Cytomegalovirus (CMV) IgG Antibody, Serum

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of CMV infection (such as fatigue, fever, or organ damage), if you’re at high risk for CMV (like an organ transplant recipient or someone with a weakened immune system), or if you’re planning a pregnancy and have a history of CMV exposure. It can also help monitor immune function or guide decisions about preventive measures.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into a vein in your arm, and a small amount of blood will be drawn. The process usually takes a few minutes.

What the Test Results Mean

A positive result means your body has produced antibodies against CMV, indicating past infection. A negative result suggests you may not have been exposed or your immune system hasn’t detected the virus yet. Results don’t indicate whether you’re currently infected.

Common Reasons for Testing

CMV IgG testing is often used in high-risk groups (e.g., transplant patients, pregnant individuals) to assess immunity or guide preventive strategies. It can also help diagnose or monitor conditions linked to CMV exposure.