[Thyroid function in the euthyroid elderly subject: evidence of low T3 syndrome].

The presence of a low T3 syndrome was confirmed in elderly euthyroid patients. The condition is characterised by lower circulating total (TT3) and free triiodothyronin (FT3) than in adults with no clinical symptoms of hypothyroidism. A total of 133 subjects over 65 were studied as we used 204 adult controls aged 18-65.