This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Pediatrics
Screening of neonatal thyroid disease is done by - 
Select and explain. 
A. T4, B. T3, C. TSH, D. TPO antibodies
C: TSH
Answer: C: TSH 
Explanation: Ans. is 'c' i.e., TSH o Since the neonates are asymptomatic at birth all newborns are screened for neonatal hypothyroidism. TSH is estimated either in cord blood at the time of birth (preferred) or blood obtained from heel prick after 2 days of birth.