Hepatitis B Antigen usually refers to Hepatitis B surface antigen, which is a key marker used to detect infection with Hepatitis B.
What HBsAg means:
Positive (Reactive):
Indicates current Hepatitis B infection
Could be acute (recent) or chronic (long-term)
Negative (Non-reactive):
No current infection detected
However, it doesn’t rule out past infection or immunity (other tests may be needed)