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Hypersensitivity reactions have been categorized in various ways, although even this does not always help us when it comes to determining the most appropriate tests that should be done. Nor does this change that fact that you need to avoid the culprit food(s) and address other aspects of your health as necessary. Categorizing reactions is of much more use to scientists and practitioners involved in the field. However, showing you the different categories will help you to understand why symptoms such as yours may have been misunderstood or misdiagnosed in the past. It will also help you to understand why some tests can be wholly inappropriate for you and your symptoms.

These are the classifications for hypersensitivity reactions:

Type I – Immediate IgE reactions

Type II – Cytotoxic antibody-mediated reactions

Type III – Delayed-onset, mainly IgG-mediated reactions

Type IV – Cell-mediated and T Cell-mediated reactions which may also involve IgG reactions

Now let’s take a look at each one in more detail.