One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin), one 4.5 mL plasma separator tube (PST), or one 4 mL lavender top tube (EDTA).
Centrifuge SST or PST within 2 hours of collection and transport in original tube. Centrifuge heparin or EDTA tube within 2 hours of collection and the plasma separated into a plastic vial for transport. Refrigerate. If specimen cannot be assayed within 48 hours, freeze. Note last dose date and time.
0.5 mL serum or plasma.
150 uL serum or plasma.
Refrigerated if received in laboratory within 24 hours of collection. or frozen on dry ice.
Specimen frozen and thawed more than once; refrigerated specimen received in laboratory more than 48 hours after collection.