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 1 hour of collection and transport in original tube. Specimen drawn in green top tube must be centrifuged within one hour of collection and the plasma separated into a plastic vial for transport.
Stability:
Specimen stable 48 hours ambient or 7 days refrigerated. Specimen unstable frozen.