Test Overview
Test Methodology


Test Usage

Assessing the body pool size of oxalate.

Reference Range *

< or = 2.0 mcmol/L. Reference values have not been established for patients under 21 and greater than 81 years of age.

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

Test Limitations

Because increased production and decreased excretion rates of oxalate can increase the plasma oxalate concentration, the interpretation of any given plasma value must consider the patient's clinical setting.

Test Details
Days Set Up
Monday - Friday
Analytic Time

3 - 7 days

Soft Order Code
MiChart Code
Oxalate Plasma (Sendout)
Reference Laboratory
Mayo POXA1
Special Testing
Specimen Requirements
Collection Instructions

Patient should avoid taking vitamin C supplements for 24 hours prior to specimen collection. Collect specimen in sufficient green top tubes from a fasting patient. Place on wet ice immediately following collection. Centrifuge for 10 minutes at 2,000 rpm at 4 degrees C within 1 hour of collection and aliquot plasma into a plastic vial. Adjust the pH of the plasma specimen to a pH of 1 to 3.5 (ideal range is 2.3-2.7) with approximately 10 mcL concentrated (12N) HCl per 1 mL plasma or deliver to MLabs within 1 hour of collection. Freeze.

Special Handling

Fasting specimen. Place tube on wet ice immediately following collection. Deliver to laboratory or process within 1 hour of collection. Pass to Chemistry for acidification of plasma before freezing.

Alternate Specimen
Non acidified plasma can be accepted if it has been properly frozen.
Normal Volume
5 mL plasma
Minimum Volume
2 mL plasma
Storage Temperature
Additional Information

Test sent to Mayo Medical Laboratories.

CPT Code
Fee Code