Thyroid Function and Metabolic State in Chronic Renal Failure

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Abstract
Thirty-eight patients with chronic renal insufficiency who were in a dialysis program underwent studies of thyroid function and metabolic status. Mean values for serum total and free thyroxine (T4) concentrations and thyroxine-binding globulin capacity were within normal limits. Although mean serum total triiodothyronine (T3) concentration was normal, 43% of the group had low serum T3, and 54% had low serum free T3 concentrations. Serum thyrotropin (TSH) concentrations were normal in all but 4 subjects who had very slight elevations. Metabolic status was assessed by various metabolic tests; mean values for each of these tests were normal, and the clinical index scores indicated that all patients were euthyroid. Results of metabolic testing were similar in patients with low and those with normal serum T3 concentrations. Low serum T3 measurements did not accurately reflect metabolic state in patients with chronic renal failure; serum free T4 and TSH concentrations were reliable indicators of thyroid state.

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