Fluorescent Immunoassay for Viral IgG Antibodies (e.g., Influenza A/B)

What This Test Measures

The test detects IgG antibodies, a type of protein your immune system creates after encountering influenza viruses. These antibodies remain in your blood long after the initial infection has passed, marking your body’s memory of past exposure.

Why It’s Done

Doctors may order this test to assess whether you’ve had flu viruses (A or B) in the past, especially if you’re at higher risk for complications or need guidance on vaccination history.

Sample Collection and Process

A blood sample is taken from your arm, and the serum is tested using a fluorescent immunoassay. This method detects specific antibody markers that indicate prior exposure without directly identifying the virus.

What the Results Mean

Positive results suggest you’ve likely been exposed to influenza viruses at some point, but they don’t confirm recent infection. Negative results mean no detectable antibodies, indicating either no prior exposure or recent infection that hasn’t yet developed antibodies.