Undiagnosed congenital hypothyroidism in a newborn treated with dopamine infusion

: Medications administered during the neonatal period may mask the diagnosis of congenital hypothyroidism. Herein, we report a case of undiagnosed congenital hypothyroidism while the infant was on treatment with dopamine. Given the inhibitory effect of dopamine on thyroid-stimulating hormone, a high index of suspicion for potential congenital hypothyroidism is needed in such neonates.