Thyroxine, Free T4F

Method(s) LOCI
Specimen Required
Collect

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

Transport

1 mL serum at 2-8ºC.

Stability

Ambient: 24 hours; Refrigerated: 14 days; Frozen: 3 months

Schedule Daily
Billing Code 1010074
CPTCode 84439
Preferred Specimen Collection Device(s)
Reference Interval

0.76 - 1.46 ng/dL

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

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