Cytomegalovirus (CMV) IgG Antibody, Serum/Plasma

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have concerns about CMV exposure, especially if you’re pregnant (to check for immunity before pregnancy), have a weakened immune system, or are considering organ transplantation. It can also help evaluate symptoms like fatigue, fever, or organ-related issues that might be linked to CMV.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, which usually causes only mild discomfort. If you’re pregnant or have a history of bleeding disorders, let your provider know before the test.

What the Results Mean

A positive result means you have detectable CMV IgG antibodies, suggesting you’ve likely been exposed to CMV at some point. A negative result means the antibodies aren’t present, which could mean you haven’t been exposed recently or your immune system hasn’t mounted a response yet. Results don’t indicate current infection status.

Possible Follow-Up Actions

If your results are positive, your provider may recommend additional tests to check for current infection (like CMV IgM) or monitor your immune system. If negative, they might suggest vaccination or further evaluation based on your health history and risk factors.