Your Hepatitis B Surface Antibody Can Vanish Over Time, Yet You May Still Be Protected
A positive hepatitis B surface antibody (anti-HBs) test generally means your immune system can fight off the hepatitis B virus, whether from vaccination or a past infection you've already cleared. But here's where it gets interesting: that antibody level can fade to undetectable over the years, and you might still have protection thanks to immune memory. On the flip side, some people who do have detectable anti-HBs carry antibodies that lack real neutralizing power. The point is that this single lab value tells you a lot, but not everything. Its meaning shifts dramatically depending on what other markers show up alongside it, your clinical history, and your immune status.