CYTOMEGALOVIRUS IGM, SERUM

Cytomegalovirus IgM, Serum

What it is

The Cytomegalovirus (CMV) IgM, Serum test detects IgM antibodies against CMV, a common herpesvirus that can cause mild illness in healthy individuals but serious complications in newborns, pregnant women, and immunocompromised patients. IgM antibodies usually appear soon after infection, making this test useful for identifying recent or acute CMV infections.

Uses

This test is used to diagnose recent or active CMV infections, particularly in pregnant women, transplant recipients, and immunocompromised patients. It is often ordered alongside CMV IgG and PCR tests to confirm the timing and stage of infection. Monitoring IgM levels can also help distinguish between primary infection and reactivation.

Symptoms That May Lead to the Test

Doctors may recommend this test if you experience fever, fatigue, sore throat, swollen lymph nodes, or mononucleosis-like symptoms. It is especially important for pregnant women (to assess risk of congenital CMV), HIV-positive individuals, and organ transplant patients who may face severe complications from CMV.

Abnormal Results

Positive CMV IgM: Suggests a recent or active CMV infection. In pregnant women, this result requires further confirmation since primary CMV infection may pose risks to the fetus.

Negative CMV IgM: Suggests no evidence of recent infection. However, CMV IgG testing may still be necessary to determine past exposure or immunity status.

Risks

The test requires a standard blood draw. Risks are minimal and may include mild pain, bruising, or dizziness at the puncture site. These side effects are uncommon and temporary.