88 Food Antigen IgG with C3d/C3b - DBS

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Overview:

Various Antibodies and Their Meaning
 
IgG (immunoglobulin G, total) are antibodies that provide long-term resistance to infections and have a much longer half-life than an IgE allergy. This food sensitivity can be more subtle, and many people live with it for years, if not their entire lives. Sensitivity symptoms range from fatigue, headache/nausea, seizures, hyperactivity, bloating, mood changes, or dark circles under the eyes. IgG symptoms typically occur within 3-72 hours after the offending food was ingested and they will create ongoing inflammation that can make most conditions worse. Because they can present at such varied times, it is hard to isolate from a diet history alone, and testing becomes particularly useful.

The degree and severity of symptoms vary greatly from person to person because of genetic makeup. The complete elimination of IgG positive foods may bring about important improvements in symptoms of irritable bowel syndrome, autism, ADHD, cystic fibrosis, rheumatoid arthritis, and epilepsy, as demonstrated in numerous clinical studies. It is important to get tested for food sensitivities to know what foods work for the patient’s body and what foods don’t. If you are only looking at allergies, or IgE, then you would miss the IgG mediated symptoms, creating an incomplete patient picture.
 
C3 (complement component 3) is a protein of the innate immune system that is activated by microorganisms in the absence of an antibody. When C3d is activated in response to an antigen, the C3 portion attaches to the antigen. This activation, even though it is independent, will amplify the reaction that occurs with total IgG greatly increasing inflammation and symptoms of sensitivity. This same reaction that was designed to amplify inflammation to microorganisms, can be triggered in response to foods. If complement is present, it will amplify an IgG reaction as much as 1000 to 10,000-fold. Therefore, tests that only measure IgG may miss the reactions to foods that are most clinically relevant. C3 will be cleaved into multiple C3 breakdown products, and all of these play a role in increasing inflammatory response to foods.

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