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Isoline · Journal · ThyroidISO-J-06

TSH and FT4: what a thyroid panel measures

TSH first, then FT4 depending on the result: how the laboratory chains the tests.

TSH

TSH is the hormone the pituitary gland uses to drive the thyroid. It is often the first test asked for, on a gold-cap tube, with no fasting.

FT4 and the others

Depending on the TSH and the prescription, the laboratory measures FT4 (the unbound thyroxine), sometimes FT3 or antibodies. When one of the laboratory's rules adds FT4 after a TSH outside the range, the report says so.

Medicines

If you take thyroid treatment, ask your doctor whether the sample should be taken before your morning dose, and note the time of your last dose.

This article informs; it doesn't replace the advice of your doctor, who interprets your results.