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Test Code UURC24 Uric Acid, Urine, 24-Hour, LAB841

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: 24-Hour urine collection

Specimen Volume: 0.5 mL from a 24-hour timed urine collection. No preservative.

                               Refrigerate specimen during collection, and send specimen refrigerated.

Collection Instructions: Obtain 24-hour urine jug from laboratory.

Note: 1. Starting and ending times of collection are required for processing.

           2. When a 24-hour urine for uric acid is done, a PV (period and volume) must also be

                ordered and resulted. (FOR LAB USE ONLY).

           3. Alternatively the specimen can be collected with 10 mL 1N NaOH as a preservative to

               prevent urate precipitation. If the urine is being collected with other tests, it can be just

               refrigerated during collection, then the aliquot for uric acid should be alkalinized before

               assaying if there are precipitates present.

 

Reference Values

150-990 mg/24 hours

Useful For

Urine uric acid increases are associated with end stage renal disease, renal tubular defects and nephrolithiasis.

Day(s) Test Set Up

Monday through Sunday

Methodology

Uricase

Test Classification and CPT Coding

81050-Timed urine measurement

84560-Uric acid