Creatinine, urine

Test Code

CREATININE, URINE

Alias/See Also

Chemistry

Preferred Specimen

Random urine

Transport Temperature

Refrigerate

Specimen Stability

Room temperature: 2 days
Refrigerated (2-8°C): 6 days
Frozen (-20°C or colder): 6 months

Methodology
Kinetic Jaffe

Setup Schedule

Daily

Report Available

TAT 1 day

Reference Range

63-166 mg/dL (males)
47-110 mg/dL (females)

Clinical Significance

Creatinine is the endproduct of creatinine metabolism.Creatinine 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 a massive injury to muscle.The kidneys excrete creatinine very efficiently and blood levels and daily urinary excretion of creatinine fluctuate very little in healthy normal people. Since blood and daily urine excretion of creatinine show minimal fluctuation, creatinine excretion is useful in determining whether 24-hour urine specimens for other analysis (e.g., Protein) have been completely and accurately collected.

Performing Laboratory
Test performed in these BACL Chemistry Labs
Contact: Jonathan Dryjowicz-Burek, West Roxbury 857-203-5973
Alternate contact: Joseph A. Manzone JP 857-364-5092

Last Updated: February 12, 2025

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.