The Measles IgG Antibody test is a blood test that is used to detect the presence of IgG antibodies against the measles virus in a person’s blood. These antibodies are produced by the immune system in response to an infection with the measles virus or following vaccination against the virus. The test is used to determine if a person has immunity to the measles virus and can be helpful in diagnosing a current or past infection. A positive result indicates that a person has immunity to the virus, while a negative result suggests that the person is susceptible to the infection. The Measles IgG Antibody test is commonly used by healthcare professionals to screen individuals for immunity to measles and is particularly important for individuals who are planning to travel to areas where the virus is prevalent.