Food Allergy Testing

IgG Food Allergy Testing

There are 2 types of food allergies.

The first type is the one most of us are most familiar with and is responsible for allergies to foods such as peanuts and shellfish. This type of allergy is an immediate onset allergy and symptoms are usually seen immediately after ingesting or even inhaling an allergenic food. Symptoms may include hives, itchiness, mucous production or even a life threatening constriction of the airway. This is known as a Type 1 hypersensitivity reaction and is mediated by an antibody called Immunoglobulin E (IgE). Testing for this type of food allergy is usually done through your family doctor or allergy specialist with a scratch test or by testing serum IgE.

The second type of food allergies are called Type 3 delayed hypersensitivity reactions and are mediated by Immunoglobulin G (IgG).  With IgG reactions, symptoms often do not become apparent for hours or even days after ingesting an offending food. For this reason, these types of allergies are often difficult to put your finger on without specific testing.

When IgG binds with a large amount of antigen (in this case, food) these complexes can be deposited in a number of tissues resulting in a wide variety of symptoms including:

  • Headaches
  • Asthma
  • Recurring upper respiratory infections
  • Skin conditions such as acne, eczema or psoriasis
  • Joint pain
  • Digestive issues, especially IBS

IgG food testing is done through Rocky Mountain Analytical. The test may be done in office or even at home and involves only a simple finger prick, like when testing blood sugars at home. Results are usually back in approximately 3 weeks and show levels of IgG to 96 of the most common offending foods. Custom allergy reports are also available.