COVID-19 Antibody Tests

COVID-19 serological tests identify early- and late-stage antibodies against this virus that are present in the blood. These tests show two types of antibodies: the early type called IgM and the late-type, called IgG. This test is best used to discover if someone is going through, or has gone through the infection and has already recovered. It is less reliable in detecting an ongoing infection in asymptomatic, or mild-onset, than the PCR test.