Hepatitis B Surface Antibody (ANTI-HBS)

The Hepatitis B Surface Antibody (Anti-HBs) test is a simple blood test used to determine whether you have protective immunity against the hepatitis B virus (HBV). It is suitable for anyone who wants to confirm their immune status, including individuals who have completed a hepatitis B vaccination course, healthcare workers, people planning travel to high-risk regions, and those who may have been exposed to the virus. The test is performed using an enzyme-linked immunosorbent assay (ELISA) or chemiluminescent immunoassay (CLIA), which accurately detects and quantifies antibodies directed against the hepatitis B surface antigen.

What the test screens for

• Hepatitis B surface antibodies (Anti-HBs): These are protective antibodies that the immune system produces in response to either vaccination or natural infection. Their presence at sufficient levels indicates immunity and protects against future HBV infection.

Why it matters

Knowing your hepatitis B antibody status is important for several reasons. If you have been vaccinated, this test confirms whether your immune response is adequate or whether a booster dose may be needed. For healthcare workers and others at occupational risk, documented immunity is often a requirement for clearance. If you have not been vaccinated, a negative result identifies you as susceptible, allowing you to take protective steps such as vaccination. In some cases, the test can also help distinguish between immunity from vaccination and immunity from past infection when interpreted alongside other hepatitis B markers. Ultimately, this test provides clarity about your level of protection and supports informed decisions about your health and safety.

• Hepatitis B surface antibody (Anti-HBs)

No special preparation required.

For blood tests, we recommend drinking plenty of water beforehand to ensure smooth sample collection. If you are taking any regular medication, continue to do so unless advised otherwise by your doctor.