Oxalic Acid, 24-Hour Urine without Creatinine

Test code

11318

CPT code(s)*

83945

Not offered in Quest Nichols Institute - Chantilly, VA | Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide Service Area Information to find available tests you can order.

In-home collection is not available in your area through Quest Mobile.

Clinical significance

Oxalic Acid, 24-Hour Urine without Creatinine - This quantitative test, performed with a 24-hour urine specimen, may help screen for hyperoxaluria, determine the cause of kidney stones, and monitor treatment compliance and outcomes [1]. In general, 24-hour urine specimens are preferred to random urine specimens when measuring oxalic acid for diagnostic evaluation and monitoring of hyperoxaluria [1,2].Oxalic acid is an organic compound that naturally exists in many food sources. Because humans cannot metabolize oxalic acid, it must be excreted in urine as oxalate (the ionic form of oxalic acid). Excessive excretion of oxalates is called hyperoxaluria and can be attributed…

Test resources

None found for this test
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Details

Test details

Includes

CPT code 81050 may be added at an additional charge for volume measurement

Methodology

Spectrophotometry (SP)

Specimen requirements
Patient preparation	Patient should refrain from taking excessive amounts of ascorbic acid or oxalate-rich foods (i.e., spinach, coffee, tea, chocolate, rhubarb) for at least 48 hours prior to collection period
Preferred specimen(s)	10 mL aliquot from a 24-hour urine collection
Minimum volume	2 mL
Collection instructions	Collect urine with 25 mL of 6N HCl to maintain a pH below 3. Refrigerate during and after collection.
Transport container	Plastic urine container
Transport temperature	Room temperature
Specimen stability	Room temperature: 7 days Refrigerated: 7 days Frozen: 24 days

Reference range(s)

3.6-38.0 mg/24 h

LOINC® codes

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Service Area Information

Performing lab & setup schedule

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Service Area Information

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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