One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin) or one 4.5 mL plasma separator tube (PST).
Handling:
Centrifuge SST or PST within 2 hours and transport in original tube. Centrifuge green top tube, separate plasma from cells within 2 hours and pour into a plastic vial.