Serum ratio of triiodothyronine to thyroxine, and thyroxine-binding globulin and calcitonin concentrations in Graves' disease and destruction-induced thyrotoxicosis

The Journal of Clinical Endocrinology and Metabolism
N AminoK Miyai

Abstract

The serum ratios of T3 to T4, and T4-binding globulin (TBG) and calcitonin concentrations were studied in cases of thyrotoxic Graves' disease and destruction-induced thyrotoxicosis. In 272 patients with Graves' disease, 209 of 240 (87%) untreated patients without complications had high T3 to T4 ratios (nanograms per micrograms) of more than 20. Six of 32 (19%) patients with Graves' disease who had complications (15 with pregnancy, 14 with increased TBG, and 3 with conditions associated with a low T3 syndrome) had high T3 to T4 ratios. Eleven of 74 (15%) patients with destruction-induced thyrotoxicosis (24 with subacute thyroiditis, 39 with postpartum transient thyrotoxicosis, and 11 with spontaneous transient thyrotoxicosis) had high T3 to T4 ratios. Patients who had serum T4 levels of more than 30 micrograms/dl and/or T3 levels of more than 800 ng/dl had Graves' disease. There was no significant correlation between the T3 to T4 ratio and activities of thyroid-stimulating immunoglobulins in thyrotoxic patients with Graves' disease who had no complications. The average serum levels of TBG in destruction-induced thyrotoxicosis and thyrotoxic Graves' disease were 20.7 +/- 4.3 micrograms/ml (mean +/- SD; n = 22), and 19.9 +/- 4.0 (...Continue Reading

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