ClarilabThyroid
Free T3 test
Also called FT3
The most active thyroid hormone.
- Typical range
- About 2.3–4.2 pg/mL.
- Usual recheck
- About 2 months when out of range
Why it's done
Mainly used when an overactive thyroid is suspected.
What a high result can mean
Overactive thyroid.
What a low result can mean
Underactive thyroid or a long illness.
Got a report with Free T3?
Upload the PDF to Clarilab: it reads the values in your browser, flags anything out of range and tracks your results over time.