THE 131I-TRIIODOTHYRONINE-RESIN UPTAKE TEST

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Abstract
SUMMARY: The results of 450 131I-triiodothyronine (T3)-resin uptake tests in euthyroid, hyper- and hypothyroid patients are described. The effects of variation in the temperature and weight of resin on 131I-T3 uptake are demonstrated. Limits of normality have been established for a group of 149 euthyroid patients. The 131I-T3-resin uptake test in euthyroid, hyper- and hypothyroid patients has been compared with the 4 and 48 hr. 131I neck uptake, the protein-bound iodine (p.b.i.) concentration and the basal metabolic rate (b.m.r.) as a test of thyroid status. The results suggest that, as a single test for the estimation of thyroid status, the 131I-T3-resin uptake test is as reliable and more convenient than the more established test procedures.