[Discrepancies between TRH test and classical dynamic thyroid tests results in hyperthyroidism. 47 cases (author's transl)].

We have investigated the frequency of discordant results between the TRH test and classic dynamic tests of thyroid function (thyroid suppression and TSH stimulation tests) for patients presenting a diagnostic problem for hyperthyroidism. 12 patients in group I posed the problem of having a relapse of Graves' disease previously treated: a discrepancy between TRH and T3 suppression test results was observed in 17% of the cases. 10 patients in group II demonstrated the ophtalmopathy of Graves' disease without hyperthyroidism: discordance between tests results in this group was present for 20%. Finally, 25 patients in group III had a "hot" thyroid nodul apparent at thyroid scan: in 40% of the cases, the response to TRH did not lead to the same diagnosis that was suggested by the classical dynamic tests of thyroid regulation. The discrepancies observed in this work, between the results of the TRH test and those of classic dynamic tests, demonstrate that this two types of tests are not completely interchangeable, because they do not reflect exactly the same function.