What do my test results mean? Test results may vary depending on your age, gender, health history, and other things. Your test results may be different depending on the lab used. They may not mean you have a problem. Ask your healthcare provider what your test results mean for you. Results are given in amounts of 2 kinds of antibodies: immunoglobulin M (IgM) and immunoglobulin G (IgG). The test is positive if IgM antibodies are present. But this only means that you have been infected with CMV at some time in your life. It does not tell when the infection happened. 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. The fact that your IgG level increases is more important than the amount of IgG found. The increase shows that your immune system is busy fighting an infection and that the antibodies are not just leftover from an earlier fight.