T3 inhibition test

After taking exogenous T3 in normal people, the T3 concentration in the blood increases, and through negative feedback, TSH secretion in the anterior pituitary gland can be suppressed, and the thyroid uptake 131I rate is significantly reduced. Patients with diffuse goiter with hyperthyroidism, due to the presence of long acting thyroid stimulator (LATS) and long acting thyroid stimulator protection in the blood, can stimulate the thyroid gland to cause an increase in 131I, and it is not affected by T3 inhibition. The thyroid iodine 131 iodine function test sometimes overlaps in the values ​​of normal people and hyperthyroidism, which affects the diagnosis of the disease.

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