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Private MD Lab Services offers the following test to aid in the diagnosis of food allergies:
|Allergen Profile, Basic Food Profile $92.99|
|View included tests|
Food allergy testing is a way to check your body's reaction to certain foods. One or more of the following tests may be done:
If you have a history of allergic symptoms after eating certain foods, your health care provider may recommend that you have tests to check for food allergies. This will help you know which foods you should avoid eating to prevent an allergic reaction.
You may need to be tested for food allergies if you have some of the following symptoms shortly after eating:
One or more of the following tests may be done.
Skin prick test: A skin prick test is often used to test for food allergies. For this test, a drop of food extract is put on the skin and then the skin is pricked with a small needle through the drop of the food extract. The test can also be done with a pricking device that has been presoaked in the food extract. Only the top layer of skin is pricked. The test is usually done on the back or the arm. The skin test is ready to check in about 15 minutes. If you are allergic to the food in the extract, a red bump that looks like a mosquito bite will appear at the spot where the food extract was placed.
Blood test (RAST test): Blood tests are not done as often as skin prick tests, but they can be useful in certain cases. The test measures the amount of IgE antibody in your blood. The body makes this type of antibody when trying to fight off the allergy-causing substances in food (allergens). A sample of your blood is sent to a lab where tests are done with specific foods to determine if you have IgE antibodies to those foods. The test results show whether you are making antibodies to these foods and thus whether you are allergic to these foods.
Food challenge: Your health care provider may want you to do a food challenge test. For this test, you are given gradually increasing amounts of a food while your provider watches for symptoms. This test should be done only by a trained professional who is ready to treat you if you have a serious reaction to the food. In cases of allergies that are not caused by IgE antibodies (such as some gastrointestinal allergies), a food challenge test may be the only good way to diagnose a food allergy.
Elimination diet: Your health care provider may want you to stop eating suspect foods for a week or two and then add the foods back into the diet one at a time. This process can help connect symptoms to specific foods. During this time, you will need to keep a record of the foods you eat and any symptoms you have. If you have had a severe reaction to foods, this method cannot be used.
Ask your health care provider how you will get the result of your skin prick or blood test.
If the skin or blood test is negative for a food, then you probably do not have an allergy to that food.
If the skin test is positive for a certain food, it may mean you are allergic to that food.
Sometimes the test can be positive even if you are not allergic to the food. The positive test result can be wrong sometimes because:
Test results are only one part of a larger picture that takes into account your medical history and current health. Sometimes a test needs to be repeated to check the first result. Talk to your health care provider about your result and ask questions.
For more information contact:
Food Allergy and Anaphylaxis Network (FAAN)
Phone: (800) 929-4040
Web site: http://www.foodallergy.org.
Material used with permission from the Food Allergy and Anaphylaxis Network.
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