What is an immunoglobulins IgG blood test? IgG is the main type of antibody found in blood and extracellular fluid, allowing it to control infection of body tissues. An immunoglobulins blood test may be used to: Check the health of your immune system if you are often sick with infections or diarrhoea. This test measures the amount of immunoglobulins in your blood. Immunoglobulins are also called antibodies. Antibodies are proteins that your immune system makes to fight germs, such as viruses and bacteria.

Immunoglobulin A (IgA) is an antibody blood protein that's part of your immune system. Your body makes IgA and other type of antibodies to help fight off sickness. Having an IgA deficiency means that you have low levels of or no IgA in your blood. If your immunoglobulin level is high, it might be caused by: Allergies. Chronic infections. An autoimmune disorder that makes your immune system overreact, such as rheumatoid arthritis, lupus, or celiac disease. Liver disease.

IgM antibodies are the first immunoglobulins your body makes after you're exposed to germs. They provide short-term protection while your body makes other antibodies. IgM antibodies are in your blood and lymph fluid (a watery fluid that carries the cells that fight infections and diseases to all parts of your body). An immunoglobulins test usually measures three main types of immunoglobulin (Ig) antibodies that do different jobs to protect your health: IgM antibodies are the first immunoglobulins your body makes after you're exposed to germs. They provide short-term protection while your body makes other antibodies.

Immunoglobulin D (IgD) appears to enhance mucosal homeostasis and immune surveillance by "arming" myeloid effector cells such as basophils and mast cells with IgD antibodies reactive against mucosal antigens, including commensal and pathogenic microbes. This test measures the level of Immunoglobulin D (IgD) in the blood. Immunoglobulin D is a type of antibody produced by the body's immune system. Normally, IgD levels are very low and not detectable by standard blood testing.

An allergy blood test measures a substance called immunoglobulin E (IgE) in your blood. IgE is an antibody that your body makes. If you have allergies, you may have more IgE in your blood than normal. Allergies are a common, long-term condition that involves your immune system. Test measures the level of IgE, a type of antibody. Antibodies (also called immunoglobulins) are proteins the immune system makes to recognize and get rid of germs. The blood usually has small amounts of IgE antibodies.