One 7.5 mL serum separator tube (SST). Also acceptable: One 5 mL red top tube or one 4 mL green top tube (heparin).
Handling:
Centrifuge SST and transport in original tube. Specimens drawn in green top tube must be centrifuged and the plasma separated into a plastic vial for transport. Refrigerate. Freeze if specimen cannot be assayed within 7 days. Allow no more than one freeze/thaw cycle.
Stability:
8 hours ambient, 7 days refrigerated, or 1 month frozen.
Standard Volume:
0.5 mL serum or plasma.
Minimum Volume:
0.4 mL serum or plasma.
Transport:
Refrigerated; or frozen on dry ice.
Rejection Criteria:
Specimens frozen and thawed more than once; lavender top tube (EDTA).
Reference Range:
Please note new reference range based on in-house reference range study.