A 24-hour urine collection helps diagnose kidney problems. It is often done to see how much creatinine clears through the kidneys. It’s also done to measure protein, hormones, minerals, and other chemical compounds.

SPECIMEN: 10 mL (5 mL min.) aliquot of 24-hour urine. Record 24-hour volume and patient weight on test request form and urine container. Ship refrigerated or frozen.
STABILITY: Room: 6 hrs; Refrigerated: 1 week; Frozen: 2 weeks
REPORT: Daily
USAGE: Urinary creatinine is useful as part of the creatinine clearance and to assess completeness of 24 hour urinary collections.