our regional cord blood screening programme for detecting neonatal hypothyroidism using initial cord blood thyroxine ( t4 ) determinations , with supplemental thyrotropin ( tsh ) , and triiodothyronine resin uptake ( t3u ) measurements , gave an incidence of thyroid abnormalities of 1/3000 births , with 1/5000 infants having severe primary hypothyroidism .
C0020676
hypothyroidism
C0040165
thyroxine