The COVID-19 antibody GT (IgG and total) test is a laboratory test used to detect the presence of antibodies against the SARS-CoV-2 virus, which causes COVID-19, in a person's blood. This test specifically measures IgG antibodies, which are produced by the immune system in response to a previous infection or vaccination, and provides information about the overall antibody response.
The IgG component of the test focuses on detecting IgG antibodies specifically. It helps determine if a person has been exposed to the virus in the past and has developed an immune response, indicating potential immunity. IgG antibodies typically appear a few weeks after infection and may persist for an extended period.
The total antibody component of the test, as the name suggests, measures the total antibodies present in the blood, including both IgG and IgM antibodies. IgM antibodies are produced in the early stages of an infection, so their presence may indicate a more recent or active infection. Combining the measurement of IgG and IgM antibodies provides a more comprehensive understanding of the person's immune response to the virus.