<prompt> Screening of neonatal thyroid disease is done byT4T3TSHTPO antibodies  <response>: Since the neonates are asymptomatic at bih all newborns are screened for neonatal hypothyroidism. TSH is estimated either in cord blood at the time of bih preferred or blood obtained from heel prick after 2 days of bih.Refer: Nelsons Textbook of Pediatrics, SAE, 1st edition, pg no. 2669 - 2773 