calculated kidney protein composition measurement kidney protein carbonyl level to total protein level ratio clinical_measurement_ontology CMO:0002237 2014-03-10T18:04:53Z A calculated measurement in which the level of protein carbonyl (PCO) derivatives in a specified sample of kidney is divided by the total amount of protein in the sample. Protein carbonyl (PCO) derivatives are produced by the oxidation of amino acids and can be used as a marker of oxidative stress. jsmith