If you’re concerned you have a penicillin allergy, but want to know for sure before risking an allergic reaction, seek help from the North Texas Allergy & Asthma Associates team to learn more about skin testing. They can help patients identify their reaction using Pre-Pen skin tests in a safe way. Call or schedule an appointment online to visit any of their locations in North Texas: Texas Health Dallas, Baylor Regional Medical Center at Plano, and Baylor University Medical Center at Dallas.
While you can’t predict a penicillin allergy, a few factors increase the chance that you’re susceptible, including:
Penicillin refers to a group of antibiotics. If you’ve had an allergic reaction to one in the group, you may be allergic to the others. A few examples are:
Anyone who has a potential allergy to penicillin should have a skin test to verify the allergy prior to taking drugs in the penicillin family. The most common symptoms of penicillin allergy include hives, rash, and itching, so be sure to tell the doctors if you’ve experienced any of these symptoms after taking penicillin.
Even if you’ve been tested in the past, the doctors at North Texas Allergy & Asthma Associates may recommend having another skin test because many people lose the allergy over time. The bottom line is that it’s essential to know whether you can safely take penicillin, so if there’s any question, you’ll need a penicillin skin test.
A small amount of penicillin is dropped onto your arm, then the skin is pricked with a needle, but not deeply enough to draw blood. If you’re allergic, mast cells in the skin will recognize penicillin as an allergen and trigger an immune response — within 15-20 minutes a red, raised spot will appear where the skin was pricked. If the mast cells aren’t activated by the penicillin, you won’t get a reaction and the test is negative.
If the skin prick test is negative, it’s usually followed by a second skin test to verify the results. In the second test, a small amount of penicillin is injected into the skin, then the site is checked 15-20 minutes later to see if there was a reaction. If both tests are negative, you’re not allergic. If there’s any doubt about either one, further tests may be required.
If you have a positive test, you may still be treated with penicillin by going through a desensitization process. By receiving very small doses of penicillin every 15-20 minutes for about 4 hours, you’ll be desensitized enough to be treated with one normal course of penicillin. However, desensitization doesn’t last, and once you stop taking that course of penicillin, you’ll have the same allergic reaction if you ever take it again.
Pre-visit instructions 1 day prior and the morning of the procedure.
Stop all your anti-histamines 5-7 prior to your
•Books, activities, laptops, etc.
•Wear a half sleeve or sleeveless shirt
•Have a light breakfast the morning of the procedure
•Have a light snack before the procedure
•Make sure your asthma, if present, is under good control.
•Obtain baseline spirometry - FEV1 above 70%
•No B-blockers, ACEI, or evidence of cardiovascular disease
•Ensure we have Informed consent in chart
View list of insurances, Please call the office if you have any questions.
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