Prevalence of Permanent Congenital Hypothyroidism in Children in Yazd, Central Iran.

Background: Congenital hypothyroidism is a condition of thyroid hormone deficiency. Approximately 1 in 4000 newborn infants has a deficiency of thyroid function. The aim of this study is determination of the prevalence of permanent and transient congenital hypothyroidism (CH) in Yazd, Iran.