Free T4
Thyroxine (T4) is one of the two main hormones the thyroid gland makes.
Why it matters: Too many or too few thyroid hormones may mean a person has thyroid disease.
Source · Cleveland Clinic — what it is, why it matters
Reference Range
12.0 – 22.0pmol/L
1222LowNormalHigh
Common questions
What is Free T4?
Thyroxine (T4) is one of the two main hormones the thyroid gland makes.
What might a high or low Free T4 mean?
Too many or too few thyroid hormones may mean a person has thyroid disease.
What is the typical reference range for Free T4?
The general-population reference range shown here is 12 – 22 pmol/L. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.
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