Adult: Male: 0.6–1.2 mg/dL; SI units: 53–106 nmol/L. Female: 0.5–1.1
mg/dL; SI units: 44–97 nmol/L
Child: 0.3–0.7 mg/dL
. Red-top tube.
■ Breakdown product of creatine phosphate in muscle.
■ Produced at a constant rate by the body and excreted by the
kidney. Blood level rises in renal impairment.
■ Creatinine level is a sensitive indicator of renal function but is
dependent on kidney function and muscle mass. Patients with
decreased muscle mass do not exhibit a rise in creatinine
levels as readily as those with more muscle mass and should
have an estimated glomerular filtration rate (GFR) reported as
well.
