Long thyroid stimulating agent is
Answer is option 2, antibody to thyroid receptors. Thyrotropin receptor (TSHR) antibodies that stimulate the thyroid (TSAb) cause Graves' hypehyroidism and TSHR antibodies which block thyrotropin action (TBAb) are occasionally responsible for hypothyroidism. Unusual patients switch from TSAb to TBAb (or vice versa) with concomitant thyroid function changes. We have examined case repos to obtain insight into the basis for "switching."
Antibody to thyroid globulin
Antibody to thyroid cell receptors
Antibody to thyroxine
Antibody to thyroid cells
Endocrinology