Oxalic Acid
14 days
High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS)
Promptly centrifuge and separate Serum or Plasma and transfer to a transfer tube.
Accredited Laboratory Partner
Monday and Friday
Measures oxalate levels. Used in nephrolithiasis and primary hyperoxaluria evaluation.
Serum or Plasma
2 mL
Red-Top Tube or Green-Top (Heparin) Tube
Ascorbic acid at very high concentration (exceeding 51 mcmol/mL plasma) can interfere. It is recommended that patients refrain from taking excessive amounts of vitamin C or vitamin C rich food for at least 48 hours prior to collection.
Cause for Rejection: Received room temperature. Received refrigerated. Gray top tube (Sodium Fluoride/ Potassium Oxalate). Polymer gel separation tube (SST or PST).
| Temperature | Period |
|---|---|
| Frozen | 30 days |