Total IgG Antibody to N. meningitidis (Group B) – Serology

What This Test Measures

The test detects IgG antibodies specific to the group B meningococcal antigen. These antibodies are part of your immune response and can indicate prior exposure or vaccination effectiveness. The result is reported as a concentration of these antibodies in your blood.

Why It’s Done

Doctors may order this test if you’ve received the group B meningococcal vaccine, had recent exposure to someone with meningococcal disease, or if you’re at higher risk (e.g., travel to regions with higher infection rates, certain medical conditions). It’s also used to monitor immunity post-vaccination.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is processed to separate serum (liquid part of blood without clotting factors) for antibody testing. No special preparation is needed, but fasting is usually not required.

Interpreting Results

Results are qualitative (present/absent) or quantitative, depending on the lab’s method. A positive result means your body has produced detectable antibodies, suggesting immunity. A negative result indicates no detectable antibodies, which may mean you need booster vaccination or further testing.