"IgG" refers to immunoglobulin G, which is a type of antibody produced by the immune system in response to infections or other foreign substances. When you see "Anti-Phospholipid Antibody IgG," it means that the testing has detected the presence of immunoglobulin G antibodies specific to phospholipids in the blood. Elevated levels of Anti-Phospholipid Antibody IgG can be indicative of antiphospholipid syndrome, which may require further evaluation and medical management.