Days Set Up
Weekly, Wednesday.
Analytic Time

8 hours

MiChart Code
Oxalate, 24 HR Urine
Soft Order Code
OXALQ

Test Updated:

Synonyms

Calcium Oxalate
Oxalic Acid
Oxalic Acid, Urine
OXALATE URINE 24 HOUR
OXALATE

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Test Overview

Test Methodology

Compound Enzyme Assay

Test Usage

Renal function test, patients who form calcium oxalate kidney stones appear to absorb and excrete a higher portion of dietary oxalate in urine than do normal patients.

Reference Range

Less than 40 mg/24 hrs (less than 456 mcMol/24 hrs)

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

24 hour urine. Instruct patient to void at 8:00am (or 8:00pm) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24 hour collection period, i.e., 8:00am (or 8:00pm) the following day. SPECIMEN MUST BE KEPT ON ICE DURING THE COLLECTION. Transport promptly to the laboratory. Container must be labeled with date and time collection started and finished. Any test requiring a 24 hour urine collection, collected in 50% glacial acetic acid, may also be run on this specimen. Cause for Rejection: Specimen not kept chilled; improper container.

Collection Offsite

Collect 24 hour urine specimen. Add 25 mL of 50% glacial acetic acid (15 mL for pediatric patients) to container prior to start of collection. Following collection, mix very well to dissolve any oxalate crystals that may have formed, measure 24 hour urine volume, aliquot 10 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Specimens with no preservative are also acceptable: send entire 24 hour collection to MLabs. Random urine collections not acceptable.

Normal Volume
10 mL aliquot of 24 hour urine collection
Minimum Volume
5 mL aliquot of 24 hour urine collection

Billing Information

CPT Code
83945
Pro Fee Code
 
LOINC
2700-3

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.