In order to study the effect of steroids on the function of the thyroid gland, the uptake by erythrocytes of l-triiodothyronine labeled with 131I was investigated in 29 euthyroid patients treated with prednisone. At the same time the thyroid function was studied by determinations of the serum PBI, the thyroid 131I-uptake and the thyroid hormone secretion rate. In addition some studies of the renal 131I-clearance were performed. Prednisone was found to increase the erythrocyte uptake of the thyroid hormone triiodothyronine in two-thirds of the patients investigated probably as a result of decreased binding capacity of the serum proteins. Simultaneously, the function of the thyroid gland was found to decrease, according to the thyroid 131I-uptake and the thyroid hormone secretion rate.
A slightly increased renal 131I-clearance was found during the steroid treatment. This increase cannot completely explain the decreased thyroid 131I-uptake
The relation between the decreased function of the thyroid gland and the increased uptake of triiodothyronine in erythrocytes during steroid treatment is discussed.
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