Clarilab

Thyroid

T4 (total) test

Total thyroxine, bound and free.

Typical range
About 5–12 µg/dL.
Usual recheck
About 2 months when out of range

Why it's done

Part of a thyroid profile.

What a high result can mean

Overactive thyroid; also higher in pregnancy.

What a low result can mean

Underactive thyroid.

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More thyroid tests

TSHThe brain's signal to the thyroid. It moves opposite to thyroid hormone. Free T4The active, unbound form of the main thyroid hormone. Free T3The most active thyroid hormone. T3 (total)Total T3 hormone, bound and free. Anti-TPO antibodiesAntibodies against the thyroid gland.