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: 0.5mL serum
Grossly hemolyzed specimens, more than one freeze/thaw cycle.
Offsite: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.
8 hours at room temperature.
24 hours refrigerated at 2-8°C.
>24 hours frozen at -20°C
2 Step Competitive Chemiluminescent
Results same day if samples are received prior to 6PM
T4 (Thyroxine, total, serum)
6.1 - 12.2 mcg/dL