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Test ID RURCU Uric Acid, Random, Urine

Useful For

Differentiation of acute uric acid nephropathy from other causes of acute renal failure

 

Patients who cannot collect a 24-hour specimen, typically small children, a uric acid creatinine ratio can be used to approximate 24-hour excretion

Method Name

Uricase

Reporting Name

Uric Acid, Random, U

Specimen Type

Urine

Specimen Required

Container/Tube: Plastic, 6-mL tube (Supply T465)

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.

Additional Information: A timed 24-hour urine collection is usually the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of clinical use in the following 2 scenarios:

1. In patients who cannot collect a 24-hour specimen, typically small children, a uric acid creatinine ratio can be used to approximate 24-hour excretion.

2. When acute renal failure secondary to uric acid is suspected, a uric acid to creatinine ratio (mg/mg) >1.0 is consistent with acute uric acid nephropathy, whereas values <0.75 are consistent with other causes of acute renal failure.(Kelton J, Kelley WN, Holmes EW: A rapid method for the detection of acute uric acid nephropathy. Arch Intern Med 1978; 138:612)

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days

Reference Values

No established reference values

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Performing Laboratory

Mayo Medical Laboratories in Rochester

CPT Code Information

84560

LOINC Code Information

Test ID Test Order Name Order LOINC Value
RURCU Uric Acid, Random, U In Process

 

Result ID Test Result Name Result LOINC Value
URCO2 Uric Acid, Random, U 3086-6
CREA7 Creatinine Concentration 2161-8
RATO6 Uric Acid/Creatinine Ratio 3089-0

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.