Cytomegalovirus (CMV) Antibody, IgG (Serum/Plasma)

What Does This Test Measure?

The test detects IgG antibodies specific to CMV, which your immune system produces after recovering from an infection or as a sign of long-term immunity. These antibodies do not appear immediately after exposure and may take weeks to develop. This test is not used to diagnose an active CMV infection but rather to assess prior exposure or immunity.

Why Might You Need This Test?

Healthcare providers may order this test if you have symptoms suggestive of CMV infection (e.g., fatigue, fever, or organ-specific issues) or if you are at higher risk, such as pregnant women, organ transplant recipients, or individuals with weakened immune systems. It can also be used to screen blood donors or monitor immune status in certain conditions.

What Does a Positive Result Mean?

A positive result means your body has produced IgG antibodies against CMV, suggesting you have either recovered from an infection or have been exposed to the virus at some point. However, a positive result alone does not confirm an active infection; it only indicates prior exposure or immunity.

What Does a Negative Result Mean?

A negative result means your body has not yet produced detectable IgG antibodies to CMV, which could mean you have never been exposed or have been exposed recently before your blood was drawn. This does not rule out possible infection, as IgG antibodies may take time to develop.