Optimal timing of hepatitis B virus DNA quantification and clinical predictors for higher viral load during pregnancy.

HBV DNA quantification should be performed before 22 weeks of gestation. Viral load cut-offs similar to those at 28 weeks can be used to determine immunoprophylaxis failure at earlier gestation. Maternal positive HBeAg status was associated with a higher chance of viral load >6, 7 or 8 log10  IU/mL.