Cytomegalovirus IgG Avidity (CMV)

The Cytomegalovirus IgG (CMV) avidity test is a diagnostic tool that provides important information about a patient’s health. At IntroLab in Belgrade, our expert team is committed to delivering accurate and reliable results for this and many other tests.

What is Cytomegalovirus IgG Avidity (CMV)?

Cytomegalovirus (CMV) is a common virus that can cause a wide range of symptoms, from mild to severe. When someone is initially infected with CMV, the immune system generates specific antibodies – IgM and IgG. Avidity measures the strength of the bond between these antibodies (IgG) and the CMV antigen. CMV IgG avidity testing helps doctors determine whether an infection is recent (low avidity) or older (high avidity).

Why is Cytomegalovirus IgG Avidity (CMV) measured?

Measuring CMV IgG avidity is important for several reasons:

• Helps diagnose CMV infection: IgG avidity testing can distinguish between a recent primary infection and a past infection.
• Essential for pregnant women: CMV can lead to complications if a first-time infection occurs during pregnancy. The avidity test assists doctors in determining the timing of the infection, which is critical for assessing the risk to the fetus.

When is this test necessary?

The Cytomegalovirus IgG (CMV) avidity test is typically recommended in the following cases:

• When a patient shows symptoms that could suggest a CMV infection.
• If a CMV IgM antibody test is positive, to determine if the infection is recent.
• For pregnant women who test positive for CMV IgM, to assess whether the infection is recent.

How are the results interpreted?

Results of the CMV IgG avidity test are generally categorized as low, borderline, or high:

• Low avidity typically indicates a recent, primary infection.
• High avidity points to an older infection.
• Borderline results may require a follow-up test.

A doctor should interpret the results in the context of the patient’s overall clinical picture and other laboratory findings.

Preparation for Cytomegalovirus IgG (CMV) Avidity test

No special preparation is necessary for this test. It’s important to inform your doctor about any medications you are taking, as they may influence the test results.

Test specifics and types

This test is often paired with other tests, such as CMV IgM and IgG antibody tests, to provide a comprehensive diagnosis and evaluation.