Viral IgG Antibody to Cytomegalovirus (CMV) in Serum/Plasma

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms of CMV infection (such as fever, fatigue, or organ-specific issues), if you’re immunocompromised (e.g., due to HIV, chemotherapy, or organ transplant), or if you’re at risk for CMV-related complications. It can also be used in pregnancy to check for CMV exposure in the mother.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The test is quick and typically painless. If you’re pregnant or have a history of bleeding disorders, let your provider know before the test.

What the Test Results Mean

Positive results indicate you’ve likely been exposed to CMV and developed antibodies to fight it. Negative results suggest you either haven’t been exposed or your immune system hasn’t mounted an antibody response yet. Results don’t confirm active infection but can guide further testing if needed.

Common Reasons for Testing

This test is often used to monitor CMV in people with weakened immune systems, evaluate congenital CMV in newborns (if the mother tested positive), or assess risk for CMV transmission in pregnancy.