urine creatine measurement urine creatine level 2014-05-29T16:49:29Z CHEBI:16919 CMO:0002426 EFO:0010472 JSmith The amount of creatine in a specified sample of urine, the fluid waste product excreted by the kidneys. Creatine is a nitrogenous organic acid (a non-protein amino acid) occurring in vertebrate tissues, particularly in muscle, where the phosphorylated form serves as an important storage form of high-energy phosphate and supplies energy for muscle contraction. clinical_measurement_ontology creatine measurement