You can get a food allergy test at an allergist’s office, which is the most reliable and common option. Allergists perform skin prick tests and blood tests on-site, and they can interpret the results in the context of your symptoms. Other options include diagnostic labs like Labcorp, hospital allergy clinics, and some primary care offices, though each has different capabilities and limitations.
Allergist’s Office
A board-certified allergist is the gold standard for food allergy testing. These specialists can perform skin prick tests during your visit, order and interpret blood work, and conduct oral food challenges when needed. An oral food challenge, where you eat small amounts of a suspected allergen under medical supervision, is the most accurate tool for diagnosing a food allergy.
Two major professional organizations maintain free directories to help you find a specialist nearby. The American Academy of Allergy, Asthma & Immunology has a searchable tool at allergist.aaaai.org, and Food Allergy Research & Education (FARE) offers a similar directory designed specifically for people with food allergies. Both let you search by location.
Most insurance plans cover allergy testing when ordered by a provider, though some require a referral from your primary care doctor before you can see a specialist. Call your insurance company first to check whether you need that referral, or you may end up with an unexpected bill.
Diagnostic Labs
Commercial laboratories like Labcorp offer food allergy blood panels that measure IgE antibodies to common triggers like shellfish and nuts. Labcorp’s comprehensive food allergy test costs $359 out of pocket and can be purchased online without a provider visit. HSA and FSA funds are accepted. A healthcare provider reviews and approves your order remotely.
The trade-off is that a lab gives you numbers without much context. A positive IgE result shows sensitization, meaning your immune system recognizes that food, but it doesn’t necessarily mean you’ll have a clinical reaction when you eat it. You’ll likely still need an allergist to interpret the results and determine whether you actually have a food allergy.
Retail Clinics and Primary Care
Walk-in clinics like CVS MinuteClinic offer food sensitivity evaluations, but these are not the same as food allergy testing. A MinuteClinic provider will review your history, do a physical exam, and may test for lactose intolerance or gluten sensitivity. For actual food allergy diagnosis, they’ll refer you to a specialist or order blood work.
Your primary care doctor can also order IgE blood tests and refer you to an allergist. This is a reasonable first step if you’re unsure whether your symptoms point to an allergy, an intolerance, or something else entirely. Starting with your regular doctor also makes the insurance referral process smoother.
What Happens During Testing
The two main clinical tests are the skin prick test and the IgE blood test. During a skin prick test, a provider places tiny drops of food extracts on your forearm (or back, in children) and lightly scratches the skin beneath each drop. If you’re allergic, a small raised bump appears within 15 to 20 minutes. The whole process takes about 20 to 40 minutes and can check for reactions to up to 50 substances at once.
Skin prick tests are reliable for airborne allergens like pollen and pet dander, but food allergies can be more complex. A positive skin test alone doesn’t confirm a food allergy. Your allergist may follow up with blood work measuring IgE levels, an elimination diet, or an oral food challenge to get a definitive answer.
Blood tests are simpler from the patient’s perspective: a standard blood draw, results in a few days. But like skin tests, they show sensitization rather than confirmed allergy. Both tests work best when interpreted by a specialist who can weigh the results against your actual symptoms and diet history.
How to Prepare for a Skin Prick Test
If you’re scheduled for a skin prick test, you’ll need to stop taking antihistamines at least seven days beforehand. This includes common over-the-counter options like diphenhydramine, cetirizine, loratadine, and fexofenadine. Cold and sinus medications and sleep aids that contain antihistamines also need to be paused for a full week.
Acid-reducing medications like famotidine contain a form of antihistamine and should be stopped one day before testing. Nasal antihistamine sprays need a full week off as well. If you take a tricyclic antidepressant, talk to your prescribing doctor before stopping it, but these also need to be paused a week ahead. Taking any of these medications can suppress your skin’s reaction and produce falsely negative results, or in some cases make testing unsafe.
Skip At-Home IgG Kits
At-home food sensitivity tests sold online typically measure IgG antibodies rather than IgE antibodies. This is a critical distinction. IgG antibodies don’t indicate an allergy or intolerance. They actually reflect normal immune exposure to foods you eat regularly. A high IgG level to a food often means you’ve built tolerance to it, not that it’s harming you.
The Cleveland Clinic, the American Academy of Allergy, Asthma & Immunology, and the Association for Diagnostics & Laboratory Medicine all recommend against using these tests. No clinical trials have shown that IgG-based panels accurately identify food sensitivities or intolerances. The likely result is a long list of false positives that leads to unnecessary dietary restrictions without solving your actual problem.
Testing for Infants and Young Children
Food allergy testing in babies requires special consideration. The immune system changes rapidly during the first year of life, and standard reference values for skin prick tests and blood IgE levels haven’t been well standardized for infants. A positive test in a baby shows sensitization but is particularly poor at predicting whether that child will actually react to the food.
Oral food challenges are the most accurate diagnostic tool for infants, but they present unique challenges. Babies can’t describe symptoms like throat tingling or stomach pain, so providers need to watch for subtle behavioral changes. Feeding difficulties, satiety, and even nap schedules can complicate the process. These challenges typically take four to six hours and should be scheduled when the baby is normally awake and feeling well.
Pediatric allergists are best equipped for this work. Some infants with severe eczema may need blood testing instead of skin testing because widespread skin inflammation can make skin prick results unreliable. If your pediatrician suspects a food allergy in your baby, ask for a referral to a pediatric allergist rather than relying on broad screening panels. Indiscriminate testing in infants often leads to false positives and unnecessary food avoidance during a critical window for building tolerance.