Tag Archives: IgG test

Should I do an elimination diet or do an allergy blood test?

Toronto Naturopathic Doctor

In dealing with inflammatory and irritable bowel diseases, elimination diets and IgG food testing are an important tool in crafting a treatment plan. In this post, Jonah Lusis, ND discusses what they are, and which is preferred.

I suspect my diet may be contributing to my digestive symptoms. Should I do an elimination diet or do an allergy blood test?

You can do either.

The strength of an elimnation diet is that it is a “bottom line” evaluation, asessing whether or not a food causes you to feel unwell regardless of whether the cause is immune-related, intolerance-related or sensitivity-related. It is ideal for conditions in which symptoms are the primary concern, such as irritable bowel syndrome.

Allergy blood testing is for an “IgG immune response” and will only identify foods causing an autoimmune response (i.e., “allergic”).

This approach is recommended for persons having autoimmune (i.e., inflammatory) conditions (e.g., inflammatory bowel diseases, multiple sclerosis, widespread rheumatoid arthritis) because it identifies foods that cause an immune system response, regardless of whether you are aware of symptoms in the digestive tract.

The bottom line:

  • Irritable bowel disease: elimination diet > IgG assessment (but IgG assessment can be helpful if an elimination diet is not possible)
  • Inflammatory condition: Do an IgG assessment

In our final post for Crohn’s and Colitis month, Jonah Lusis, ND will explain the difference between a food allergy test administered by an MD and an IgG test.

Let us know if we can help (with your digestive health or otherwise)!


Posted: 2014 November 20

What is the difference between the food allergy test I have had with my MD, and an IgG allergy test?

Toronto Naturopathic Doctor

In our last “Ask the Doctor” post for Crohn’s and Collitis Month, Jonah Lusis, ND answers a commonly asked question about IgE and IgG food testing.

What is the difference between the allergy test I have had with my MD, and an IgG allergy test?

The allergy test you have with your MD is usually a “skin-scratch” test. This test evaluated whether your body has an IgE (a type of immune system chemical) response to foods. The IgE response is the “immediate” response (e.g., hives, throat constriction) your immune system mounts to foods you are allergic to.

An IgG allergy assessment (such as this one) is a blood test that evaluates foods that trigger an IgG (a second, different immune system chemical) response by your body that also produces inflammation, but is typically delayed, and therefore more difficult to detect (e.g., migraine headaches, eczema).

Jonah Lusis, ND

We hope you enjoyed our digestive health series!

If you are struggling with digestive issues and are ready to get you tummy on track, we can help.


Posted: 2014 November 27