Description
Why It’s Done:
• To determine if a person has previously been exposed to Influenza B virus.
• To assess immunity status—whether through natural infection or vaccination.
• To aid in epidemiological studies or seroprevalence surveys.
• Sometimes used in differential diagnosis when a patient has prolonged or unusual respiratory symptoms.
Note: This test is not typically used to diagnose a current infection, as IgG takes time to develop. For acute infection, Influenza A/B PCR or rapid antigen tests are more appropriate.
Preparation:
• No special preparation is required for this test.
• It involves a simple blood draw, usually from a vein in the arm.
• Inform your doctor about any medications or immunosuppressive therapy, as these can affect antibody levels.
