HEP B SEROLOGY Flashcards
hepatitis B surface antigen (HBsAg)
A protein on the surface of HBV; it can be detected in high levels in serum during acute or chronic HBV infection. The presence of HBsAg indicates that the person is infectious. The body normally produces antibodies to HBsAg as part of the normal immune response to infection. HBsAg is the antigen used to make hepatitis B vaccine.
hepatitis B surface antibody (anti-HBs)
The presence of anti-HBs is generally interpreted as indicating recovery and immunity from HBV infection. Anti-HBs also develops in a person who has been successfully vaccinated against hepatitis B
Total hepatitis B core antibody (anti-HBc)
Appears at the onset of symptoms in acute hepatitis B and persists for life. The presence of anti-HBc indicates previous or ongoing infection with HBV in an undefined time frame.
IgM antibody to hepatitis B core antigen (IgM anti-HBc)
Positivity indicates recent infection with HBV (≤6 months). Its presence indicates acute infection.
hepatitis B e antigen (HBeAg)
A secreted product of the nucleocapsid gene of HBV that is found in serum during acute and chronic hepatitis B. Its presence indicates that the virus is replicating and the infected person has high levels of HBV.
hepatitis B e antibody (HBeAb or anti-HBe)
Produced by the immune system temporarily during acute HBV infection or consistently during or after a burst in viral replication. Spontaneous conversion from e antigen to e antibody (a change known as seroconversion) is a predictor of long-term clearance of HBV in patients undergoing antiviral therapy and indicates lower levels of HBV.
