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Allergy Crystal Lake - Fan Choice Aword Dr. Hahn
Allergy Crystal Lake - Fan Choice Aword Dr. Askenazi

Patch Testing

Crystal Lake IL Patch - Patch TestAdvanced Allergy & Asthma Associates/Food Allergy Center of Illinois uses various techniques for diagnosing allergies. In many cases, a simple procedure called a prick test (or scratch test) can be performed and yield results the same day. However, in some cases a different kind of skin testing, known as patch testing, is needed. It takes a couple of days to provide results.

Patch testing is usually used to detect allergic reactions to substances such as poison ivy, household chemicals, metals, and their substances. It may also be used to diagnose food allergies. Using this technique, we can test for allergies to as many as 60 different substances at the same time.

The test is very simple and accurate. First, we will examine and clean the area to be tested, which is usually the upper back. Small samples of potential allergens are placed on your skin, and secured with a waterproof, medical-grade tape. The patches are well sealed, so they should not interfere with normal daily activities. However, it is important to follow any instructions that you are given by your doctor.

We will examine the tested skin and record data after you have worn the patches for 48 hours, and again after 72 hours. The information collected will help us determine if allergies to any of the tested substances are likely to be responsible for your symptoms.

Patch testing is painless, and causes minimal discomfort. However, you may experience itching under the patch. If you are allergic to any of the tested substances, you may develop redness, small welts, or occasionally small blisters. However, these are easily treated because a very small amount of the allergen is applied, and the area of contact is carefully confined by the small patch. A reaction to the patch test is a very good indication that we have identified the source of the problem, which is the most important step in solving it.

If you believe that you may be suffering from allergies, it is important to attain an accurate diagnosis, and seek appropriate treatment. You can count on the phenomenal team at Advanced Allergy & Asthma Associates/Food Allergy Center of Illinois to deliver state-of-the-art care, with compassion and respect. For your convenience, we have two beautiful offices located in Crystal Lake, and Elgin. Call us at (847) 888-8802 and schedule your appointment today.
Dr. Noga Askenazi, Advanced Allergy & Asthma Associates

Advanced Allergy & Asthma Associates

Dr. Noga Askenazi | Dr. Eugenia Hahn | Meredith Cirrincione

Dr. Noga Askenazi is a nationally recognized asthma and allergy specialist who is board certified in pediatric and adult allergy. Her areas of special interest are innovative treatment of rashes, sinusitis, food allergies, asthma and immune disorders. She was past President of the ISAAI (Illinois Society of Allergy, Asthma, & Immunology), works on state and national committees for advancement of the allergy field and is a consultant for Advocate, AMITA, Northwestern amongst other health care systems. Her joy is helping patients reach their goals after together determining best treatments. Her staff and patients are a chosen family, and she invests in their happiness. She enjoys gardening, biking and cooking to good music.


Dr. Eugenia Hahn is a highly recognized board certified allergist and immunologist who treats patients of all ages. Her areas of special interest are food allergy, eczema, and asthma. She is president of the Illinois Society of Allergy & Asthma, a National Committee leader of the American Academy of Allergy, Asthma, and Immunology, a member of the American College of Allergy, Asthma, and Immunology working on new treatment options for patients. She is a consultant for Advocate, Northwestern, AMITA, Northwest Community healthcare systems amongst many others. Her patients mean everything to her as she takes pride in finding the why behind the problem. She enjoys reading and spending time with her family.


Meredith Cirrincione is a board certified Physician Assistant and specializes in treating allergies, with a focus on asthma, rashes, environmental allergies, chemical and food allergies. She holds a Masters in Physician Assistant Studies from The Chicago Medical School - Rosalind Franklin University of Health Sciences. She is a Fellow member of the American Academy of Physician Assistants, the Illinois Academy of Physician Assistants, and the Association of PAs in Allergy, Asthma and Immunology. She likes to approach things holistically. She is a strong patient advocate and adored by her patients. She enjoys singing, reading, cooking, and the great outdoors.


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