What does urinating pure blood mean?

Hematuria: If you have voided what appears to be blood, you need to see a urologist and primary doctor immediately. Blood in the urine must be checked by the doctor (urinalysis, urine culture, and usually ct scan) and look in the bladder with a camera=cystostcopy to make sure that there are no abnormalities of the urinary tract. If you had enough blood to see this, you need immediate evaluation.