Chronic hepatitis B (CHB): Defined as the presence of HBsAg on at least one occasion, and for adolescents and children, persistence of HBsAg for six months or more. The ULN for ALT have been defined as <30 U/L for men and boys and <19 U/L for women and girls for consistency. Some guidelines use different ULN ALT levels for adolescents and children (<22 U/L for girls and <25 U/L for boys). Raised ALT may normalize in pregnancy and is therefore not a good marker for deciding about long-term treatment in pregnancy. Pregnant women should be reassessed after delivery.