Urine Creatinine, 12 HR

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

Test Code

Alias/See Also
Creatinine (12 HOUR URINE),
URINE Creatinine,
URINE, Creatinine (12-HOUR URINE)

CPT Codes
81050, 82570

Preferred Specimen
12 hour urine specimen. No preservative necessary if kept refrigerated during collection

Transport 12 urine container in sealed plastic bag

Transport Container
12-HR. Urine Collection Container

Transport Temperature

Specimen Stability
Room Temperature = 2 days
Refrigerated = 6 days
Frozen = 6 months

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.


Setup Schedule

Report Available

Clinical Significance
Creatinine is the endproduct of creatine metabolism. Creatine is present primarily in muscle and the amount of creatinine produced is related to total skeletal muscle mass. Daily creatinine production is fairly constant except when there is massive injury to muscle. The kidneys excrete creatinine very efficiently and blood levels and daily urinary excretion of creatinine fluctuates very little in healthy normal people.

Performing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, Ohio 45439

Last Updated: May 25, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.