11<\/a><\/sup>.\u00a0\u00a0\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\nBlood tests\u00a0are used to\u00a0detect hepatitis B markers such as HBsAg and other antibodies. Together,\u00a0these\u00a0tests help doctors understand whether the infection is new (acute) or long-term (chronic), how active the virus is, and whether\u00a0Hepatitis B\u00a0treatment\u00a0is needed4<\/a>,5<\/a><\/sup> Blood tests can also show if a person is immune due to vaccination or past infection5<\/a><\/sup>.\u00a0\u00a0<\/p>\n\n\n\n