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Immunoglobulin G (IgG) - description and reference ranges

What is it?

Immunoglobulin G (IgG) is an antibody blood protein. Representing approximately 75% of serum antibodies in humans, IgG is the most common type of antibody found in blood. Your body produces IgG, as well as other types of antibodies to help fight illness.

Reference ranges

If your indicative IgG level is lower than the reference range for our laboratory:

An IgG deficiency is a health condition where your body does not make enough Immunoglobulin G (IgG). People with IgG deficiency are more likely to get infections.

You can discuss this result with your GP if you are concerned.

If your indicative IgG level is higher than the reference range for our laboratory:

High levels of IgG generally implies that you have an infection or an inflammatory or autoimmune disease. This also generally involves your central nervous system. In cases of an autoimmune disorder, this causes your immune system to attack your own healthy cells by mistake. This can lead to various problems with health.

You can discuss this result with your GP if you are concerned.

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