2 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. freeze. Critical Frozen (CFZ). Protect sample from light during collection, storage and transport.
2 mL EDTA (lavender 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 plasma. Freeze. Critical Frozen (CFZ). Protect sample from light during collection, storage, and transport.