Antibody to Flavivirus Nucleocapsid Protein (IgG) - Serum

What This Test Measures

The test looks for IgG antibodies specific to the nucleocapsid protein of flaviviruses. Flaviviruses are a group of viruses that can cause serious illnesses, including dengue fever, yellow fever, and Zika virus disease. These antibodies develop after your body has encountered the virus, often months after infection. This test is not used to diagnose an active infection but rather to confirm past exposure or immunity.

Why It’s Ordered

Your healthcare provider may order this test if you have a history of flavivirus exposure, travel to regions where these viruses are common, or if you have symptoms suggestive of a past infection (e.g., fever, rash, joint pain). It may also be used in research or epidemiological studies to track virus spread.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The blood is processed to separate serum (the liquid part without blood cells), which is then tested. You may feel a slight pinch when the needle is inserted, but the procedure usually takes less than five minutes.

What to Expect Before the Test

No special preparation is needed for this test. You can eat, drink, or take medications as usual. If you are on blood-thinning medication, let your healthcare provider know before the test.