Zika Virus IgG Antibody (Serum/Plasma) – Confirmatory Test

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like fever, joint or muscle pain, rash, or neurological issues (e.g., confusion, seizures) that could suggest Zika virus exposure, especially if you traveled to or lived in an area with active Zika transmission. It may also be used in research or for monitoring in high-risk populations.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted to draw blood from a vein, usually in your arm. The process takes about 5 minutes. You may feel slight discomfort, but it’s usually brief.

What the Test Results Mean

Positive results indicate the presence of IgG antibodies, suggesting you likely had Zika virus infection at some point. Negative results mean no detectable IgG antibodies were found, so past infection is unlikely. False negatives can occur if tested too soon after exposure.

Common Causes of Positive Results

A positive result is most reliable if tested at least 6–12 weeks after possible exposure, as IgG antibodies take time to develop. False positives can rarely occur with other infections (e.g., dengue, yellow fever) or cross-reactions, so confirmatory testing is used to rule these out.