Antibody to Flavivirus (e.g., Dengue, Yellow Fever) by Immunoassay (Serum/Plasma)

Why This Test Matters

Flaviviruses are mosquito-borne viruses that can cause severe illness. Antibodies to these viruses appear in your blood after infection, usually within weeks to months. This test helps doctors confirm if you’ve had an infection or been exposed, which is important for diagnosis, especially in areas with active outbreaks or for travelers returning from high-risk regions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm. The test is usually done in a lab and results are ready within a few days to a week, depending on the lab.

How the Test Works

The test uses an immunoassay method to detect specific antibodies in your blood that target flavivirus proteins. These antibodies are your body’s immune response to past infection. The test measures the presence and level of these antibodies to determine exposure.

Possible Results and Their Meaning

A positive result indicates you likely had an infection with a flavivirus in the past. A negative result means you probably did not have an infection recently, but it could also mean you were infected long ago and your body cleared the antibodies. False negatives can occur if tested too soon after exposure.