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Uric Acid, 24-Hour Urine with Creatinine
Test Code907
CPT Codes
82570, 84560
Includes
CPT code 81050 may be added at an additional charge for volume measurement
Preferred Specimen
10 mL aliquot from a well mixed 24-hour urine collection - no preservative
Minimum Volume
2 mL
Instructions
Do not acidify the urine. Please aliquot for uric acid testing prior to addition of any acid for those tests requiring preservative.
Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Specify 24-hour total volume on container and test requistition.
Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Specify 24-hour total volume on container and test requistition.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 13 days
Refrigerated: 13 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Acid preserved urine
Methodology
Spectrophotometry (SP)
Setup Schedule
A.M. Sets up 2 days a week.
Report Available
Reports in 3 to 4 days.
Clinical Significance
Urine uric acid may supplement serum uric acid testing when trying to identify conditions in which there is alteration of uric acid production or excretion, e.g., gout, leukemia, renal disease. The amount of uric acid excreted may be useful in treating asymptomatic hyperuricemia. Measurement of urine uric acid is important in the investigation of urolithiasis.
