[Radioimmunoassay for screening studies in the newborn].

A radioimmunological examination (screening) of hypophyseal-thyroid function in 2400 newborns within the 1st week of life revealed 111 infants with transitory forms of hyperthyroidism that was observed during the 1st month of the life. The main causes of disturbed thyroid function were endocrine diseases in mothers, a complicated course of pregnancy and delivery. It made it possible to detect not only congenital thyroid diseases but also to evaluate the function of the most important hormonal system in the adaptation of an infant in the postnatal period.