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 (Min: 0.5 mL)

Stability

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

Schedule Daily, except Sundays
Billing Code 1010074
CPTCode 84439
Notes

Results of this test may be falsely elevated in patients taking over-the-counter biotin supplements.

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 months0.94 - 1.44 ng/dL
No Appointment Necessary
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11 Patient Service Centers in Central New York.

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