Let your doctor know immediately if you develop a severe reaction at the site of injection, fever, or difficulty breathing. You will be asked to return to the test center in two or three days to be examined by a nurse or physician. Recent viral infection or vaccination, particularly against measles, or a weakened immune system may also produce a false-negative result. If you are allergic to the tested substance, redness and swelling will appear within 24 to 72 hours at the site of the injection. It's easy to perform.
Disadvantages Discomfort at the site of the test.
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