Allergy blood tests is conducted to detect and measure the amount of allergen-specific antibodies in one’s blood. When you come into contact with an allergen (which triggers an allergy), your body makes antibodies against it. Allergy blood tests usually done for at least 10 of the most common allergens. They include dust, pet dander, trees, grasses, weeds, and molds related to the condition you live in. These tests specifically helpful in diagnosing food allergies.The test can also help in revealing what triggers the allergy symptoms in you.This helps your doctor choose the best treatment for you.