Do you also experience itching , redness, and difficulty breathing when you eat certain foods? Or do you feel strange or uncomfortable when you give your baby certain foods? Are you confused about whether this is really an allergy or something else? At such times, the best and most reliable way to completely eliminate that doubt is the Food Challenge Test that we are going to talk about.
Simply put, what is this Food Challenge Test?
A food challenge test is a medical test that is performed to determine whether a person is truly allergic to a particular food. Sometimes, this test is also performed to see if an allergy that was present in childhood has now disappeared.
This involves gradually introducing the food you suspect you are allergic to, under the direct supervision of a doctor or allergist .
Most importantly: Do not attempt this test at home for any reason . Because severe allergic reactions can sometimes occur, it should only be done in a medical facility. This is why this test is considered the "Gold Standard" for diagnosing food allergies .
How do you do this test?
The steps to perform this test are very simple. Imagine you suspect you have a peanut allergy. Here's what happens:
- Step 1: Your doctor will give you a very small amount of peanuts to eat. It may be a peanut kernel. Sometimes this is put in a capsule that you can swallow like a pill.
- Observation: The doctor will then carefully observe you for about 15 minutes, looking for signs of an allergy (e.g., itching , hives , difficulty breathing ).
- Next dose: If there are no allergic symptoms, the doctor will let you eat a little more peanuts.
- Repeat: Gradually increase the dose until an allergic reaction occurs, or until you have eaten the entire amount of peanuts that a person would normally eat at one time (broken into 4-6 doses).
- End of the test: If you develop any allergic symptoms at any time,The test will be stopped immediately . At that point, the doctor will confirm that you have an allergy and give you the necessary medication to control your symptoms.
- If you have no allergies: If you eat the entire dose and don't experience any allergic symptoms, it means you are not allergic to that food.
Usually, only one type of food is examined in one test.
When is a Food Challenge Test needed?
Usually, the first step in diagnosing food allergies is a skin prick test or a blood test. However, sometimes the results of these tests are inconclusive. In cases where it is suspected that an allergy may or may not exist, a Food Challenge Test is performed to confirm it 100% .
This test is often done for a type of allergy called `IgE-mediated`. Simply put, this is a type of allergy that is caused by the `IgE` antibody in our body and causes symptoms immediately after eating a food.
What are the methods for doing this test?
There are three main ways to perform this test. All of these methods take place under medical supervision in a hospital or clinic.
| Test method | Simply description |
|---|---|
| Double-blind, placebo-controlled | In this case , you don't know whether the food (or capsule) you are given contains the allergen or not, and neither does your doctor. One contains the allergen, and the other contains a placebo. This is the most accurate method. However, this method is usually used for research purposes rather than in clinical trials. |
| Single-blind | In this method, the doctor knows what type of food is allergenic and what is not, but you don't. |
| Open-food Challenge | This is the most commonly used method. In this , you know what type of food you suspect you are allergic to, and the doctor knows it too. The test is done openly without hiding anything. |
How should you prepare before the test?
Your doctor will give you a set of instructions before the test. These are essential to getting accurate results.
- You may be asked to stop eating all foods you know you are allergic to about two weeks before the test.
- You will be asked to stop taking any allergy medications (antihistamines) a few days before the test.
- You may be asked not to eat or drink anything for a few hours on the morning of the test.
- Important: If you are using essential medications such as an inhaler for a condition like asthma , be sure to talk to your doctor about it. Use the medication as directed.
- If you have a cold or fever on the morning of the test, inform the doctor and postpone the test.
What happens during and after the test?
It's normal to feel a little nervous before a test like this. But remember, you're in a completely safe environment. The medical team is monitoring everything (your breathing, your heart rate).
The test may take 3-4 hours or more. If you develop any allergic symptoms, you will be monitored for several hours to control them. Even if no symptoms develop, you may be monitored for another two hours after the full dose has been taken.
Results after the test
The results can be seen immediately.
- If the result is "Tolerated": This means you did not develop any allergic symptoms. You can eat that food without fear.
- If the result is "Reacted": This means you have developed allergic symptoms. Your doctor will advise you on how to avoid that food. They may also prescribe medication, such as an `Epinephrine` auto-injector (e.g. `EpiPen®`), for use in an emergency.
Is this really safe? Is there a risk?
Yes, there is some risk. That is why this test is performed under the supervision of a doctor.
Most people only experience minor allergic symptoms, such as hives and itching. These can be quickly treated with medication.
Severe, life-threatening allergic reactions such as difficulty breathing or `Anaphylaxis` are very rare. But if they do happen, you have all the medical equipment, medications, and a trained medical team nearby to deal with them. So there is nothing to fear.
The so-called "food sensitivity test" kits available online or in pharmacies are not the same as this food challenge test. The results they provide are not medically accepted. Therefore, if in doubt, always consult your doctor.
Take-Home Message
- The best and most reliable way to know for sure whether you have a food allergy or not is the Food Challenge Test.
- Never do this test at home. Always do it in a hospital or clinic, under the supervision of a doctor.
- It's normal to feel a little nervous before the test, but remember that you're in a safe environment with a medical team ready to handle any emergency.
- The test results will give you a clear answer, allowing you to adjust your diet without fear or correctly avoid allergenic foods.
- Do not trust unapproved test kits available online, and consult your doctor for proper advice if you suspect any allergies.
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