ABSTRACT
Thyroid-stimulating antibody (TSAb) was measured in 16 patients with active Graves' disease based on 125I-uptake-and cAMP release of rat thyroid cell strain FRTL5 according to Marcocci and Kasagi with modifications simultaneously. With the method of 126I-uptake, TSAb was found positive in 56% of the patients and the TSAb index was 1.19; with, the method of cAMP release, these two figures were 94% and 7.11 respectively. There were very significant differences for both. The method of cAMP release was sensitive and convenient:1) the cells may multiply continuously, the IgG-may be prepared easily,and the cAMP in the medium may be measured without extraction; 2) in 35 untreated and 42 treated patients with Graves' disease, the TSAb was positive in 91 % and 50% of the cases, and the TSAb activities were 1194% and 276% respectively, the differences were also very significant.