A small amount of a dilute extract of the food to be tested is injected into the skin of the patient's arm or given under the tongue. Any symptoms that result are recorded and the skin reaction is monitored. Then injections or sublingual drops of weaker or stronger dilutions of the same food extract are given. 4 Blood tests are the easiest tests for the patient to take. Hundreds of foods can be tested using one blood sample.
Blood tests can detect delayed as well as immediate food allergies.
Food allergies that show up as positive on a blood test should be confirmed by an elimination and challenge test. 7 Treatments Special diets are the most commonly used treatment for food allergies. If the patient is allergic to only one or two foods, eliminating the offending foods may be the only treatment necessary. This is the course usually taken in the case of children with peanut anaphylaxis. My father was able to treat the milk allergy he got from drinking large quantities of milk for an ulcer by simply eliminating dairy products.