Uric Acid, Urine

Casandra

Casandra Test Code AR94660Version 1 (DRAFT)

Performing Lab

Lab ARUP LaboratoriesLab Test ID 0020481CPT Code 84560

Also known as: UURIC

Clinical Use

Order Test

Use

This test aids in the diagnosis of kidney stones and in monitoring uric acid levels in patients at risk for kidney stone development, such as those with gout. By measuring the uric acid levels in a 24-hour urine collection, clinicians can assess the patient's excretion rate, which is useful for detecting underlying metabolic disorders that could contribute to kidney stone formation.

Special Instructions

It's important that the patient's urine pH is adjusted to greater than 8.0; if the pH is less than or equal to 8.0, 5 percent NaOH should be added, mixed well, and the entire collection allowed to stand for 15 minutes before rechecking pH. The specimen must be refrigerated during collection.

Limitations

The test is limited in its application to 24-hour urine collections. Notable deviations in collection time or volume require interpretative adjustments using ratios of analytes to corresponding urine creatinine concentrations. Direct reference intervals are not established for random urine samples, limiting interpretation to timed collections.

Test Details

New York Approved

Methodology

Automated Analyzer (Clinical Chemistry)

Biomarkers

Creatinine

Analyte

Creatinine - per 24h • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Uric Acid

Analyte

Uric Acid - per 24h • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

LOINC Codes

Result Codes

35674-1
2162-6
3086-6
3087-4
19153-6
30211-7

Result Turnaround Time

1 day

Specimen

Urine

Volume

Not provided

Minimum Volume

0.5 mL

Container

ARUP standard transport tube

Collection Instructions

Collect a 24-hour urine sample, refrigerate during collection. After collection, adjust urine pH to greater than 8.0 by adding 5 percent NaOH if necessary.