Blood in the urine is never normal, but it can be present for benign and not-so-benign reasons. “Microscopic hematuria” is when blood is only seen on a urine test (urinalysis), or “gross hematuria” where actual blood or clots are seen in the urine.
There are many urinary tract issues that can lead to both, but essentially, blood in the urine can come from the kidney, ureter, bladder or urethra. Often menstural blood, or if urine contacts labial skin/hair on the way out prior to hitting the cup, can both lead to false positives. Read more