Cytomegalovirus IgG Blood Test in Idaho

What this test measures

Cytomegalovirus is a widespread virus in the herpes family that can cause mild or no symptoms in healthy people and can remain dormant in the body after infection. IgG antibodies appear after exposure and generally persist, so their presence usually indicates past infection. The test can be ordered alongside IgM or IgG avidity testing when a provider needs more detail about timing.

The assay uses a serum sample collected from a vein. Results are typically reported as a numerical antibody index or titer with an interpretation such as positive, negative, or equivocal, depending on the laboratory. Some evaluations add CMV IgM to look for a more recent response and IgG avidity to help estimate how long ago infection occurred.

People may order this test during pregnancy, before or after a transplant evaluation, when monitoring immune status, or when a provider wants to know whether symptoms could relate to CMV. It is also used in some donor screening contexts. A qualified healthcare provider should interpret results together with clinical history.