Skip to main content

Creatinine 24 hr Urine

CPT/HCPCS 82570
Order Code U004
Turnaround Time 24 hours
Specimen Requirements
Specimen Source
Urine
Transport Container
(Specimen Container)

Plastic screw-cap container

Preferred Specimens
Urine
Collection Instructions
(Transport Temperature)
Transport at Room Temperature
Specimen Stability
Temperature Period
Room temperature 7 days
Refrigerated 7 days
Frozen 28 days
Special Instructions

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

Test Details
Methodology
Spectrophotometry
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.

Reference Ranges

800 – 1800 mg/24hr