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Types of Allergy Testing

Blood Test
Blood Test

Allergy skin testing is the preferred method, but in some cases blood testing may be ordered. Allergy blood testing is recommended if you: Are using a medicine known to interfere with test results and cannot stop taking it for a few daysl this would include antihistamines, steroids, and certain antidepressants.

source: webmd.com
image: medifee.com
Challenge Test
Challenge Test

In this case, he or she may recommend an oral food challenge (OFC). This is a highly accurate diagnostic test for food allergies. Safety of Oral Food Challenges. Because this test can cause a serious allergic reaction, only an experienced allergist should conduct it. It should happen at a medical facility with the appropriate medications and equipment.

Skin Tests
Skin Tests

Skin testing one way your doctor can check on what causes your symptoms. These tests use extracts (a concentrated liquid form) of common allergens such as pollen, mold, dust mites, animal dander, and foods.

source: webmd.com