Levels of TRAb in cord blood should be determined as soon as possible to allow discharge of infants with negative antibodies.

Determination of thyroid function from the cord is not indicated as there is no evidence to suggest that these levels predict neonatal hyperthyroidism.

In infants considered high risk, repeat thyroid function testing, in addition to physical examination is recommended.

Recommendation

Blood tests to be carried out as follows:

  • Delivery: Cord blood for TRAb only.
  • Day1: TRAb if not done from cord blood.
  • Day 3-5: fT4 and TSH.
  • Day 10-14: fT4 and TSH.