Cytomegalovirus (CMV) Antibody, IgG, Serum/Plasma

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of CMV infection, such as fever, fatigue, or swollen lymph nodes, especially if you have a weakened immune system. It may also be used to check for past infection in individuals who are at higher risk, like organ transplant recipients or those with HIV/AIDS. Additionally, it can help monitor immunity in people who have received CMV vaccines or have been exposed to the virus.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into a vein in your arm, or a blood sample may be collected from your finger. If you’re taking blood from a vein, you might feel a brief pinch or sting. If you’re uncomfortable with needles, let your healthcare provider know.

What the Test Results Mean

A positive result means you have IgG antibodies to CMV, suggesting you’ve had the virus at some point or have immunity. A negative result means you likely haven’t had the virus recently or have no detectable IgG antibodies. However, a negative result doesn’t always mean you’re completely protected, especially if you’re at high risk for infection.

Possible Results and Next Steps

If your test is positive, your healthcare provider may recommend further testing to check for active infection or to monitor your immune status. If you’re negative and at high risk (e.g., transplant recipient), they may recommend retesting or preventive measures. Follow-up may also involve discussing vaccination options or managing symptoms if applicable.