[Early detection of congenital hypothyroidism. Study of 31,609 determinations]

As a result of congenital hypothyroidism (CH) early detection program carried out in our clinic during the period 1978-1981, 31.609 capillary blood samples (35,7% from newborn infants) were taken on filter paper cards. An evaluation of TSH following the specific radioimmunoanalysis technique was made in all the samples, and an evaluation of T4 whenever TSH values were higher than 25 microU/ml serum. Thirteen cases of CH were detected: nine with permanent H and four with transient H. Two cases of hyperthyrotropinemia were also detected. Frequency of permanent CH in our population is of 1/3.512. Corresponding biochemical data and detailed clinical characteristics detected, including the cost of the procedure are shown. Authors emphasize on possibility of preventing brain damage and subsequent subnormality through early detection and treatment of congenital hypothyroidism, together with a suitable cost-benefit ratio, makes necessary to carry out a nationwide campaign in accordance with those centers already established.