Allergy Testing: How to Prepare and What to Expect

Allergy testing can be your first step toward managing your allergies. If you’re getting ready for an allergy test, you may wonder if there’s anything you should do to prepare and what to expect with the testing. Here’s what you need to know.

Allergic reactions can cause a range of symptoms from itchy rashes to runny noses to more serious anaphylactic reactions.

While there are many things you can do to manage your allergies, including avoiding what triggers them and taking medication, you need to first know what allergies you have before you can start to manage them successfully.

That’s where allergy testing comes into the picture. Allergy testing can rule out or confirm your allergies. Dr. Asif Aziz and Guiselle Berry, FNP, then use your test results to shape your treatment plan.

If you’re scheduled for allergy testing at Elite Primary Care, PA, in Greenville, Texas, here’s what you need to know.

Different types of allergy testing

The first step to getting ready for your allergy test is knowing which type of testing you need. There are several types of allergy testing.

Skin prick test

The prick test, also known as a skin prick or scratch test, is a type of allergy test that checks for multiple allergic responses at once.

During a skin prick test, your provider uses a pen to mark testing areas on your back or forearm. Next, they place a drop of potential allergens (such as pollen, pet dander, and mold) onto the treatment area.

Then they lightly scratch or prick the area so the allergen penetrates your skin. If your skin turns red, swells, or itches at any of those sites, this confirms what substances you’re allergic to.

To prepare for this type of test, you may need to stop taking any medications that would interfere with a positive result. This includes antihistamines (both over-the-counter and prescription), tricyclic antidepressants, and certain heartburn medications.

You can expect to feel the itchiness at the control test site (histamine) as well as any other positive allergic reactions.

Patch testing

Patch testing also helps confirm the source of your allergies. With patch testing, the allergen is applied onto a patch, which you wear for up to 48 hours. After removing the patch, if your skin is red and itchy, you can consider yourself allergic to that substance.

To prepare for this type of testing, avoid putting anything on your skin for 48 hours before applying the patch. This includes lotion, perfumes, and topical anti-itch creams. Plan to avoid sun exposure, and make sure your clothing covers the patch or you stay in the shade. Avoid the use of hydrocortisone cream, as that can make your results inaccurate.

Blood test

A blood test for allergy testing involves analyzing a small sample of your blood. It measures the presence and levels of specific antibodies, known as immunoglobulin E (IgE), that your immune system produces in response to potential allergens.

This diagnostic method works by identifying and quantifying IgE antibodies associated with specific allergens — without direct exposure to potential triggers.

This test does require a blood draw, so you can expect a quick pinch and then it’s done. The rest of the analysis takes place in the lab, so you don’t have to worry about itching with this test.

To prepare for a blood allergy test, you may need to temporarily discontinue certain antihistamines beforehand to ensure accurate results. Don’t adjust your medication unless our team directs you to do so.

Challenge testing

The challenge test, also known as an oral food challenge or drug challenge, is performed under the supervision of Dr. Aziz. This method is used when there is uncertainty or ambiguity regarding a specific allergen.

During a challenge test, you ingest or we apply a small amount of the suspected allergen under controlled conditions. It’s mostly done for suspected food or medication allergies. Dr. Aziz closely monitors you for any adverse reactions.

Challenge tests are crucial for confirming or ruling out allergies, especially when other test results, such as skin pricks or patch tests, are inconclusive. As with the other allergy tests, Dr. Aziz will provide specific preparation instructions, which may include avoiding certain medications prior to your test.

Do you have questions about your allergy testing? We’re happy to explain the details and set your mind at ease. Give us a call at 903-437-9212 or book an allergy testing consultation online to get started.