Ever peed in a cup? Then you've probably had a urinalysis, or a pee test. Urinalysis helps a doctor learn more about what's going on inside your body. Sometimes your pee has stuff in it that shouldn't be there, like sugar, which may mean you have diabetes. If you have a bladder infection, a doctor might find bacteria or white blood cells in your urine. A doctor can spot these and many other problems by examining urine. You can really tell a lot about people by looking at their urine!