Services We Offer

Allergy Testing

Allergy Injections

Food Allergy Testing

Oral Immunotherapy (OIT)

Oral Food Challenges

Food Intolerance Testing

Pulmonary Function Testing

Chemical& Drug Patch Testing

Drug Allergy

Medicine Challenges

Penicillin Testing

Now Offering Food Intolerance Testing

Dr. Barnett is excited to offer a state of the art comprehensive food sensitivity test that combines IgE (allergic antibodies), IgG (food intolerance), IgG4( “blocking antibodies”) and C3d (inflammatory marker) for 88 food antigens.  The pattern of the positive tests for these 4 labs can help determine what foods may be causing symptoms and what foods should be avoided.   

An initial visit is required to discuss the test, obtain the test kit  and the  instructions for bringing the kit LabCorp to have the blood drawn.  A follow up visit is required to review your test results.

Frequently Asked Questions:

  • What foods are included in the test? 88 common foods: almond, apple, asparagus, aspergillus mix, avocado, banana, barley, beef, black pepper, blueberry, brewer’s yeast, broccoli, cabbage, cacao, candida, cantaloupe, carrot, casein, cashew, cauliflower, celery, cherry, chicken, cinnamon, clam, coconut, codfish, coffee, corn, cottonseed, cow’s milk, crab, cucumber, egg albumin, egg yolk, English walnut, flax seed, flounder, garlic, ginger, gluten, goat’s milk, grapefruit, grapes, green olive, green pea, green pepper, halibut, honeydew, hops, kidney bean, lemon, lettuce, lima bean, lobster, mushroom, mustard, navy bean,  oat, onion, orange, peach, peanut, pear, pecan, pineapple, plum, pork, rice, rye, salmon, scallops, sesame, shrimp, soybean, spinach strawberry, string bean, sweet potato, tea, tomato, tuna, turkey, vanilla, watermelon, white potato, whole wheat, yellow squash.

  • How much blood is needed?  2 tubes of blood are collected at LabCorp.

  • Do I need to be off any medications or fasting for the test?  You do not need to be fasting. You should be off are systemic steroids (Prednisone, Medrol, steroid shot) in the 5 days prior to having the blood drawn.

  • How long does it take to get results back?  Most results are back within 14 days, in rare cases if a patient has dozens of positive results the lab will repeat the test for quality control and it takes longer.

  • How do I get my results?  You will schedule a follow up visit at least 2 weeks from the time you get your blood drawn to discuss with Dr. Barnett.  We will not provide results on the patient portal, over the phone or via email.

  • Do I need an Epinephrine Autoinjector (Epipen/AuviQ) if I have positive Food Allergy testing?  No, unless you have a personal history of anaphylaxis to a food, an Epipen/AuviQ is not necessary. A positive food IgE test correlates with clinical reactivity to that food <50% of the time which is why food allergy testing in isolation is rarely helpful for patients with food intolerance symptoms. This test measures 4 different components for each food.

  • Is the test billable to insurance?  No but you can use HSA/HRA/FSA funds for the test. At the time of the visit with Dr. Barnett to discuss the test you will pay for the test and get your test kit to bring to LabCorp at that time. The test costs $425 and is due at the time the test kit is given.

  • Will LabCorp charge me anything? No, you will be given a sheet with Dunwoody lab’s LabCorp account which means there will not be a charge for the blood draw.

  • Can I go to Quest or CPL instead of LabCorp?  No, this has to be done at LabCorp.

  • Where is the closest LabCorp to the office?  571 W Main St, Lewisville, TX 75057

     Hours M-Th 8-5pm, you do not need an        appointment,  but you can make one at if you wish.

  • Are there certain days/times that the test can be drawn?  Because the specimen is sent by LabCorp via UPS to the lab that performs the test, it is preferable to go M-Th before 2pm.  The specimen can be held overnight in the fridge but not over a whole weekend so avoid Friday.

  • Do I have to be eating the foods that I’m being tested to for the test to be accurate? No, these immune markers are not affected by whether or not you’ve been eating the food. 

Healthy assortment of yellow foods