Normal immunoglobulin is a type of protein that plays a crucial role in the body's immune system, helping to fight off infections and diseases. Synonyms for the term 'normal immunoglobulin' include immunoglobulin G (IgG), IgG antibodies, and gamma globulin. These terms refer to the same type of protein and can be used interchangeably. Additionally, there are other types of immunoglobulins, such as IgA, IgM, and IgE, that also play important roles in the immune system. Normal immunoglobulin is commonly used in the treatment of various conditions, including immunodeficiencies, autoimmune diseases, and certain infections.