Prick skin testing, also known as scratch testing, is one type of allergy test. A small disposable prick device applies the allergy extract to the skin by scratching or pricking the skin. A hive or raised bump may occur at the site of the prick test. Each test site will be measured and compared to a positive and negative control allowing for specific allergies of the patient to be identified. Prick testing may be applied to the forearms or the back depending upon the age of the patient, the number of tests ordered, and the condition of the skin. Results occur, typically between 10-20 minutes.
Intradermal skin testing is another type of allergy testing. A small intradermal injection applies the allergy extract underneath the skin. A hive or raised bump may occur at the site of the intradermal test. Each test site will be measured and compared to a positive and negative control allowing for specific allergies of the patient to be identified. Intradermal testing is typically applied to the outer arm. Results occur, typically between 10- 20 minutes, however, depending on the number of items being tested this test may take several hours to complete.
Subcutaneous injection may be required, depending on the test results. A subcutaneous injection is a method of administering medication. Subcutaneous means under the skin. In this type of injection, a short needle is used to inject a drug into the tissue layer between the skin and the muscle. Testing may also include giving the vaccine intramuscular and monitoring the patient for an hour after administration.
Your allergist may recommend vaccine testing if you develop a reaction after receiving a shot. Symptoms of a vaccine allergy may include swelling, itching, and redness. You may also experience coughing or breathing difficulties, and in severe cases, loss of consciousness or a drop in blood pressure.