Lab reference

Free T3

Thyroid

For education. Check every result.

Anatium is a study resource, not medical advice. Nothing here is a diagnosis, a prescription or a substitute for a clinician who has seen the patient. Check every number against a current local protocol before it touches anyone, and never act on a result you cannot reproduce yourself.

Reference range

Range2.3 to 4.2 pg/mL

About

The more active thyroid hormone, useful when TSH is low but free T4 is normal.

When it is low

Hypothyroidism, sick euthyroid, T4 to T3 conversion issues

When it is high

Hyperthyroidism, T3 toxicosis, early Graves disease

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