Test Overview
Enzymatic
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.
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
3 - 7 days
Specimen Requirements
Patient Preparation:
- Fasting: 12 hours, preferred but not required
- For 24 hours before specimen collection, the patient should not take vitamin C supplements.
Collection Instructions:
- Place specimen on wet ice immediately.
- Within 1 hour of collection, centrifuge for 10 minutes at 3500 rpm. Use of a 4 degrees C refrigerated centrifuge is optimal but not required.
- Aliquot plasma into a plastic vial.
- Pass the aliquot to Chemistry on ice
- Chem/tox will adjust the pH of the plasma specimen to a pH of 2.3-2.7 with approximately 10 mcL concentrated (12M) hydrochloric acid (or 20 mcL of 6M HCl) per 1 mL plasma.
Patient Preparation:
- Fasting: 12 hours, preferred but not required
- For 24 hours before specimen collection, the patient should not take vitamin C supplements.
Collection Instructions:
- Place specimen on wet ice immediately.
- Within 1 hour of collection, centrifuge for 10 minutes at 3500 rpm. Use of a 4 degrees C refrigerated centrifuge is optimal but not required.
- Aliquot plasma into a plastic vial.
- Pass the aliquot to Chemistry on ice
- Chem/tox will adjust the pH of the plasma specimen to a pH of 2.3-2.7 with approximately 10 mcL concentrated (12M) hydrochloric acid (or 20 mcL of 6M HCl) per 1 mL plasma.
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.
Non acidified plasma can be accepted if it has been properly frozen.
5 mL plasma
2 mL plasma
Additional Information
Test sent to Mayo Medical Laboratories.