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Home > Thyroxine, free, serum
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: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.
8 hours room temperature.
48 hours refrigerated at 2-8 degrees C.
>48 hours frozen at -20 degrees C.
2 Step Competitive with Labeled Antibody Chemiluminescent
Results same day if samples are received prior to 6PM
Free T4 (Thyroxine, free, serum)
0.6 - 1.1 ng/dL
Contact Client Services
Advanced Diagnostic Laboratories
1400 Jackson St
Denver, CO 80206
© 2016 National Jewish Health Policies & Guidelines