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