Medically reviewed by Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

Blood in the urine — known medically as haematuria — is never something to ignore. Whether it appears visibly or is picked up on a urine test, it signals that something within the urinary system requires attention. Laboratory analysis can identify whether the blood is hemolyzed (broken-down red blood cells) or non-hemolyzed (intact red blood cells), which helps point to the likely cause.

What does blood in urine mean?

Blood in urine, medically known as haematuria, can stem from various causes. It may range from something relatively harmless, like exercise-induced haematuria, to more serious conditions, such as kidney disease or bladder cancer.

In the UK, haematuria is a common reason people visit their GP, with approximately 1 in 20 people experiencing it at some point in their lives. It’s crucial to note that even trace amounts of blood in urine should never be ignored, as it might be an early warning sign of underlying health issues.

Types of blood in urine

Blood in urine can present in two forms:

• Hemolyzed: This occurs when the red blood cells are broken down, and only their remnants are detected. Hemolyzed blood often points to systemic or non-localised causes, such as kidney issues or certain medications.
• Non-Hemolyzed: This form involves intact red blood cells, often indicating a localised issue within the urinary tract, such as infections or injuries.

Hemolyzed blood: A closer look

When blood cells break apart, their components mix with the urine, turning it a reddish or brownish hue. In many cases, you won’t notice this change because it requires microscopic examination to identify.

Common causes of hemolyzed blood

• Kidney disorders: Conditions such as glomerulonephritis or nephritis can cause red blood cell breakdown in the kidneys.
• Systemic illnesses: Autoimmune diseases like lupus or certain infections can trigger haemolysis.
• Medications: Some drugs, particularly those affecting the kidneys, may lead to hemolyzed blood in urine.
• Intense exercise: Vigorous physical activity can sometimes result in hemolyzed blood due to the strain it places on your body.

Is it dangerous?

Hemolyzed blood can indicate serious systemic health issues. While a single episode might not be cause for panic, repeated occurrences warrant further investigation. For example, chronic kidney conditions can lead to complications if left untreated.

Non-hemolyzed blood: What it indicates

Non-hemolyzed blood appears as whole red blood cells in the urine. This type is often easier to detect visually and can range in colour from pink to bright red, depending on the severity.

Common causes of non-hemolyzed blood

• Urinary Tract Infections (UTIs): A common issue, particularly among women in the UK. “Over 40% of women experience at least one UTI in their lifetime” with blood in urine being a frequent symptom.
• Bladder or kidney stones: Stones can irritate the lining of the urinary tract, leading to visible bleeding.
• Trauma: Any injury to the lower abdomen or groin area can result in bleeding in the urine.
• Cancer: Bladder or kidney cancers can sometimes present as non-hemolyzed blood in urine, particularly in individuals over 50.

How serious is it?

Non-hemolyzed blood often signals an issue within the urinary tract. While infections or stones are usually treatable, early detection of cancers can make a significant difference in outcomes.

How do you know which it is?

Determining whether blood in your urine is hemolyzed or non-hemolyzed typically requires laboratory analysis. A dipstick test can provide an initial indication, while a more detailed urinalysis can confirm the type and potential causes.

When to see a doctor

If you notice blood in your urine, seek medical advice immediately. Some warning signs to look out for include:

• Persistent or recurring blood in urine
• Pain or burning during urination
• Lower back or abdominal pain
• Dark urine accompanied by fatigue or swelling (potential kidney issues)

Your GP might refer you to a private urologist for further tests, such as imaging scans or a cystoscopy.

If you are in London and looking for specialist urology advice, Mr Maneesh Ghei offers private consultations at The Wellington Hospital, St John’s Wood. No GP referral is required and same-week appointments are usually available.

Clinical significance and next steps

The distinction between hemolyzed and non-hemolyzed haematuria gives useful diagnostic direction, but it does not change the clinical imperative: all haematuria requires investigation. Waiting for symptoms to pass is not appropriate, particularly in patients over 40 or with risk factors for bladder or kidney cancer. Prompt assessment — urine culture, imaging, and cystoscopy where indicated — gives the best chance of catching any serious underlying cause early.

Frequently Asked Questions

What is the difference between hemolyzed and non-hemolyzed blood in urine?

Hemolyzed blood means red blood cells have broken down and only their remnants appear in the urine — this often points to kidney or systemic conditions. Non-hemolyzed blood means intact red blood cells are present, which usually indicates a localised problem in the urinary tract such as an infection, stone or structural issue.

Which is worse: hemolyzed or non-hemolyzed blood in urine?

Neither is inherently worse. The severity depends entirely on the underlying cause. Hemolyzed blood can indicate kidney disease or systemic illness, while non-hemolyzed blood can range from a treatable UTI to bladder cancer. Both types require investigation to determine the cause and appropriate treatment.

Can blood in urine be a sign of cancer?

Yes. Bladder cancer and kidney cancer can both present with blood in the urine, often painlessly in the early stages. This is one of the reasons blood in urine should always be investigated, even if it clears up on its own. In older adults, painless visible blood in the urine is treated as a potential cancer sign until proven otherwise.

What does blood in urine look like?

Visible haematuria can make urine appear pink, red or brown depending on the amount of blood present. Microscopic haematuria is not visible to the naked eye and is only detected on a urine test. Even a small amount of blood can significantly change the colour of urine.

Does blood in urine always mean something serious?

Not always — common causes include UTIs, kidney stones and vigorous exercise, all of which are treatable. However, because blood in urine can also indicate cancer, kidney disease or other serious conditions, it should always be assessed by a doctor regardless of whether it clears up quickly.

When should I see a urologist for blood in urine?

See a urologist if blood in urine recurs, if there is no obvious cause such as a UTI, if you are over 40, or if it is accompanied by pain, weight loss or urinary changes. A private urologist can arrange a full assessment including urine tests, imaging and cystoscopy, with same-week availability.

Where can I see a private urologist in London?

Mr Maneesh Ghei is a consultant urological surgeon based at The Wellington Hospital, Platinum Medical Centre, St John’s Wood, London NW8 7JA. He covers kidney infections, kidney stones, urinary problems, and a wide range of urological conditions. Same-week appointments are available with no GP referral needed.

About the Author

Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

Mr Maneesh Ghei is a consultant urological surgeon with NHS and private practice across four London hospitals. He specialises in the diagnosis and management of kidney infections, urinary tract conditions, kidney stones, prostate conditions, and male sexual health. Mr Ghei sees new patients privately with same-week availability. No GP referral is required. Book a private urology consultation.