Creatinine-Jaffe Kinetic-Serum

Creatinine Test Overview Creatinine is a by-product of a chemical substance called creatine, which helps muscles get the energy they need. As a waste product, Creatinine is filtered out of the blood by the kidneys and removed from the body through urine. A Creatinine test checks the level of this chemical in either the blood or urine. Creatinine levels can provide an indicator of how well the kidneys are working.