Urine Red Cells (Erythrocytes)

Urine red cells check for blood in your urine, which can signal infection, stones, or other urinary tract problems.

📋 About This Biomarker

Red blood cells (RBCs) in urine are normally not present in noticeable amounts. These are the same cells that carry oxygen in your blood, and they don’t usually pass through into your urine unless there’s irritation, damage, or bleeding somewhere in the urinary tract - such as the kidneys, ureters, bladder, or urethra. The presence of red cells is called haematuria, and it can either be visible (making the urine look red or tea-coloured) or microscopic (only seen under a microscope). Whether you're male or female, this marker is important for identifying issues like urinary tract infections, kidney stones, inflammation, or, in some cases, more serious conditions like bladder or kidney cancer.

🎯 Why We Test This

Testing for red blood cells in the urine helps detect issues like UTIs, kidney stones, bladder infections, and other urinary tract problems early - often before symptoms appear. It’s also useful if you’re experiencing changes in urination, lower back pain, or unusual urine colour. Regular monitoring is especially important for people with kidney or bladder conditions, or those at risk due to family history or previous infections.

⚠️ What Affects It

Several things can cause red blood cells to appear in the urine. The most common are urinary tract infections (UTIs), kidney stones, physical injury, intense exercise, or inflammation. In females, menstruation or vaginal contamination can sometimes cause a false-positive result. In males, an enlarged or inflamed prostate may also contribute. In rare cases, red cells in urine could signal more serious issues like kidney disease or tumours, especially if persistent.

📈 How to Improve

If red cells are high or borderline, it’s key to find and treat the cause. UTIs may need antibiotics, stones may need to pass or be removed, and bladder irritation may require hydration and lifestyle adjustments. Avoiding bladder irritants (like caffeine and alcohol), staying well-hydrated, and practising good hygiene can also help. If red cells are low or not present - great! Maintain these habits to support urinary health. Always follow up with a healthcare provider if high levels persist or if you’re unsure why they are elevated.

📊 Understanding Your Results (10^6/L)

Low
Having no detectable red blood cells in your urine is a positive sign - it means there is no bleeding or irritation in the urinary tract.
Optimal
A normal red cell count in urine means there’s no visible or microscopic blood, and your urinary tract is not inflamed or bleeding. This is the ideal outcome and a good sign of urinary system health. If the red cell count is slightly raised, it may be a sign of mild irritation, inflammation, or contamination (especially if the sample wasn't collected midstream). It’s worth repeating the test or checking for infection. It’s also a good time to increase hydration, monitor symptoms, and speak with your doctor if unsure. Urine red cells are usually very low or absent - so results near the bottom of the range are completely normal and not a concern.
High (> 10 10^6/L)
Higher levels of red cells in urine suggest bleeding somewhere in the urinary system. This could be due to a UTI, kidney stone, trauma, or a condition affecting the kidneys or bladder. If you have visible blood in your urine (haematuria), or a consistent elevation on tests, it’s important to investigate further with your doctor. While often caused by something minor, persistent haematuria may need imaging or a referral to a specialist to rule out serious conditions.