This test measures the levels of specific antibodies, known as immunoglobulins, in your body. Immunoglobulins are proteins produced by your immune system to help fight off infections caused by bacteria, viruses, and other harmful invaders. By evaluating these antibody levels, the test helps assess how well your immune system is responding to potential threats. Low levels of immunoglobulins may indicate a weakened immune system, increasing the risk of infections, while elevated levels could suggest an overactive immune response, possibly linked to allergies or autoimmune conditions.