Creatine and Creatinine, 24-Hour Urine

Creatine and Creatinine, 24-Hour Urine

CPT Test code: 82540;82570

Test Includes: Creatine, urine; creatinine, urine; creatine:creatinine ratio; eGFR calculation
Related Information:
Specimen: Urine (24-hour), frozen
Volume: 10 mL aliquot
Minimum Volume: 1 mL aliquot
Container: Plastic urine container
Special Instructions: State patient’s sex and 24-hour volume on the test request form.
Collection: Collect 24-hour urine, no preservative. Mix well.
Storage Instructions: Freeze
Causes for Rejection: Thawed creatine specimen; 6N HCl, boric acid, or alkali added to collection (Acid or alkali preservative will convert creatine to creatinine, falsely lowering creatine values.)