Uric Acid, Timed Urine


Abbrev Code:UURICT   
Order Code:LAB450Order Name:Uric Acid Timed Urine
Methodology:Roche:
Vista: Bichromatic endpoint
St. Johns/Woodwinds: Uricase
CPT Codes: 84560 x1, 84560 x1, 81050 x1, 81050 x1
Test Includes:Uric acid urine mg/dL; uric acid urine g/spec; duration in hours, volume in mL
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Urine Collection Procedure, Roche Go Live Schedule



Collection Instructions

Specimen:Urine, timed collection (20 to 28 hours)
Optimal Volume:Submit entire collection; analysis requires 1 mL
Container:3 L plastic jug
Patient Preparation:A number of drugs affect uric acid excretion; positive interferences may be caused by caffeine and theophylline. Drugs to avoid include aspirin and other anti-inflammatory preparations, x-ray contrast agents, vitamin C and warfarin.


Processing and Shipping

Specimen Processing:Mix collection well before aliquot is taken. Aliquot 5 mL, 1 mL minimum. Store at room temperature.
Refrigeration of the specimen may result in precipitation of uric acid, which must be re-dissolved by warming slightly (50C) before aliquoting. Urine containing bladder fluid is acceptable. Enter coded comment IRRFL (urine contains bladder irrigation fluid).
Shipping Instructions:Ship at room temperature.
Stability:
3 to 4 days at room temperature or refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (Range, Roche-UMMC East, Southdale, UMMC West Bank)


Interpretive

Reference Range:Urine Chemistry Reference Ranges
Use:Evaluate metabolism of urate, including gout and renal stones.


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