Аннотация:ABSTRACT Serum triiodothyronine (T 3 ) concentrations have been measured in 7 patients with euthyroid endocrine exophthalmos and in 8 patients with hyperthyroidism. These results have been assessed in relation to other tests of thyroid function. The non-suppressibility of euthyroid endocrine exophthalmos is due to elevated endogenous T 3 levels and correlated to a negative response of the pituitary gland to TRH. In hyperthyroid patients who are euthyroid under antithyroid drug therapy, no general correlation of routine laboratory data with T 3 levels, suppressibility and TRH response could be found. There is a gap between normal T 3 and T 4 levels and the restoration of the normal TRH response. A condition is described in which euthyroid patients show thyrotoxic behaviour of the pituitary receptors.
