A 7-year study on the prevalence of congenital hypothyroidism in northern Iran.

Background: Congenital hypothyroidism (CH) is one of the most common congenital endocrine disorders.The present study determined the prevalence and demographic characteristics of congenital hypothyroidism in the north of Iran.

Objective: To determine the prevalence of congenital hypothyroidism based on transient and permanent types with demographic characteristics in Mazandaran province in northern Iran.