Uric Acid, Urine
Also known as: UURIC
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.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 35674-1
- 2162-6
- 3086-6
- 3087-4
- 19153-6
- 30211-7
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
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.
Storage Instructions
Refrigerate specimen during collection and transport.
Causes for Rejection
Specimens with a pH less than 8.0 or collected with acid are unacceptable.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 4 days |
| Refrigerated | 2 weeks |
| Frozen | 1 month |