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 and separate SST or PST within 2 hours of collection and transport in original tube. Heparin or EDTA must be Freeze if specimen cannot be assayed within 48 hours. Allow no more than one freeze/thaw cycle. Note time and date of last dose.
0.5 mL serum or plasma.
150 uL serum or plasma.
Refrigerated, or frozen on dry ice.
Specimens frozen and thawed more than once; refrigerated specimen received in laboratory more than 48 hours after collection.