomerular and non-glomerular causes.[4][6]
Glomerular hematuria
[edit]
Hematuria due to a glomerular source commonly presents as dysmorphic red blood cells (misshapen red blood cells) or red cell casts (small tubular structures made up of red blood cell components) on urine microscopy. This occurs due to the red blood cells being deformed as they pass through the glomerular capillaries into the renal tubules and eventually into the urinary system.[7] Normally, red blood cells should never pass from the glomerular capillary into the renal tubule, and this is always a pathological process. Glomerular causes include:
- IgA nephropathy[4]
- Thin glomerular basement membrane disease[4]
- Hereditary nephritis (Alport's disease)[6]
- Hemolytic uremic syndrome[6]
- Postinfectious glomerulonephritis[4] (group A β-hemolytic streptococcus pyogenes)
- Membranoproliferative glomerulonephritis[4]
- Lupus nephritis[4]
- Henoch–Schönlein purpura[6]
- Nephritic syndrome[8]
- Nephrotic syndrome[4]
- Polycystic kidney disease[4]
- Idiopathic hematuria[9]
Non-glomerular hematuria
[edit]Visible blood clots in the urine indicate a non-glomerular cause.[6] Non-glomerular causes include:
- Urinary tract infections, such as pyelonephritis, cystitis, prostatitis, and urethritis[4][6]
- Kidney stones[4]
- Cancers, such as renal cell carcinoma and bladder cancer (particularly transitional cell carcinoma), and in men, prostate cancer[4]
- Urinary tract strictures[6]
- Benign prostatic hyperplasia[6]
- Renal papillary necrosis[6]
- Trauma or damage to the lining of the urinary tract[4]
- Intense exercise[4]
- Increased tendency to bleed due to acquired or genetic conditions (e.g. sickle cell disease or vitamin K deficiency bleeding) or certain medications (e.g. blood thinners)[4][6]
Mimickers of hematuria
[edit]Pigmenturia
[edit]Not all red or brown urine is caused by hematuria.[3] Other substances such as certain medications and certain foods can cause urine to appear red.[3]
Medications that may cause urine to appear red include:
Foods that may cause urine to appear red include:
- Blackberries[6]
- Food dyes.[6]
- Beets[3]
- Rhubarb[3]
- Fava beans[10]
False positive urine dipstick
[edit]A urine dipstick may be falsely positive for hematuria due to other substances in the urine.[6] While the urine dipstick test is able to recognize heme in red blood cells, it also identifies free hemoglobin and myoglobin.[6] Free hemoglobin may be found in the urine resulting from hemolysis, and myoglobin may be found in the urine resulting from rhabdomyolysis (muscle breakdown).[6][5] Thus, a positive dipstick test does not necessarily indicate hematuria; rather, microscopy of the urine showing three of more red blood cells per high power field confirms hematuria.[6][3]
Menstruation
[edit]In women, menstruation may cause the appearance of hematuria and may result in a urine dipstick test positive for hematuria.[3] Menstruation can be ruled out as a cause of hematuria by inquiring about menstruation history and ensuring the urine specimen is collected without menstrual blood.[3]
In children
[edit]Common causes of hematuria in children[11] are:[12]
- Fever
- Strenuous exercise
- Acute nephritis
- Congenital abnormalities:
- Non-vascular: ureteropelvic junction obstruction, posterior urethral valves, urethral prolapse, urethral diverticulum and multicystic dysplastic kidney
- Vascular: arteriovenous malformations, hereditary hemorrhagic telangiectasias, renal vein thrombosis in newborns.
- Urinary stones.
- Coagulation disorders.
- Mechanical trauma: masturbation, foreign body.
- Nephritic syndrome: IgA nephropathy, Post-streptococcal glomerulonephritis, Benign familial hematuria, Alport syndrome.
- Sickle cell trait or disease.
Evaluation
[edit]The evaluation of hematuria is dependent upon the visibility of the blood in the urine (i.e. visible/gross vs microscopic hematuria).[6] Visible hematuria must be investigated, as it may be due to a pathological cause.[1][6] In those with visible hematuria, urological cancer (most frequently bladder or kidney cancer) is discovered in 20–25%.[3] Hematuria alone without accompanying symptoms should be raise suspicion of malignancy of the urinary tract until proven otherwise.[5] The initial evaluation of patients presenting with signs and symptoms that are consistent of hematuria include assessment of hemodynamic status, underlying cause of hematuria, and ensuring urinary drainage. These steps include assessment of the patient's heart rate, blood pressure, a physician exam taken by a healthcare professional, and blood work to ensure the patient's hemodynamic status is adequate.[13] It is important to obtain a detailed history from the patient (i.e. recreational, occupational, and medication exposures) as this information can be helpful in suggesting a cause of hematuria.[14] The physical exam can also be helpful in identifying a cause of the hematuria as certain signs found on the physical exam can suggest specific causes of the hematuria.[14] In the event the initial evaluation of hematuria does not reveal an underlying cause then evaluation by a physician who specializes in Urology may proceed. This medical evaluation may consist of, but is not limited too, a history and physical exam taken by healthcare personnel, laboratory studies (i.e. blood work), cystoscopy, and specialized imaging procedures (i.e. CT or MRI).[13]
Visible hematuria
[edit]The first step in evaluation of red or brown colored urine is to confirm true hematuria with urinalysis and urine microscopy, where hematuria is defined by three of more red blood cells per high power field.[3] Although a urine dipstick test may be used, it can give false positive or false negative results.[4] In gathering information, it is important to inquire about recent trauma, urologic procedures, menses, and culture-documented urinary tract infection.[3] If any of these are present, it is appropriate to repeat a urinalysis with urine microscopy in 1 to 2 weeks or after treatment of the infection.[6][3] If the results of the urinalysis and urine microscopy reveal a glomerular origin of hematuria (indicated by proteinuria or red blood cell casts), consultation with a nephrologist should be made.[6] If the results of the urinalysis indicate a non-glomerular origin, a microbiological culture of the urine should be performed, if it has not been done already.[6] If the culture is positive (indicating a bladder infection), urinalysis and urine microscopy should be repeated following treatment to confirm resolution of the hematuria.[6] If the culture is negative or if hematuria persists after treatment, CT urogram or renal ultrasound and cystoscopy should be performed.[6][7] Hemodynamic stability should be monitored and a complete blood count should be ordered to assess for anemia.[3]
Microscopic hematuria
[edit] | This section needs to be updated. (March 2023) |
After detecting and confirming hematuria with urinalysis and urine microscopy, the first step in evaluation of microhematuria is to rule out benign causes.[15] Benign causes include urinary tract infection, viral illness, kidney stone, recent intense exercise, menses, recent trauma, or recent urological procedure.[15] After benign causes have resolved or been treated, a repeat urinalysis and urine microscopy is warranted to ensure cessation of hematuria.[15] If hematuria persists (even if there is a suspected cause), the next step is to stratify the risk of the person for urothelial cancer into low, intermediate, or high risk to determine next steps.[16] To be in the low risk category, one must satisfy all of the following criteria: Has never smoked tobacco or smoked less than 10 pack-years; is a female less than 50 years old or a male less than 40 years old; has 3–10 red blood cells per high power field; has not had microscopic hematuria before; and has no other risk factors for urothelial cancer.[16] To be in the intermediate risk category, one must satisfy any of the following criteria: Has smoked 10–30 pack-years; is a female 50–59 years old or a male aged 40–59 years old; has 11–25 red blood cells per high power field; or was previously a low-risk patient with persistent microscopic hematuria and has 3–25 red blood cells per high power field.[16] To be in the high risk category, one must satisfy any of the following criteria: Has smoked more than 30 pack-years; is older than 60 years of age; or has above 25 red blood cells per high power field on any urinalysis.[16] For the low risk category, the next step is to either repeat a urinalysis with urine microscopy in 6 months or perform a cystoscopy and renal ultrasound.[16] For the intermediate risk category, the next step is to perform a cystoscopy and renal ultrasound.[16] For the high risk category, the next step is to perform a cystoscopy and CT urogram.[16] If an underlying cause for hematuria is discovered, it should be managed appropriately.[16] However, if no underlying cause is discovered, the hematuria should be re-evaluated with urinalysis and urine microscopy within 12 months.[16] Additionally, for all risk categories, if a nephrologic origin is suspected, consultation of a nephrologist should be made.[16]
Pathophysiology
[edit]The pathophysiology of hematuria can often be explained by damage to the structures of the urinary system, including the kidney, ureter, urinary bladder, and urethra, and in men, the prostate.[4][1] Common mechanisms include structural disruption to the glomerular basement membrane and mechanical or chemical erosion of the mucosal surfaces of the genitourinary tract.[4]
Management
[edit]Medical emergency: acute clot retention
[edit]
- Fill syringe with saline.
- Connect syringe to a catheter port.
- Instill 180cc of saline.
- Draw back 180cc of bladder urine.
- Dispose of medical waste.
- Repeat until all clots are removed.
Acute clot retention is one of three emergencies that can occur with hematuria.[17] The other two are anemia and shock.[17] Blood clots can prevent urine outflow through either ureter or the bladder.[17] This is known as acute urinary retention.
Blood clots that remain in the bladder are digested by urinary urokinase producing fibrin fragments.[17] These fibrin fragments are natural anticoagulants and promote ongoing bleeding from the urinary tract.[17] Removing all blood clots prevents the formation of this natural anticoagulant.[17] This in turns facilitates the cessation of bleeding from the urinary tract.[17]
The acute management of obstructing clots is the placement of a large (22–24 French) urethral Foley catheter.[17] Clots are evacuated with a Toomey syringe and saline irrigation.[17] If this does not control the bleeding, management should escalate to continuous bladder irrigation (CBI) via a three-port urethral catheter.[17] If both a large urethral Foley catheter and CBI fail, an urgent cystoscopy in the operating room will be necessary.[17] Lastly, a transfusion and/or a correction of a coexisting coagulopathy may be necessary.[17]
Medical emergency: urosepsis
[edit]Urosepsis is defined as sepsis caused by a urogenital tract infection and comprises about 25% of all sepsis cases.[18] Urosepsis is the result of a systemic inflammatory response to infection and can be identified by numerous signs and symptoms (e.g. fever, hypothermia, tachycardia, and leukocytosis).[18] Signs and symptoms that indicate a urogential tract infection is the source of the sepsis may include, but are not limited to, flank pain, costovertebral angle tenderness, pain with micturition, urinary retention, and scrotal pain.[18] In terms of the visibility, hematuria can be visible to the naked eye (termed "gross hematuria") and may appear red or brown (sometimes referred to as tea-colored), or it can be microscopic (i.e. not visible to the eye but detected of urosepsis.[18] In addition to imaging tests, patients may be treated with antibiotics to relieve the infection and intravenous fluids to maintain cardiovascular and renal perfusion.[18] Acute management of hemodynamic status, in the event intravenous fluids are unsuccessful, may include the use of vasopressor medications and the placement of a central venous line.[18]
Epidemiology
[edit]In the United States, microscopic hematuria has a prevalence of somewhere between 2% and 31%.[19][7] Higher rates exist in individuals older than 60 years of age and those with a current or prior history of smoking.[19] Only a fraction of individuals with microhematuria are diagnosed with a urologic cancer.[19] When asymptomatic populations are screened with dipstick and/or microscopy medical testing about 2% to 3% of those with hematuria have a urologic malignancy.[19] Routine screening is not recommended.[19][7] Individuals with risk factors who undergo repeated testing have higher rates of urologic malignancies.[19] These risks factors include age (> 40 years), male gender, previous or current smoking, chemical exposure (e.g., benzenes, hydrocarbons, aromatic amines), history of chemotherapy (alkylating agents, ifosfamide), prolonged foreign body in the bladder (such as a bladder catheter), prior pelvic radiation therapy, or greater than 25 red blood cells per high powered field on urine microscopy.[19][7]
The prevalence of microscopic hematuria in North Africa is very high due to the high prevalence of the blood fluke schistosoma haematobium, which chronically infects the urinary tract.[7]
In pediatric populations, the prevalence is 0.5–2%.[20] Risks factor include older age and female gender.[21] About 5% of individuals with microscopic hematuria receive a cancer diagnosis. 40% of individuals with macroscopic hematuria (blood easily visible in the urine) receive a cancer diagnosis.[22]
References
[edit]- ^ a b c d e f g h i Papadakis, Maxine A.; McPhee, Stephen J.; Rabow, Michael W. (14 September 2021). Current medical diagnosis & treatment 2022. McGraw-Hill Education. 23-02: Hematuria. ISBN 978-1-264-26938-9. OCLC 1268130534.
- ^ a b Kirkpatrick, Wanda G. (1990), "Chapter 184 – Hematuria", in Walker, H. Kenneth; Hall, W. Dallas; Hurst, J. Willis (eds.), Clinical Methods: The History, Physical, and Laboratory Examinations (3rd ed.), Boston: Butterworths, ISBN 978-0-409-90077-4, PMID 21250137, retrieved 2022-01-17
- ^ a b c d e f g h i j k l m n o Partin, Alan W.; Dmochowski, Roger R.; Kavoussi, Louis R.; Peters, Craig, eds. (2021). "Evaluation and Management of Hematuria". Campbell-Walsh-Wein urology (Twelfth ed.). Philadelphia, Pennsylvania. ISBN 978-0-323-54642-3. OCLC 1130700336.
{{cite book}}: CS1 maint: location missing publisher (link) - ^ a b c d e f g h i j k l m n o p q r s Saleem, Muhammad O.; Hamawy, Karim (2022), "Hematuria", StatPearls, Treasure Island, Florida: StatPearls Publishing, PMID 30480952, retrieved 2022-01-17
- ^ a b c d e f g h McAninch, Jack W.; Lue, Tom (2013). "Chapter 3: Symptoms of Disorders of the Genitourinary Tract". Smith & Tanagho's General Urology. McGraw-Hill Education.
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae Stern, Scott D. C. Symptom to diagnosis: an evidence-based guide. Chapter 21-1: Approach to the Patient with Hematuria – Case 1. OCLC 1121597721.
- ^ a b c d e f Ingelfinger, Julie R. (8 July 2021). "Hematuria in Adults". New England Journal of Medicine. 385 (2): 153–163. doi:10.1056/NEJMra1604481. PMID 34233098.
- ^ Hashmi, Mydah S.; Pandey, Jyotsna (2022), "Nephritic Syndrome", StatPearls, Treasure Island, Florida: StatPearls Publishing, PMID 32965911, retrieved 2022-01-19
- ^ Izzo, Joseph L.; Sica, Domenic A.; Black, Henry Richard (2008). Hypertension Primer. Lippincott Williams & Wilkins. p. 382. ISBN 978-0-7817-8205-0.
- ^ "Changes in Urine; Symptoms, Causes & Treatment". Cleveland Clinic. Retrieved 2022-09-12.
- ^ "Hematuria in Children". National Kidney Foundation. 2015-12-24. Retrieved 2023-03-11.
- ^ Pade, Kathryn H.; Liu, Deborah R. (September 2014). "An evidence-based approach to the management of hematuria in children in the emergency department". Pediatric Emergency Medicine Practice. 11 (9): 1–13, quiz 14. ISSN 1549-9650. PMID 25296518.
- ^ a b Avellino, Gabriella J.; Bose, Sanchita; Wang, David S. (June 2016). "Diagnosis and Management of Hematuria". Surgical Clinics of North America. 96 (3): 503–515. doi:10.1016/j.suc.2016.02.007. PMID 27261791.
- ^ a b Yun, Edward J.; Meng, Maxwell V.; Carroll, Peter R. (March 2004). "Evaluation of the patient with hematuria". Medical Clinics of North America. 88 (2): 329–343. doi:10.1016/S0025-7125(03)00172-X. PMID 15049581.
- ^ a b c Davis, Rodney; Jones, J. Stephen; Barocas, Daniel A.; Castle, Erik P.; Lang, Erich K.; Leveillee, Raymond J.; Messing, Edward M.; Miller, Scott D.; Peterson, Andrew C.; Turk, Thomas M. T.; Weitzel, William (2012-12-01). "Diagnosis, Evaluation and Follow-Up of Asymptomatic Microhematuria (AMH) in Adults: AUA Guideline". Journal of Urology. 188 (6S) (published 2012): 2473–2481. doi:10.1016/j.juro.2012.09.078. PMID 23098784.
- ^ a b c d e f g h i j Barocas, Daniel A.; Boorjian, Stephen A.; Alvarez, Ronald D.; Downs, Tracy M.; Gross, Cary P.; Hamilton, Blake D.; Kobashi, Kathleen C.; Lipman, Robert R.; Lotan, Yair; Ng, Casey K.; Nielsen, Matthew E. (2020-10-01). "Microhematuria: AUA/SUFU Guideline". Journal of Urology. 204 (4): 778–786. doi:10.1097/JU.0000000000001297. PMID 32698717. S2CID 220717643.
- ^ a b c d e f g h i j k l Kaplan, Damara; Kohn, Taylor. "Urologic Emergencies: Gross Hematuria with Clot Retention". American Urological Association. Archived from the original on 2019-11-28. Retrieved 2019-12-11.
- ^ a b c d e f Wagenlehner, Florian M. E.; Lichtenstern, Christoph; Rolfes, Caroline; Mayer, Konstantin; Uhle, Florian; Weidner, Wolfgang; Weigand, Markus A. (June 2013). "Diagnosis and management for urosepsis: Items in urosepsis". International Journal of Urology. 20 (10): 963–970. doi:10.1111/iju.12200. PMID 23714209.
- ^ a b c d e f g Coplen, D. E. (January 2013). "Diagnosis, Evaluation and Follow-Up of Asymptomatic Microhematuria (AMH) in Adults: AUA Guideline". Yearbook of Urology. 2013: 1–2. doi:10.1016/j.yuro.2013.07.019. ISSN 0084-4071.
- ^ Shah, Samir; Ronan, Jeanine C.; Alverson, Brian (2014). Step-up to pediatrics (first ed.). Philadelphia: Wolters Kluwer/Lippincott Williams & Wilkins. pp. 175–176. ISBN 978-1451145809. OCLC 855779297.
- ^ Cohen, Robert A.; Brown, Robert S. (2003-06-05). "Clinical practice. Microscopic hematuria". The New England Journal of Medicine. 348 (23): 2330–2338. doi:10.1056/NEJMcp012694. ISSN 1533-4406. PMID 12788998.
- ^ Sharp, Victoria; Barnes, Kerri D.; Erickson, Bradley D. (December 1, 2013). "Assessment of Asymptomatic Microscopic Hematuria in Adults". American Family Physician. 88 (11): 747–754. PMID 24364522.
External links
[edit]
Media related to Hematuria at Wikimedia Commons
