HAEMATURIA

✓ Medically ReviewedSIGNID: MDBT0080🚨 TRIAGE: URGENTICD-10: R31

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Definition

CLINICAL DEFINITION

Haematuria is blood in urine from the urinary tract (kidneys, ureters, bladder, prostate or urethra). It may be visible (red or brown urine) or non-visible (dipstick positive with red cells on microscopy). Glomerular bleeding (filter bleeding) often gives brown urine with protein and casts (tubular moulds). Lower tract bleeding often gives bright red urine with clots. It is a signpost, not a final diagnosis, and needs source hunt.

IN PLAIN ENGLISH

Haematuria means blood in your pee. Pee may look red, pink or brown. It may show only on a test strip. It can come from kidneys or bladder. Doctors must find where it comes from.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Haematuria is not haemoglobinuria (free haem pigment without red cells) or myoglobinuria (muscle pigment after crush injury). It is not beetroot or drug colouring without red cells on microscopy. It is not menstrual contamination (period blood mixing with urine) alone. It is not haematemesis (vomited gut blood) or haemoptysis (coughed lung blood). Confirm with microscopy and context.

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Word Breakdown

haem-

=blood

ur-

=urine

-ia

=condition

Literal Meaning: condition of blood in urine

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Abbreviations

RBC=Red blood cell - seen on urine microscopy as dysmorphic (misshapen) when from filters

UTI=Urinary tract infection - common cause with burning and frequency

BPH=Benign prostatic hyperplasia - enlarged prostate pressing the outlet in older men

CTU=CT urography - contrast scan of kidneys, ureters and bladder for tumour hunt

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Synonyms & Variants

Blood in urine›Hematuria›Bloody urine›

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Category-Specific Context

Haematuria is a Symptom because patients report red urine or labs flag blood. It signals urological (bladder and prostate), nephrological (kidney filter) or systemic disease. It needs amount, timing, clots and linked features recorded. Workup splits glomerular (filter) from lower tract sources and excludes cancer in at-risk adults.

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Clinical Context & Usage

CLINICAL SETTINGS

Primary CareEmergency DepartmentUrology ClinicNephrology ClinicOncology and Haematuria Clinic

USAGE & DOCUMENTATION NOTES

Use haematuria when dipstick blood with microscopy red cells or visible blood is confirmed. State visible versus non-visible, timing through the stream, clots and pain. Ask about smoking, jobs with dyes, stones, infection, trauma, travel, bleed drugs and family kidney disease. Examine pressure, oedema (swelling), prostate, flanks and genitals. Do not dismiss single visible bleeding without workup in smokers or older adults.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Bleeding follows vessel or filter break along the tract. Infection and stones ulcerate lining (surface layer) and rupture small vessels. Tumours grow fragile vessels that bleed with minor trauma. Enlarged prostate congests veins that rupture with straining. Glomerular injury (filter injury) lets red cells pass the barrier (filter wall) with protein. Clots can then block outflow and cause colic or retention.

PRIMARY CAUSES

Urinary tract infection and cystitis

Bacterial inflammation ulcerates bladder lining and ruptures surface vessels, causing painful bloody urine with frequency

Ureteric and bladder calculi

Stones scrape lining during passage and block flow, causing colicky pain with bright blood

Benign prostatic hyperplasia

Enlarged prostate congests surface veins that rupture with straining, causing painless bleeding with weak stream in older men

Bladder urothelial carcinoma

Tumour invades lining and grows fragile vessels that bleed painlessly, often with clots in smokers

Renal cell carcinoma and upper tract urothelial tumour

Tumour erodes kidney or ureter vessels and sheds blood into urine, sometimes with flank mass or pain

Glomerulonephritis including IgA nephropathy

Immune filter injury lets dysmorphic red cells and protein pass with casts, often with brown urine and swelling

Polycystic kidney disease and renal trauma

Cyst rupture or blunt injury tears vessels and releases blood into collecting spaces

Schistosoma haematobium infection in endemic areas

Parasite eggs inflame bladder wall and cause granulomas (immune lumps) that bleed with chronic scarring

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Drug-Induced Causes

💊 Warfarin ↗

Mechanism: Lowers clotting factors so minor urinary lesions bleed longer; it unmasks but does not alone create the lesion

→ Do not adjust alone; seek urgent review, check clotting and urine source, reverse only for active severe bleeding per protocol

💊 Direct oral anticoagulants including apixaban and rivaroxaban ↗

Mechanism: Block clot proteins so small vessel breaks in tract bleed freely; they raise bleed from any stone or tumour

→ Seek urgent care for visible bleeding, weigh clot risk before pausing, arrange same-day source hunt

💊 Antiplatelets including aspirin and clopidogrel ↗

Mechanism: Block platelet clumping so inflamed lining bleeds more; dual therapy raises risk further

→ Do not stop heart protection alone; urgent urology and medication review to balance stent risk with bleeding

💊 Cyclophosphamide and ifosfamide ↗

Mechanism: Acrolein metabolite injures bladder lining causing haemorrhagic cystitis (bleeding bladder inflammation) with diffuse bleeding

→ Stop or switch per oncology, hydrate, give mesna (bladder protector) per protocol, refer urology urgently for washout

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Epidemiology

Prevalence:Haematuria is common in primary and emergency care. Non-visible blood on testing is frequent and often benign. Visible bleeding is less common but more often important. Causes vary by age, smoking and region.

Age Group:All ages are affected with cause-specific peaks. Children and young adults more often have infection, stones or glomerular inflammation. Middle-aged and older adults carry higher tumour risk, especially with smoking. Older men often have prostatic bleeding.

Geographic Distribution:Haematuria occurs worldwide without major restriction. Bladder tumour patterns follow smoking and dye exposures. Schistosomal bleeding clusters where freshwater flukes are endemic. Stone bleeding follows heat and diet patterns.

Red Flags & Triage ★

TRIAGE LEVEL

🚨 URGENT

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Bladder cancer in smokers with painless visible bleeding
Upper tract tumour with flank pain and clots
Glomerulonephritis with brown urine, protein and rising creatinine
Infected obstruction with fever and loin pain
Clot retention with inability to void

URGENT EVALUATION TRIGGERS

Unable to pass urine with clots and lower belly pain
Heavy bleeding with dizziness, faint or low pressure
Fever with flank pain and bloody urine
Brown urine with swelling and rising creatinine
Visible bleeding in smokers or older adults needing fast-track referral

Contraindications & Precautions

CONTRAINDICATIONS

Do not attribute visible bleeding to anticoagulants alone without source hunt
Do not delay imaging or referral for persistent visible bleeding in smokers
Do not use NSAIDs with heavy bleeding and kidney injury without review

SPECIAL PRECAUTIONS

Review all blood thinners and NSAIDs at once
Correct dehydration and avoid nephrotoxins during workup
Advise smoking stop and dye exposure review
Repeat testing after menstruation, exercise and fever settle
Screen for pressure, protein and creatinine with every episode

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Clot retention with inability to pass urine
Anaemia from repeated or heavy loss
Ureteric obstruction by clots with colic
Acute kidney injury from obstruction or filter disease
Delayed tumour diagnosis when bleeding is dismissed

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Haemoptysis

Shares haem prefix and sounds alike but is coughed lung blood with frothy sputum, not red urine from the tract

Haematemesis

Shares visible blood wording but is vomited gut blood, often dark with food, not urine blood

Haemoglobinuria

Confused because dipstick is positive but microscopy shows no red cells, as pigment alone colours urine

Proteinuria

Often co-exists and shares urine testing but is protein leak signalling filter or tubular disease, not blood itself

CLINICAL DIFFERENTIAL DIAGNOSES (DDx)

Myoglobinuria after crush or statin injury

Key Distinguishing Feature: Tea-coloured urine with muscle pain and very high creatine kinase without red cells on microscopy

Beetroot, blackberry or drug colouring

Key Distinguishing Feature: Red urine after food or rifampicin with no red cells and normal microscopy

Menstrual contamination

Key Distinguishing Feature: Bleeding timed with periods with vaginal blood and clean repeat sample outside menses

Porphyria with red urine

Key Distinguishing Feature: Dark urine with belly pain and nerve features that darkens on standing without red cells

Exercise-induced transient haematuria

Key Distinguishing Feature: Bleeding after intense effort that clears within days with normal repeat tests and no protein

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Clinical Pearls

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Ask stream timing and clots to localise source. Initial blood favours urethra, terminal favours bladder neck or prostate, total favours bladder or upper tract.

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Check microscopy for misshapen red cells, protein and casts to spot filter bleeding. Lower tract bleeding lacks casts and needs tumour hunt.

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Do not blame thinners alone for visible bleeding. Hunt for tumour, stone and infection even when clotting is thin.

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Fast-track persistent visible bleeding in smokers and older adults to urology. Normal ultrasound does not exclude urothelial tumour.

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Recheck dipstick after periods, hard exercise and fever settle. Persistent non-visible blood with protein needs kidney review.

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Example Usage & SOAP

CLINICAL SENTENCE

""62-year-old smoker with painless visible blood in urine has haematuria needing urgent urology workup.""

IN A SOAP NOTE

S: 62-year-old man with 3 days painless red urine with small clots, no burning or fever, smoker. O: Temp 36.9C, BP 142/86, HR 82, RR 16, SpO2 98 percent on air, belly soft, prostate enlarged, urine dip blood 3 plus. A: Visible haematuria likely lower tract source for tumour hunt. P: Full blood count, creatinine, urine culture and microscopy, stop NSAIDs, review thinners, renal ultrasound plus CT urography and cystoscopy per pathway, smoking counsel.

DIFFERENTIAL DIAGNOSIS CONTEXT

Red urine after beetroot with clear microscopy favours colouring over true bleeding. Muscle pain with tea-coloured urine and no red cells favours myoglobinuria. Painless visible bleeding with clots in a smoker favours bladder tumour. Brown urine with protein and casts favours glomerular bleeding.

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Prognosis

SHORT-TERM OUTCOME

Short term course follows source and amount. Infection and stone bleeding often settle with cause care. Heavy bleeding with clots can block outflow within hours. Filter bleeding with rising creatinine needs urgent nephrology care.

LONG-TERM PROGNOSIS

Long term outlook follows the cause, not the bleed alone. Treated infection or stones often recover well. Tumour outlook depends on stage at detection. Persistent glomerular bleeding needs long kidney follow-up.

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References & Coding

ICD-10 DIAGNOSTIC CODE

R31

LITERATURE CITATIONS & GUIDELINES

[1]WHO ICD-10 R31 Unspecified haematuria

[2]European Association of Urology haematuria guidance

[3]American Urological Association microhaematuria guidance

[4]Harrisons Principles of Internal Medicine

MEDICAL DISCLAIMER — This content is intended for educational purposes and qualified healthcare professionals only. Always refer to current clinical diagnostic criteria, institutional protocols, and official guidelines. Medobo is not responsible for clinical decisions made based on this content.