Thyroxine, Free T4F

Method(s) Chemiluminescent Immunoassay
Specimen Required
Collect

One 5 mL gold (SST) top tube. Also acceptable: Lithium heparinized plasma, EDTA plasma

Transport

1 mL serum at 2-8ºC (Min: 0.5 mL)

Stability

Ambient: 8 hours; Refrigerated: 2 days; Frozen: 1 month

Schedule Daily
Billing Code 1010074
CPTCode 84439
Preferred Specimen Collection Device(s)
Reference Interval
21 years and older0.89 - 1.76 ng/dL
13 - 20 years0.83 - 1.43 ng/dL
2 - 12 years0.86 - 1.40 ng/dL
0 - 23 months*0.94 - 1.44 ng/dL

* Reference range is applicable for infants 30 days and older. Neonatal reference range has not been established for this method.

No Appointment Necessary
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11 Patient Service Centers in Central New York.

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