What does CMV IgM positive mean?
Positive CMV IgM results indicate a recent infection (primary, reactivation, or reinfection). IgM antibody responses in secondary (reactivation) CMV infections have been demonstrated in some CMV mononucleosis patients, in a few pregnant women, and in renal and cardiac transplant patients.
What does CMV IgG positive and CMV IgM negative mean?
A high level of IgG is not as important as a rising level. If there is a 4-fold increase in IgG between the first and second sample, then you have an active CMV infection (primary or reactivated). A positive CMV IgM and negative IgG means you may have very recently been infected.
What happens if cytomegalovirus IgG is high?
Also, if your IgM and IgG levels are high, it may mean you have CMV. Your healthcare provider will likely give you the test again in 2 weeks to confirm the infection. If your IgG levels rise between the first and second test, that may mean you have an active infection.
How long CMV IgM stay positive?
If positive, the infection may be current, usually sometime within the last 4 months. CMV IgM antibody in some women may remain positive for over 4 months (sometimes up to a year or more) or may be a false positive result.
How long does CMV IgG stay positive?
CMV IgM antibody in some women may remain positive for over 4 months (sometimes up to a year or more) or may be a false positive result. Therefore, a third CMV antibody test may be performed, called CMV IgG avidity index.
How long does CMV stay active?
More than half of adults have been infected with CMV by age 40 but most don’t know they’ve been infected. Once you’re infected with CMV, it stays in your body for the rest of your life.
Should I worry about CMV?
CMV infection usually isn’t harmful in healthy adults or children because their immune system protects their bodies from infection. But CMV can cause serious health problems for some, including: Babies who get infected before birth.