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). Do not draw from an arm receiving an intravenous infusion.
Handling:
Centrifuge SST or PST and transport in original tube. Heparin tube must be centrifuged and the plasma separated into a plastic vial for transport. Refrigerate.