Plain red top or SST tube.
Onsite [NJH]: Transport to lab within 1 hour.
Offsite: Separate serum from cells within 2 hours by centrifuge and aliquot into a labeled polypropylene or similar plastic tube.
Preferred volume: 1 mL serum
Minimum volume: 0.3mL serum
Grossly hemolyzed, icteric, and lipemic specimens
Offsite: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability after cell separation:
24 hours at RT (15-25°C)
6 days refrigerated at 2-8°C
>6 days ≤ -10°C (avoid multiple freeze / thaws)
2 Step Competitive with Labeled Antibody Chemiluminescent
Results same day if samples are received prior to 6PM
Free T4 (Thyroxine, free, serum);FRT4
0.6 - 1.1 ng/dL