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Reduced thyroidal uptake of inorganic iodine in liver cirrhosis.

Thyroid function was investigated in patients with liver cirrhosis. 123I uptake after four hours was significantly reduced in the liver cirrhosis group (n = 19) compared with the control group (n = 16) (2.6 +/- 0.3% vs. 5.0 +/- 0.6%, mean +/- SE, p < 0.01). There was no significant difference in the blood inorganic iodine level between the two groups, and the blood 123I count after ingestion of 123I capsules was not significantly different between the two groups. The area of the thyroid was slightly smaller in the cirrhosis group. A thyroid stimulating hormone (TSH) loading test showed no significant difference in the TSH value at any time point. The serum albumin level and prothrombin time were significantly associated with the 4-hour thyroidal 123I uptake (p < 0.01, p < 0.05, respectively). We show that the thyroidal inorganic iodine uptake was reduced in patients with liver cirrhosis and this reduction correlates with the severity of liver cirrhosis. Possible mechanisms include abnormal thyroid iodine transport capacity or reduced turnover of thyroid hormones resulting in a reduction in iodine uptake in liver cirrhosis.