Anti-TSH receptor antibody examination was performed in patients with Basedow-Graves' disease (141 patient: 34 before treatment, 49 during medicamentous therapy, 55 in stable remission and 3 with spontaneous hypothyroidism). The following findings were found: anti-TSH receptor antibodies were positive in 87% of untreated patients; in patients with medicamentous therapy they are in correlation with the metabolic status of the patients; only in 2% of patients in remission findings were high; all of the three patients with spontaneous hypothyroidism have had high titer. Findings of the thyroid microsomal antibodies don't have such regularity: the results were high in 67% of untreated patients; were in correlation with functional status during therapy; highly present in remission (62%) and have high titers in spontaneous hypothyroidism. The gathered results confirm opinions that anti-TSH receptor antibodies are highly etiopathogenetically significant in autoimmune hypothyroidism, but underline that the finding of thyroid microsomal antibodies is not clear enough.