Cytomegalovirus (CMV) Antibody Test (IgG) - Plasma/Serum

What Does This Test Measure?

The test detects immunoglobulin G (IgG) antibodies to CMV in your blood. IgG antibodies are produced by your immune system after an initial infection or following recovery. They remain in your blood for a longer period and can indicate past exposure to CMV.

Why Might You Need This Test?

Doctors may order this test if you have symptoms of CMV infection (such as fever, fatigue, or swollen lymph nodes), if you’re at high risk for CMV (like pregnant women, organ transplant recipients, or people with weakened immune systems), or if you’re being evaluated for immune-related conditions.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The blood is then sent to a lab for testing. The lab uses an immunoassay method to detect CMV-specific IgG antibodies in your plasma or serum.

What Are the Results Typically Used For?

Positive results suggest you have developed immunity to CMV, either from past infection or vaccination. Negative results mean you likely haven’t been exposed to CMV recently or have no detectable antibodies. This information helps guide medical decisions, such as monitoring for infection or planning preventive measures.