Test Name

Creatinine 24 h
urine

Test Code

261

Unit

mg/24h

Station

Chemistry

Synonym Name/Abbreviation

Urine creatinine, 24 h

CPT Code

82570

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Kinetic Jaffe’, rate blanked, compensated, traceable to IDMS

AML Preferred Tube

24 hour urine collection

Storage Instructions

Refrigerated.

Stability:

48h 15-25 ^oC

6 days 2-8 ^oC

6 months -15 to -25 ^oC

Min. Volume

10 mL of well mixed urine from measured 24 hour
collection.

Turn-Around-Time

One day

Intended Use

Renal function test when used as part of creatinine
clearance; crude marker for completeness of 24-hour urine collections when
collected for other purposes

Limitations

Complete urine collections require vigilance on the part of
nursing personnel. Ingestion of meat may increase creatinine values of
urine collections as well as serum creatinine values. Drugs interfering
with tubular creatinine secretion include cimetidine, trimethoprim, and
probenecid.

Patient Preparation

 Urine
collection: Collect 24 h urine without additives. The patient will be
instructed to void at 8 AM and discard the specimen. Then collect all
urines including the final specimen voided at the end of the 24-hour
collection period (i.e. 8 AM the next morning). Date and time of starting
colection and total volume must be stated. Screw the lid on securely.
Transport the specimen promptly to the
laboratory.

Reasons for Rejection

Collection times not indicated; improper
labeling

Adult Reference Ranges

Male: 980 to 2200 mg/24h; Female 720 to 1510
mg/24h