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.
Stability after cell separation:
24 hours at RT (15-25°C)
6 days refrigerated at 2-8°C.
6 days frozen at ≤ -10°C ( avoid multiple freeze thaw cycles)
Mon & Thurs
Chemiluminescent Magnetic Immunoassay (CLIA)
Results same day if samples are received Mon or Thurs prior to 6PM; 48-72 hours
TT4 (Thyroxine, total, serum);TT4
6.1 - 12.2 ug/dL