Urine Creatinine test measures the level of Creatinine in your urine. Creatinine is a waste product of the body and your kidneys filter Creatinine out of your blood and pass it out of your body through urine. The Urine Creatinine test is often done as part of a health examination or to check kidney function. It can also be used in combination with other tests, such as the blood creatinine test or microalbumin. These tests are used to evaluate kidney function as well as to detect other urinary tract disorders.