1 Division of Pediatrics, Michael Reese Hospital and Medical Center, Chicago, the Radioisotope Service, Veterans Administration Hospital, and the Department of Medicine, Indiana University School of Medicine, Indianapolis
The in vitro erythrocyte uptake studies of radioactive 1-triiodothyronine in 70 normal children, ranging in age from newborn infants to 13 years, are presented. The data reveal elevated uptake values in these children as compared to adults, indicating alteration in binding capacity of thyroxin-binding serum protein carriers, in all probability a reduction in thyroxin-binding prealbumin capacity.