Blood in the urine (haematuria): what it means and what tests you need

What blood in the urine means

Haematuria simply means red blood cells in the urine. There are two types, and the distinction matters.

Visible (macroscopic) haematuria is when you can see the change yourself — pink, red, brown, or tea-coloured urine, sometimes with clots. It is usually painless. It is the kind that brings people to the GP quickly, and it should.

Non-visible (microscopic) haematuria is when the urine looks normal but a dipstick test or microscopy shows red blood cells. It is often picked up incidentally during a check-up, an insurance medical, or a urine test for something else.

The first thing to understand is that both types are taken seriously in adults, even when they cause no symptoms. Bleeding from the urinary tract — kidneys, ureters, bladder, prostate, or urethra — is not a normal finding. Most of the time the cause turns out to be benign, but the workup exists to identify the small number of people whose haematuria is the first sign of bladder, kidney, or upper-tract cancer.

In the Bladder Cancer Optimal Care Pathway, endorsed by the NHMRC and Cancer Council Australia, visible haematuria in an adult over 40 carries a roughly 20 to 30 percent chance of being associated with a urological cancer. That is not a reason to panic — it is the reason every Australian guideline (RACGP, USANZ, and eTG) treats visible haematuria as a “do not delay” event.

A few important points before we go further:

• Even one episode counts. Bladder cancer often bleeds intermittently. A single pink-urine event followed by weeks of clear urine does not rule out a serious cause.
• Painless haematuria is the more concerning pattern. Pain usually points to infection or stones; painlessness points more toward a structural cause that needs imaging.
• Anticoagulants do not explain it away. People on blood thinners who develop haematuria still need a full workup — the medication often unmasks an underlying lesion rather than causing the bleeding itself.

Common and uncommon causes

The full differential covers the entire urinary tract from kidney to urethra, plus some systemic conditions. Here is the practical hierarchy.

Urinary tract infection

The most common cause overall in general practice. A bladder infection (cystitis) inflames the bladder lining and can cause microscopic — sometimes visible — bleeding alongside the classic symptoms of burning, frequency, and urgency. After antibiotic treatment, a repeat urine test is essential. If the haematuria persists once the infection has cleared, a deeper workup is required. Treating UTI and assuming the haematuria is “just the infection” is one of the most common reasons cancer diagnoses are delayed.

Kidney and bladder stones

Stones grind against the lining of the urinary tract and bleed. Kidney stones classically cause severe loin-to-groin pain (renal colic), but smaller stones in the kidney can produce microscopic haematuria with no pain at all. A CT scan diagnoses stones easily.

Benign prostatic hyperplasia (enlarged prostate)

Common in men over 50. An enlarged prostate has dilated blood vessels on its surface that can bleed, especially after exertion or straining. Symptoms of poor urinary stream, dribbling, hesitancy, and nocturia point this direction. Even when prostate enlargement is the suspected cause, men still need imaging and often a cystoscopy to be sure nothing else is contributing.

Glomerular (kidney inflammation) causes

When the tiny filters inside the kidneys (glomeruli) inflame, red blood cells leak into the urine along with protein. Common patterns include IgA nephropathy (often triggered by a sore throat or upper respiratory infection), thin basement membrane disease (a benign familial form), and lupus nephritis. The give-aways on urine testing are red blood cell casts, dysmorphic (oddly shaped) red blood cells, protein in the urine, and any rise in blood pressure or kidney-function blood tests. These need specialist nephrology input. Kidney Health Australia has clear patient resources on glomerular disease.

Urological cancer

The cause we are most carefully ruling out. Bladder cancer is the fourth most common cancer in Australian men. The main risk factors are age over 40, smoking (current or former — smoking is implicated in roughly half of bladder cancers), and occupational exposure to aniline dyes, aromatic amines, and polycyclic aromatic hydrocarbons. Industries to mention to your GP include rubber, leather, hairdressing, painting, dye manufacture, and historical chemical exposure including for Vietnam veterans. Kidney cancer (renal cell carcinoma) and upper-tract urothelial cancer are less common but follow similar risk patterns.

Less common contributors

These include schistosomiasis (a parasitic infection acquired in sub-Saharan Africa and parts of the Middle East — important in refugee health), tuberculosis affecting the urinary tract, sickle cell trait, vigorous exercise (transient bleeding that resolves), recent catheter placement, intercourse-related trauma, and endometriosis affecting the bladder in women (cyclical bleeding tracking with the menstrual cycle).

How your GP investigates

The workup is the same regardless of which cause is suspected, because the job is to find — or exclude — every plausible explanation. eTG and the RACGP guidance frame the approach as follows.

First — confirm it is really blood

A urine sample is sent for microscopy. This confirms the presence of red blood cells and excludes look-alikes such as muscle-pigment (myoglobin) release, free haemoglobin from a blood disorder, and food or drug discolouration. The lab also looks for red cell casts (which point toward a kidney filter problem), white cells (infection), and any abnormal cells.

Treat any UTI, then recheck

If the urine grows an organism, your GP treats the infection with appropriate antibiotics and then arranges a repeat urine test about six weeks later. If blood is still present once the infection is gone, the workup moves to the next step. Skipping the recheck is a recognised error.

Blood tests

Standard panel includes kidney function (urea, creatinine, eGFR) and a urine albumin-to-creatinine ratio to look for protein leakage. Full blood count and coagulation tests are added when the bleeding is heavy. If a glomerular cause is suspected, autoimmune panels (ANA, ANCA, complement levels) and other specialist tests are added.

Imaging

For adults over 40 with visible haematuria, or anyone with persistent microscopic haematuria plus risk factors, the preferred first scan is a CT urogram — a CT scan of the kidneys, ureters, and bladder using intravenous contrast and timed so the kidneys, the drainage system, and the bladder are all imaged clearly. It is the most sensitive scan for picking up upper-tract tumours and stones.

A renal tract ultrasound is used in pregnancy, in younger lower-risk patients, and where iodine contrast is contraindicated. It is safer but less sensitive for small ureteric and upper-tract lesions, so it is not interchangeable with a CT urogram in higher-risk patients.

A MR urogram is an alternative when both CT contrast and standard imaging carry concerns.

Cystoscopy — referral to a urologist

The final piece for the lower urinary tract is flexible cystoscopy: a urologist passes a thin flexible camera through the urethra into the bladder under local anaesthetic to inspect the lining directly. It is an outpatient procedure, takes a few minutes, and is the only reliable way to see early bladder cancer that imaging can miss. This is why visible haematuria in any adult over 40 prompts a urology referral, regardless of how the imaging looks.

When to see your GP

Make an appointment in the next few days if:

• You see blood in your urine, even once, even briefly, even painlessly
• A urine test (perhaps done for something else) has shown microscopic blood
• You have new burning, frequency, or urgency that does not settle in a day or two
• You notice loin or back pain with any change in your urine
• You are on blood thinners and notice any pink discolouration of urine — do not assume the medication is the explanation

Tell your GP about smoking history (current and former), occupational exposure to dyes or solvents over the years, recent overseas travel or refugee background, any family history of kidney disease or urological cancer, and all current medications including blood thinners and supplements.

Red flags — seek urgent review the same day

Go to an emergency department, or contact your GP urgently, if you have:

• Heavy visible bleeding with clots, or being unable to pass urine due to clots blocking the flow
• Visible blood in the urine and you are over 40 — this needs to be flagged the same day for urgent urological assessment under the Bladder Cancer Optimal Care Pathway
• Severe loin or flank pain with blood in the urine, especially with fever or vomiting (possible obstructed infected kidney)
• Blood in the urine with high blood pressure, leg swelling, or feeling unwell — possible acute kidney inflammation
• Blood in the urine with unintended weight loss, persistent tiredness, or a lump you can feel in the abdomen
• Painful inability to pass urine at all

Visible haematuria in an older adult is the classic “do not delay” presentation in Australian urology. The Optimal Care Pathway exists precisely so that people with this symptom are seen and scanned quickly.

What this article is and is not

This is general health information drawn from current Australian clinical guidelines — including the RACGP haematuria guidance, eTG Genitourinary, the NHMRC and Cancer Council Australia Bladder Cancer Optimal Care Pathway, USANZ, Kidney Health Australia, and consumer references at HealthDirect and Better Health Channel. International references from AUA and EAU are included where Australian guidance is silent.

This article is not personal medical advice and does not create a doctor–patient relationship. Decisions about investigations, referrals, and treatment are made with your own GP and any specialists involved in your care.

For acute medical concerns, contact your GP or your nearest emergency department.

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Sources cited

1. RACGP — Investigation of haematuria in adults
2. Therapeutic Guidelines — eTG complete: Genitourinary
3. NHMRC / Cancer Council Australia — Bladder Cancer Optimal Care Pathway
4. USANZ — Haematuria position statement
5. Kidney Health Australia — Glomerular disease and haematuria
6. HealthDirect — Blood in urine
7. Better Health Channel — Haematuria
8. AUA / SUO — Microhematuria guideline (2020)
9. EAU — Non-muscle invasive bladder cancer