Although visible blood in the urine is a well-known symptom, sometimes the urine may look normal, but still contains a small amount of blood, which can only be detected by lobal tests. This is called microscopic hematuria and is regarded as a “color” of urine rather than pink or red.
Because there is no obvious sign like red or pink urine, microscopic blood in the urine often goes unnoticed unless the urine test is made for other reasons. If you have risk factors such as smoking, exposure to harmful chemicals, or a bladder family history, regular urine trials can help you catch these hidden signs early.
Sources:
My clinic, Cleveland Clinic, National Cancer Institute
