The Bartonella ImmunoBlot test is designed to detect IgG and IgM antibodies to Bartonella species including Bartonella henselae, B. quintana, B. elizabethae, and B. vinsonii antigens in the serum of patients suspected of having Bartonella infection. For diagnostic purposes, the Bartonella ImmunoBlot test results should be used in conjunction with clinical symptoms and other evidence available to the diagnosing practitioner. This test is unavailable for patients over 65 when ordered through physician services.