Why a tiny amount of blood in pee can mean cancer—even if scans look normal
High-grade microscopic hematuria in adult men can predict urothelial malignancy.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Urine cytology was negative in all 4 cancer cases, despite the presence of confirmed urothelial malignancy.
Urine cytology is widely used as a non-invasive cancer screen, but here it failed completely—even for invasive cancers—contradicting the assumption that it’s reliable for early detection.
Practical Takeaways
If you’re under 40 and have persistent microscopic hematuria (≥25 RBC/HPF) with normal CT, insist on a cystoscopy—even if you feel fine.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Urine cytology was negative in all 4 cancer cases, despite the presence of confirmed urothelial malignancy.
Urine cytology is widely used as a non-invasive cancer screen, but here it failed completely—even for invasive cancers—contradicting the assumption that it’s reliable for early detection.
Practical Takeaways
If you’re under 40 and have persistent microscopic hematuria (≥25 RBC/HPF) with normal CT, insist on a cystoscopy—even if you feel fine.
Publication
Journal
Canadian Urological Association journal = Journal de l'Association des urologues du Canada
Year
2014
Authors
A. Kotb, D. Attia
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Claims (6)
Even when young men only have mild bladder symptoms like burning when peeing—along with blood in urine—they can still have bladder or ureter cancer.
When young men with blood in urine also have side pain, looking inside the ureter with a scope found cancer in one out of two cases—even though the CT scan showed nothing wrong.
Hematuria, whether gross or microscopic, is a pathological indicator requiring clinical evaluation due to its association with urological malignancies, including prostate and bladder cancer.
In young men under 40 who have blood in their urine (but no infection or kidney stones seen on scan), about 1 in 5 turned out to have a bladder or ureter cancer when doctors looked inside with a scope.
When doctors looked inside the bladder and didn’t see any tumors, taking random tissue samples from normal-looking areas never found cancer—so those biopsies don’t help.