Bartonella henselae Ab, IgG is a blood test that measures the level of IgG antibodies against the bacteria Bartonella henselae, which is commonly associated with cat scratch disease. IgG antibodies are produced by the immune system as a response to a past or ongoing infection, indicating that the person has been exposed to the bacteria. A positive IgG result suggests a previous infection with Bartonella henselae and that the body has developed immunity to it, although it may also indicate a chronic or persistent infection. Typically, this test is used to help diagnose cat scratch disease, which can cause symptoms like swollen lymph nodes, fever, and fatigue, particularly in people who have had contact with cats or have been scratched or bitten by one.
Every lab result you’ve ever had, charted and explained.
Healthmatters is a tracker for your lab results. Upload a report from any lab, any country — every marker charted and explained.
Start with my report →All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.