• Hepatitis B
  • Pregnancy, Perinatal & Infants

Do people who have been vaccinated previously against HBV infection still need to be screened during pregnancy?

Yes. Mothers who have received HepB should still be screened for HBsAg early in each pregnancy. Just because a pregnant person has been vaccinated does not mean they are HBsAg negative. Since postvaccination testing is not performed for most vaccinated people, the mother could have been vaccinated when already actively infected.

Last reviewed: July 21, 2023

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