If you think you have had some urinary symptoms your doctor may test your urine with paper stick tests that look for various factors such as traces of blood.
Blood can mean a UTI, but there are other causes.
Once you test positive, you should have enough evaluation to come up with a cause.
Vigorous exercise that leads to some muscle breakdown which can cause red urine from something called myoglobulinuria, and it rarely can trigger a positive reading on those sticks as well.
Ladies can have some residual blood from their period that is not coming from the bladder, but makes its way into the urine.
Even having sex too close to your doctors appointment can make the blood square read positive from semen!