a waste product found in the blood that results from the normal breakdown of protein in the liver. Urea is normally removed from the blood by the kidneys and then excreted in the urine.

the illness associated with the buildup of urea in the blood because the kidneys are not working effectively. Symptoms include nausea, vomiting, loss of appetite, weakness, and mental confusion.

the liquid waste product filtered from the blood by the kidneys, stored in the bladder, and expelled from the body by the act of urinating.

also called urinalysis; a test of a urine sample to diagnose diseases of the urinary system and other body systems. Urine may also be checked for signs of bleeding. Some tests use a single urine sample. For others, 24-hour collection may be…

a doctor who treats people who have urinary tract problems. A urologist also cares for men who have problems with their genital organs, such as impotence.