<prompt> What is the best time to screen for neonatal hypothyroidism1 - 2 days after birth2 - 4 days after birth1 - 2 has after birth2 - 4 has after birth  <response>: At birth, due to stress TSH level increases till 3 days72 hours , By 72 days TSH becomes normal. Hence best time to screen is after 3 days i.e 2 - 4 days after birth. 