Advanced Diagnostic Laboratories

Collect

Plain red top or SST tube.

Specimen Preparation

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

Pediatric Collection

Minimum volume: 0.5mL serum

Unacceptable Conditions

Grossly hemolyzed specimens, more than one freeze/thaw cycle.

Storage Transport Temp

Offsite: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.

Stability

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)

Performed

Mon & Thurs

Methodology

Chemiluminescent Magnetic Immunoassay (CLIA)

Reported

Results same day if samples are received  Mon or Thurs prior to 6PM; 48-72 hours

Department

Core Lab

Synonyms

TT4 (Thyroxine, total, serum);TT4

Reference Interval

6.1 - 12.2 ug/dL

CPT Code

84436