What should a pregnant woman with hepatitis B do?

Hepatitis B is itself a contagious disease, and mother-to-child transmission is one of the most important routes of hepatitis B virus (HBV) transmission. Research shows that approximately 40% of infants born to mothers with hepatitis B become infected; if the mother is “HBsAg-positive, HBeAg-positive, and anti-HBc-positive” (commonly referred to as “Big Three-Positive”), the infection rate among newborns may exceed 90%. So, what should pregnant women with hepatitis B do? Let’s explore this together.

What Should Pregnant Women with Hepatitis B Do?

If hepatitis B infection is confirmed and pregnancy occurs simultaneously, several key measures must be taken.

First, regular monitoring is essential—including liver function tests, HBV DNA quantification, alpha-fetoprotein (AFP), and abdominal ultrasound (focusing on the liver and biliary system). When clinically indicated, liver stiffness measurement (e.g., via transient elastography) may also be performed to assess disease progression and monitor for potential HBV reactivation triggered by pregnancy.

Second, if no HBV-related disease flare occurs throughout pregnancy, antiviral prophylaxis with tenofovir disoproxil fumarate (TDF) should be considered during the third trimester—specifically between weeks 24 and 28—if maternal HBV DNA levels are ≥2 × 10⁶ IU/mL. This intervention significantly reduces the risk of mother-to-child (vertical) transmission. Additionally, the newborn should receive hepatitis B immune globulin (HBIG) within 12 hours of birth, followed by timely and standard administration of the hepatitis B vaccine. After completing this regimen, breastfeeding is safe and encouraged.

However, when the infant reaches approximately one year of age, testing for hepatitis B seromarkers (“two pairs and a half”—i.e., HBsAg, anti-HBs, HBeAg, anti-HBe, and anti-HBc) is recommended to determine whether protective anti-HBs antibodies have developed.

The above outlines key management strategies for pregnant women with hepatitis B. We hope this information is helpful to you.