One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL light green top tube (heparin) or one 4.5 mL plasma separator tube (PST).
Centrifuge SST or PST within 2 hours and transport in original tube. Centrifuge heparin tube, separate plasma from cells and pour into a plastic vial. Refrigerate. Freeze if specimen cannot be assayed within 48 hours. Allow no more than one freeze/thaw cycle.
48 hours refrigerated.
0.5 mL serum or plasma.
150 µL serum or plasma.
Refrigerated, or if frozen, on dry ice.
Refrigerated specimen received in laboratory more than 48 hours after collection; specimen frozen and thawed more than once.