Efficacy of congenital hypothyroidism neonatal screening in preterms less than 32 weeks of gestational age: more evidence.

Objective: To evaluate the double screening performed for congenital hypothyroidism (CH) to preterm infants <32 weeks of gestational age (GA) between 1994 and 2003.

Infants And Methods: TSH was assessed by IFMA. Infants were classified as: term (T) (>37 weeks GA); preterm (PT) (33-37 weeks GA); and very preterm (VPT) (< or =32 weeks GA).