Microscopic Haematuria: When to Worry?
Understanding an abnormal urine test result
Quick answer
Microscopic haematuria is the presence of blood in the urine detected only on testing, with no colouring visible to the naked eye. Most often benign (infection, stone), it warrants a work-up to rule out rarer causes requiring treatment.
What is microscopic haematuria?
Microscopic haematuria is the presence of blood in the urine, detected only on testing, without the urine being visibly coloured to the naked eye, unlike macroscopic haematuria.
What are the possible causes?
The causes are numerous and most often benign: urinary tract infection, kidney stone, intense physical exertion. More rarely, it may reveal a urinary tract disease that needs to be ruled out, particularly in patients over 50 or smokers.
Which tests are offered?
The initial work-up generally includes a repeat urine test, a urine culture (ECBU) to rule out an infection, then, depending on the context, imaging of the urinary tract.
Frequently asked questions
Is isolated microscopic haematuria serious?
Should I seek urgent care?
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Written by the Interventional Radiology team at Cochin Hospital AP-HP, Université Paris Cité. Medically reviewed by an interventional radiologist of the department. Last updated: August 2026.