Test Code Billings Clinic: 4118 Creatinine, 24 Hour, Urine

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Useful For

Urinary creatinine, in conjunction with serum creatinine, is used to calculate the creatinine clearance, a measure of renal function.

Methodology

Modified Jaffe method

Specimen Requirements

10 mL from a 24-hour urine collection in a urine container.
Refrigerate specimen during collection, and send specimen refrigerated.
DO NOT ADD PRESERVATIVES
24-Hour volume is required on request form for processing.
Follow instructions in “Urine Collection” under "Resources"

Storage/Stability

Specimen Type	Temperature	Time
Urine	Refrigerated (preferred)	4 days
	Frozen	1 month

Reject Due To

Specimens received containing additives
Specimens with apparent contamination

Reference Values

600 - 1500 mg/24 hours

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

82570 - Creatinine; other source

LOINC Code Information

Reporting Name	LOINC Code
Creatinine, Urine	2161-8
Creatinine, Urine 24 hr	2162-6
Volume, Urine	28009-9