Hepatitis B Surface Antibody Test
A simple home blood test using a finger prick to determine if you are immune to the hepatitis B virus.
Hepatitis B surface antibody (anti-HBs): The presence of anti-HBs is generally interpreted as indicating recovery and immunity from hepatitis B virus infection. Anti-HBs also develops in a person who has been successfully vaccinated against hepatitis B.
What Is the Definition of Hepatitis B Surface Antibody?
When you are exposed to HBV, your immune system initiates an attack to precisely target and eliminate the invader. This sort of immunity (called acquired immunity) is disease-specific, as opposed to innate immunity, which mounts a universal defense against all invaders.
This immune response happens regardless of whether you are exposed to HBV by blood or sexual contact, or if you are immunized with the hepatitis B vaccine.
Antigens are proteins on the virus's surface that act as unique identifying marks. When HBV enters the body, the immune system "encodes" antibodies specific to these antigens so that the virus may be recognised and attacked if it resurfaces.
The Goal of the Test
The HBsAb test measures the presence and amount of HBV antibodies in your blood to evaluate your level of immunity to the virus.
It might be used to search for past HBV exposure (and to tell how recent it was). A healthcare practitioner can also use the test to track your recovery from an acute HBV infection by comparing IgM and IgG levels.
Furthermore, the HBsAb test can identify whether your hepatitis B immunisation was effective and whether you require a booster vaccine (given that HBV antibodies can drop beneath protective levels over time).
CAUTION: This is VENOUS only test. You will need a medical professional to take your blood sample.