3 - 7 days
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Assessing the body pool size of oxalate.
< 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.
Place tube on ice after collection. Must be processed within one hour. Deliver to Specimen Processing immediately.
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.