Blood in Urine on a Test: What Does Microscopic Hematuria Mean?

Anthony Ofori | Medical Graduate in General Medicine | Founder, WellNest Central
Last updated: 24 September 2026

Your urine looks normal, but the laboratory report says “blood: trace” or “red blood cells present.” It is understandable to worry about your kidneys. What does a blood in urine test actually tell you, and what should happen next?

A positive screening result deserves follow-up, but it does not by itself reveal the cause. The first step is to find out whether red blood cells are really present in a properly collected urine sample. From there, your symptoms and the rest of your results guide the next steps.

What is microscopic hematuria?

Hematuria means blood in the urine. When you can see pink, red or brown urine, clinicians call it visible or gross hematuria. Microscopic hematuria means the urine looks ordinary, but red blood cells are detected during testing.

As the NIDDK explains, blood may originate anywhere along the urinary tract, including the kidneys, ureters, bladder or urethra. A urine result alone cannot locate the source.

Why a dipstick result needs confirmation

Many urine tests begin with a dipstick: a strip that changes colour in response to substances in the sample. It is a useful screening tool, but a positive “blood” square is not the same thing as red blood cells seen under a microscope. The National Kidney Foundation advises confirming a positive strip with microscopic examination.

Ask whether your report includes a microscopic red blood cell result, often written as RBC/HPF (red blood cells per high-power field). The number and its interpretation depend on the laboratory and your situation. A result from a home strip should also be reviewed with a healthcare professional rather than treated as a diagnosis.

Collection matters. Menstrual blood can enter a sample, and strenuous exercise may be associated with temporary hematuria. Tell your clinician if either applied. They may suggest a properly collected repeat sample at a suitable time. Do not simply assume those factors explain persistent blood or a new episode of visibly red urine.

Does blood in urine mean kidney disease?

Not necessarily. Common possibilities include a urinary tract infection, a kidney or bladder stone, inflammation, or an enlarged prostate. Kidney-filter diseases can also cause blood in urine. Less commonly, a cancer in the urinary tract may be responsible. The possibility of a serious cause is why unexplained blood should not be dismissed, even when there is no pain.

Other clues help point the assessment in the right direction. Burning or frequent urination can suggest infection; severe one-sided back or flank pain can occur with a stone. Blood together with urine protein, a change in kidney function, swelling or high blood pressure can raise concern about a kidney source. Our guide to protein in urine and its next steps explains that second clue in more detail.

Blood-thinning medicines can make bleeding more noticeable, but they do not establish its cause. Tell the clinician which medicines you take, and do not stop a prescribed blood thinner on your own.

What happens after an abnormal result?

Your clinician may:

1. Clarify the finding: review the dipstick, request urine microscopy if needed, and decide whether a repeat clean-catch sample is appropriate.
2. Look for a treatable cause: ask about symptoms, exercise, menstruation, medicines, smoking and past stones; a urine culture may help if an infection is suspected.
3. Check the wider kidney picture: measure blood pressure and, when appropriate, order creatinine/eGFR and urine protein or albumin tests. See how these fit together in our article on three kidney tests that give a fuller picture.
4. Choose further assessment if needed: persistent or unexplained blood may lead to imaging, a bladder examination called cystoscopy, or a specialist referral, depending on the person’s history and findings.

If blood was attributed to a urinary infection, ask whether your urine needs to be checked again after treatment. The goal is to confirm that the blood has cleared, rather than assume the infection was the only cause.

When should you seek help promptly?

Contact a healthcare professional promptly for urine that visibly looks bloody, even if you feel well. The NHS recommends an urgent assessment for visible blood in urine, including a first episode or a small amount.

Seek urgent medical care if you have blood with fever or chills, severe flank pain, large clots, difficulty passing urine, or feel faint or seriously unwell. Clots can block urine flow. A new microscopic finding without these symptoms still merits a clear follow-up plan; ask your clinician when and how it will be reassessed.

Questions to bring to your appointment

• Was the “blood” result from a dipstick, or were red blood cells confirmed by microscopy?
• Could collection timing or a recent infection have affected this sample?
• Should I have a urine culture, urine protein/albumin test, blood pressure check or kidney blood test?
• If an infection is treated, when should the urine test be repeated?
• What symptoms should make me seek care sooner, and do I need imaging or a specialist review?

The takeaway

Blood found on a urine test is a clue, not a diagnosis. Confirm a dipstick finding, look at the full urine and kidney results, and agree on follow-up that fits your symptoms and risk factors. Visible blood always deserves timely medical attention.

If you want help preparing for that conversation, book a WellNest Central consultation. The consultation provides health education and help organising your questions; diagnosis and treatment decisions belong with your healthcare professional.

This article is for general education and does not replace personal medical advice, diagnosis or emergency care. Seek urgent assessment for visible blood with clots, inability to pass urine, fever, severe pain, faintness or serious illness.

Selected references

• NIDDK: Hematuria (Blood in the Urine)
• National Kidney Foundation: Hematuria in Adults
• NHS: Blood in Urine