While visible blood in the urine is a well-known symptom, sometimes the urine may look normal, but still contain small amounts of blood that can only be detected by lab tests. This is called microscopic hematuria, and is seen as an “off color” of urine rather than a pink or red color.
Because there is no obvious sign like red or pink urine, microscopic blood in the urine often goes unnoticed unless a urine test is done for other reasons. If you have risk factors such as smoking, exposure to harmful chemicals, or a family history of bladder cancer, regular urine tests can help catch these hidden signs early.
Sources:
Mayo Clinic, Cleveland Clinic, The National Cancer Institute
