[Transient hypothyroidism in 8 low birth weight newborns. Role of topical application of iodine chemicals].

Very low plasma levels of thyroxine with a parallel decrease in the free thyroxine index were observed in 8 low birth weight infants. The tri-iodo-thyronine levels were slightly but significantly reduced and there was a concommitant increase in thyrotropin concentrations. The abnormalities, which were usually seen between the 10th--45th day, were transitory and resolved completely. The possible role of topical iodinated products is discussed.