Appropriate Tests


If the free thyroxine index is used in the initial assessment of thyroid function, some euthyroid patients show increased levels however Thyroid stimulating hormone and Free T4 are normal. If the patient is clinically euthyroid, the raised free thyroxine index is of no clinical significance.

Hereditary excess of TBG


Familial dysalbuminaemic hyperthyroxinaemia


Familial prealbumin hyperthyroxinaemia