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Test Code LAB13312 Urine Uric Acid Random

Department

Chemistry

Reference Lab Test Number

LAB13312

Primary Collection Container

Yellow Urine Vacutainer (No Additive)

Transport

Refrigerated

Preferred Transport Temperature

Refrigerated

Processing

Centrifuge and refrigerate.

Stability

Ambient: 3 days

Refrigerated: 3 days

Frozen: 6 months

Minimum Testing Volume

0.5 ml

Reference Range

No reference ranges have been established.

Methodology

The uric acid method is a modification of the uricase method first reported by Bulger and Johns1, later modified by Kalckar.2 Uric acid, which absorbs light at 293 nm, is converted by uricase to allantoin, which is nonabsorbing at 293 nm. The change in absorbance at 293 nm due to the disappearance of uric acid is directly proportional to the concentration of uric acid in the sample and is measured using a bichromatic (293, 700 nm) endpoint technique. Measurement of uric acid by monitoring the loss of absorbance at 293 nm following uricase treatment is generally recognized as being more specific and less subject to interference than other indirect methods. Siemens Diemension Vista

Performed

Sunday – Saturday

Reported

As completed

CPT Codes

84560