thyroxine

thyroxine

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Plasma thyroxine ranges between 70-150 nomol per litre and may be measured by radioimmunoassay. It is a very good screening test for primary hypothyroidism where it is lowered. It is elevated in hyperthyroidism.

Last reviewed 01/2018

Links:

thyroid hormone function
reference range (thyroxine)
clinical conditions requiring adjustment of thyroxine dose
T4, total, raised
T4, total, reduced
free T4
thyroid disease diagnostic algorithm
drugs affecting thyroxine (levothyroxine) dosage
pharmacokinetics of thyroid hormones (T3 and T4)

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