Understand Your Test

Free T4

Formal Name

 

Free Thyroxine

 

Why Get Tested?

To help evaluate thyroid gland function; to help diagnose thyroid disease; to screen for hypothyroidism in newborns; to monitor effectiveness of treatment.

When To Get Tested?

When you have signs and symptoms of thyroid disease, usually after an abnormal result on a TSH test; commonly performed as a screening test on newborns soon after birth; when you are being treated for a thyroid disorder.