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: 0.3mL serum

Unacceptable Conditions

Grossly hemolyzed, icteric, and lipemic specimens

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  ≤ -10°C (avoid multiple freeze / thaws)

Performed

Mon-Fri

Methodology

2 Step Competitive with Labeled Antibody Chemiluminescent

Reported

Results same day if samples are received prior to 6PM

Department

Core Lab

Synonyms

Free T4 (Thyroxine, free, serum);FRT4

Reference Interval

0.6 - 1.1 ng/dL

CPT Code

84439