The allergy testing you get at your family doctor's or with an allergist tests your IgE reactions — the "true" allergy responses like anaphylaxis to peanuts or hives from pet dander. These are immediate reactions. But there's another part of your immune system that can react to foods without you even realizing it — and it can take days for the symptoms to appear.
IgG vs IgE: What's the Difference?
IgE reactions (Type 1 Hypersensitivity) are immediate — hives, shortness of breath, flushing, swelling. These are the reactions your allergist tests for. But your immune system can also mount an IgG reaction (Delayed Sensitivity Reaction), which is a different pathway entirely. After you eat something your body flags as an antigen, it develops antibodies that "tag" the food for your immune system to attack. This process can take several days.
Because the reaction is delayed, you may not connect what you ate on Monday to the bloating, headache, skin flare-up, or fatigue you feel on Wednesday or Thursday. Common IgG reactions include gas and bloating, skin conditions (eczema, psoriasis), fatigue, weight gain, brain fog, and headaches. Testing your IgG food sensitivities gives you clear guidance on what foods may be causing your symptoms, so you can adjust your diet and feel better.
- Food sensitivities
- IBS & digestive issues
- Skin conditions
- Chronic fatigue
- Weight management
- Headaches
- Hormone imbalance
- Thyroid concerns
- Nutrient deficiencies
- Celiac screening
Testing at TruChange
Whether you want help interpreting past test results, or need new requisitions, we work with you to identify the right tests for your situation. Dr. Irene takes the time to explain what each result means and how it connects to your symptoms — something many patients don't get enough of from standard blood work reviews.
- IgG Food Sensitivity Panel — identifies delayed food reactions that may be causing inflammation, digestive issues, skin problems, or fatigue.
- Hormone Testing — saliva, urine, and blood panels for cortisol patterns, thyroid function (TSH, T3, T4), and sex hormones.
- Celiac Profile — gliadin and tissue transglutaminase antibody testing.
- Gut Bacteria & Flora Testing — comprehensive stool analysis evaluating digestion, inflammation, and gut ecology.
- Fatty Acid Profile — measures omega-3, omega-6, trans fats, and saturated fats to assess inflammation and heart disease risk.
- Vitamin & Mineral Panels — including vitamin D, B12, iron, and more.
Testing takes the guesswork out of treatment. Instead of trying everything and hoping something works, we can target our approach based on what your body is actually telling us.
If you've been dealing with symptoms that no one can explain, or you've had blood work done but never really understood the results, we can help. We requisition, interpret, and act on lab results — connecting the dots between your test numbers and how you actually feel.