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 specimens, more than one freeze/thaw cycle.
Offsite: Frozen. Send serum Priority Overnight via FedEx and in a well insulated container on dry ice.
8 hours room temperature
48 hours refrigerated at 2-8°C
>48 hour frozen at -20°C
1 Step Competitive Chemiluminescent
Results same day if samples are received prior to 6PM
Triiodothyronine Uptake (T3 Uptake)
32.0 - 48.4% Uptake