Creatinine, 24-Hour Urine : 381

Test Code

24CRAU or 381

CPT Codes
82570

Instructions

Record total volume and collection time on specimen container and test requisition.

Transport Container

Preferred Specimen
10 mL urine aliquot from a well-mixed, 24-hour collection - no preservative

Alternative Specimens
Acidified urine; Urinalysis transport tube (yellow-top, blue fill line, preservative tube)

Minimum Volume
2 mL

Transport Temperature

Room temperature.

Specimen Stability

Room temperature: 7 days; Refrigerated: 7 days; Frozen: 28 days

Methodology
Colorimetric; Kinetic

Setup Schedule

Sunday - Saturday

Report Available

1 day

Reference Range

<3 Years Not established

3-8 Years 0.10-0.80 g/24 h

9-12 Years 0.20-1.40 g/24 h

13-17 Years 0.40-1.90 g/24 h

>17 Years 0.50-2.15 g/24 h

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. Since blood and daily urine excretion of creatinine shows minimal fluctuation, creatinine excretion is useful in determining whether 24-hour urine specimens for other analytes (e.g., protein) have been completely and accurately collected.

Performing Laboratory
med fusion

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.