Abstract

Triiodothyronine (T3) and Thyroxine (T4) were measured in women after delivery, in the cord blood of their children and in the first days of life. Furthermore TSH was determined in the cord blood. Women immediately after delivery showed T3 and T4 concentrations in the upper normal range. In the cord blood T4 was normal, TSH elevated (9.2±7.4 uU/ml) and T3 in the hypothyroid range (0.5±0.17ng/ml). T3 increased to normal concentrations in most cases within 24 hrs; possible explanations of the low T3 levels under fetal conditions are discussed.

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