The igg immunoglobulin in Delhi Test is a blood test that measures the levels of immunoglobulin G. It is a crucial antibody responsible for long term immunity against infections. You need to know that the antibodies are present in the blood and play a very important role in defending your body against bacteria, toxins and viruses. The antibodies provide you with long lasting immunity against diseases and also help in protecting you from recurrent infections. The increased levels might indicate a recent or a past infection. The tests can help in diagnosing some infectious diseases. The immunoglobulin igg test in Delhi can also understand the immune systems response two vaccines and can detect immunodeficiencies or autoimmune conditions.