Ordering Recommendation

Aids in diagnosis of kidney stones. Aids in monitoring uric acid levels in patients at risk for kidney stone development (eg, gout).

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation

24-hour urine. Refrigerate specimen during collection. Also acceptable: Random urine.

Specimen Preparation

Urine pH must be adjusted to greater than 8.0.  If pH is less than or equal to 8.0, adjust pH to greater than 8.0 by adding 5 percent NaOH.  Mix well and allow entire 24-hour collection to stand for 15 minutes. Recheck pH and readjust if necessary. Transfer one 3 mL aliquot from a well-mixed 24-hour collection to an ARUP standard transport tube. (Min: 0.5 mL) Record total volume, collection time interval, and pH on transport tube or aliquot tube and on test request form.

Storage/Transport Temperature


Unacceptable Conditions

Specimens with pH less than 8.0. Urine collected with acid.


Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 1 month


Quantitative Spectrophotometry




Within 24 hours

Reference Interval

250-750 mg/d

Interpretive Data

Compliance Category



Reference interval for random urine has not been established.

Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0020207 Creatinine, Urine - per volume 2161-8
0020208 Creatinine, Urine - per 24h 2162-6
0020218 Uric Acid, Urine - per volume 3086-6
0020219 Uric Acid, Urine - per 24h 3087-4
0097110 Total Volume 19153-6
0097111 Hours Collected 30211-7
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • urine uric acid concentration
  • urine uric acid level
Uric Acid, Urine