IgG is a type of antibody that is produced by the immune system. Antibodies are proteins that help the body defend against infections and other foreign substances. IgG is the most common antibody type found in all body fluids.

IgG is important for your health because it helps protect the body against infections and diseases. When a foreign substance, such as a virus or bacteria, enters the body, the immune system produces IgG antibodies to neutralize or destroy the invader.

IgG antibodies can also protect against future infections by remaining in the body and providing immunity. This is known as acquired immunity.

There are four subtypes of IgG antibodies: IgG1, IgG2, IgG3, and IgG4. Each subtype has a specific role in the immune response and may be more or less effective against different infections.

IgG levels can be measured through a blood test called an IgG test. This test can determine the overall level of IgG in the body and can also be used to measure levels of specific subtypes of IgG. An IgG test may be ordered for various reasons, including to diagnose an immune deficiency or to monitor the effectiveness of treatment for an autoimmune disorder.

Maintaining healthy levels of IgG and other antibodies is essential to support a robust immune system and protect against infections and diseases.