[Criteria of the test of suppression of thyroid uptake of I131 by triiodothyronine].

The author assessed the results of the test of the triiodothyronine (T3) suppression of the I131 absorption in 10 healthy women, 22 suffering from neurocirculatory dystrophy and 35 patients with diffuse toxic goiter. This test was found to distinctly differentiate the patients with diffuse toxic goiter and healthy persons. Reduction of absorption to the level below 15% of the indicator dose with consideration to the level of the initial absorption could be considered as criterion of the normal I131 absorption in response to the T3 administration. The mean suppression of the absorption in T3 administration in patients with neurocirculatory dystonia (10.7 +/- 1.49%) displayed a significant difference from the level of mean suppression of the absorption in patients with diffuse toxic goiter (58.1 +/- 4.76%). However, in individual patients suffering from neurocirculatory dystonia the I131 absorption by the thyroid gland in T3 administration still exceeded such in healthy persons. Therefore such patients require further observation because of a possible development in them of diffuse toxic goiter.