LabwiseFree T3pg/mL
Free T3 is the unbound, active form of the thyroid hormone triiodothyronine.
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What Free T3 measures
Free T3 is the unbound, active form of the thyroid hormone triiodothyronine.
If your Free T3 is low
Free T3 below the range can follow illness, fasting or an underactive thyroid.
Commonly associated with
- Severe illness
- Fasting or low calorie intake
- Underactive thyroid
If your Free T3 is high
Free T3 above the range is commonly associated with an overactive thyroid.
Commonly associated with
- Overactive thyroid
- Thyroid medication
- Biotin supplements affecting the assay
Typical reference range
| Group | Typical range |
|---|---|
| Adults | 2 – 4.4 pg/mL |
Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.
If it is within range
Your free T3 is within the range printed by your lab.
Also listed as
T3, Free, Triiodothyronine (T3), Free, FT3, Triiodothyronine,Free,Serum
Related tests
This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.