One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin) or one 4.5 mL light green plasma separator tube (PST).
Handling:
Allow to clot, centrifuge SST or PST within 2 hours of collection and transport in original tube. Centrifuge green top tube within 2 hours of collection, separate plasma from cells into a plastic vial for transport. Refrigerate.