Allergies are an overreaction of your immune system to a specific item (allergen). Allergic reactions can range from mildly annoying like sneezing and itching to potentially life-threatening problems.
Allergy tests are a group of tests. They are used to identify the allergens that are causing your allergic reactions. This information can be used to help you make an allergy management plan.
Allergy tests can cause itchiness locally. It is rare, but some may have a severe allergic reaction to allergens used in testing. Your condition will be monitored after the test to manage any negative reactions.
Keep a diary of your allergy symptoms. When you have symptoms, write them down, including:
For certain tests, you may be asked to stop certain medications before the test.
There are several types of allergy tests:
An antihistamine may be advised after the test. This can reduce itchiness at the test site. For severe allergies, make sure you have your EpiPen available if you use one.
You may have mild irritation where the substance is applied to the skin. The needle pricks are small but can be irritating.
Skin and patch test results are available right away. Blood test results may take more time.
Avoiding your specific allergens will help lessen your symptoms. You and your doctor can also discuss additional steps to help control your allergic reactions.
Many factors can affect the reliability of lab tests. A test may suggest an illness that actually does not exist. This is called a false positive. A test may also miss an illness that actually does exist. This is called a false negative.
A doctor will consider the results from many tests and your symptoms before making a diagnosis. It is important to discuss these results with your doctor before making any conclusions.
American Academy of Allergy, Asthma & Immunology
National Institute of Allergy and Infectious Diseases
Allergy Asthma Information Association
Canadian Allergy, Asthma, and Immunology Foundation
Allergic rhinitis. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T116217/Allergic-rhinitis. Updated September 19, 2016. Accessed October 7, 2016.
Allergy testing: tips to remember. American Academy of Allergy, Asthma, and Immunology website. Available at: http://www.aaaai.org/conditions-and-treatments/library/at-a-glance/allergy-testing.aspx. Accessed September 23, 2015.
Bernstein IL, Li JT, et al. Allergy diagnostic testing: an updated practice parameter. An Allergy Asthma Immunol. 2008 Mar;100(3 Suppl 3):S1-148. Available at: http://www.aaaai.org/Aaaai/media/MediaLibrary/PDF%20Documents/Practice%20and%20Parameters/allergydiagnostictesting.pdf. Accessed September 23, 2015.
Last reviewed September 2016 by Marcin Chwistek, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.