Dr. Schoenberg says that people who notice blood in their urine should see their physician. Hematuria is the medical term for blood in the urine. Blood in the urine comes from one of the organs involved in the making or transporting of urine. There are two types of hematuria B microscopic and gross. In microscopic hematuria, blood is seen only when the urine is examined under a microscope.
Gross hematuria means that there is enough blood in the urine to be seen with the naked eye.
The urinary tract produces and transports urine, and consists of the kidneys, ureters, bladder, and urethra. The key players in the system are the kidneys, a pair of organs located below the ribs toward the middle of the back. The kidneys remove from the blood liquid waste in the form of urine, keep a stable balance of salts and other substances in the blood, and produce a hormone that aids the formation of red blood cells. Narrow tubes called ureters carry the urine from the kidneys to the bladder, which is located in the lower abdomen, where urine is stored until it is emptied through the urethra. An average adult passes about a quart and a half of urine each day, with the amount depending on the fluids and foods a person consumes.