Triiodothyronine, Free (Free T3) T3F

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 Refrigerated: 7 days.
Schedule Daily, except Sundays
Billing Code 1010104
CPTCode 84481
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 older2.3 - 4.2 pg/mL
13 - 20 years3.0 - 4.7 pg/mL
2 - 12 years3.3 - 4.8 pg/mL
0 - 23 months3.3 - 5.2 pg/mL
No Appointment Necessary
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11 Patient Service Centers in Central New York.

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