Cat scratch fever laboratory tests

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

• Complete blood count and differential count - lymphocytosis is seen in the acute phase.
• Erythrocyte sedimentation rate - elevated.
• Serological testing (indirect immunofluorescence or enzymatic immunoassay with titration of IgG or IgM antibodies) - to detect serum antibody to B henselae.
• Polymerase chain reaction (PCR) is the most sensitive test and is able to differentiate between different Bartonella species, as well as subspecies and strains.