1 mL EDTA (lavender top) or sodium lithium heparin (green top) plasma. Centrifuge sample and separate plasma from cells within 2 hours of collection. Transfer plasma to a plastic transport tube. Clearly label tube as EDTA or heparin plasma. Freeze. Critical Frozen (CFZ).
Patient should be fasting overnight and not have ingested any alcohol for 1 day prior to collection.
When multiple tests are ordered, submit separate tube for this test.