One 7 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). Draw 30-45 minutes following completion of infusion or 60 minutes following I.M. injection.
Centrifuge SST or PST within 2 hours of collection and transport in original tube. Heparin or EDTA tube must be centrifuged within 2 hours of collection and the plasma separated into a plastic vial for transport. Refrigerate. Freeze if specimen cannot be assayed within 48 hours. Note date and time of last dose.
0.5 mL serum or plasma.
150 µL serum or plasma.
Refrigerated, or frozen on dry ice.
Specimen that has been frozen and thawed more than once; refrigerated specimen received in laboratory more than 48 hours after collection.