The creatinine clearance test is an older test used to check your kidney function. This test allows your healthcare provider to look at samples of your urine and blood to see how much of the waste product — creatinine — is filtered out by your kidneys.

SPECIMEN: 10 mL (5 mL min.) aliquot of 24-hour urine AND 2 mL (0.5 mL min.) serum from 1 SST. Record patient height, weight and total 24-hour urinary volume on test request form and urine container. Ship refrigerated or frozen.

STABILITY: Room: 6 hrs; Refrigerated: 1 week; Frozen: 2 weeks

REPORT: Daily

GENERAL INSTRUCTIONS: Nil.

USAGE: Creatinine clearance reflects the glomerular filtration rate, the ability of kidneys to filter waste products. Moderate decrease in renal function is detected by creatinine clearance. It also monitors progression of renal disease.