Test Name

Uric Acid, 24-hour
Urine

Test Code

265

Unit

mg/24h

Station

Chemistry

CPT Code

84560

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Enzymatic

AML Preferred Tube

 24-hour urine
collection: suitable plastic
container, no preservatives.

Storage Instructions

Do not refrigerate: bring to the laboratory as soon as
possible.

Min. Volume

10 mL of well mixed urine from measured 24 hour
collection.

Turn-Around-Time

One day

Intended Use

Look for hyperuricosuria in patients with renal calculus
formation. Identification of overexcretors re: risks of stone formation,
identification of genetic defects, influence of overexcretion on therapy
of gout. Uric acid nephrolithiasis occurs in primary gout or in secondary
hyperuricemia (e.g. malignant diseases). Uric acid nephrolithiasis may
complicate ulcerative colitis, Crohn disease, and surgical jejunoileal
bypass.  Evaluate uric acid
metabolism in gout.

Limitations

Collection times not indicated; improper
labeling

Patient Preparation

Instruct the patient to void at 8 AM and discard the
specimen. Then collect all urine including the final specimen voided at
the end of the 24-hour collection period (i.e. 8 AM the next
morning).

Reasons for Rejection

Improper labeling; use of
preservative

Adult Reference Ranges

 250 to 1000
mg/24h