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Preparing for Allergy Skin Testing

Allergy skin testing is the gold standard for identifying exactly what is causing your symptoms. To ensure accurate results, please review the following instructions:

  • Avoid applying creams or lotions to your back or arms on the day of testing.
  • Wear a top that allows easy access to the upper back and upper arms.
  • Stop taking antihistamines 7 days before testing. Failure to do so may result in inaccurate results and require rescheduling of your testing appointment.
    • Benadryl may be used up to 3 days before testing.
  • Inform your provider about all medications you take, including antidepressants, sleep aids, stomach medications, herbal supplements, and beta-blockers, as some may interfere with test accuracy.
  • Asthma inhalers and anti-leukotrienes (e.g., Singulair®, Accolate®) do not need to be stopped.
  • If you are feeling ill (e.g., fever, cold, or severe allergy symptoms) on the day of testing, please contact our office to discuss rescheduling.

MEDICATIONS TO AVOID 7 DAYS BEFORE TESTING:

Over-the-counter Medications:

  • Allegra (Fexofenadine)
  • Zyrtec (Cetirizine)
  • Xyzal (Levocetirizine)
  • Claritin (Loratadine)
  • Alavert (Loratadine)
  • Sudafed Sinus/Allergy
  • Nyquil
  • Tylenol Cold
  • PM Medications (Tylenol PM, Sleep Aid)
  • Pepcid (Famotidine)
  • Tagamet (Cimetidine)

Prescription Medications:

  • Clarinex (Desoratidine)
  • Phenergan (Promethazine) 
  • Desyrel (Trazadone) will need to be stopped 7 days before testing

Several antidepressants and mood stabilizers can interfere with testing. Please inform providers if you are on any of these medications. 

Nasal Sprays:

  • Azelastine
  • Astelin
  • Astepro
  • Pantanase
  • Dymista
  • Ryaltris 

Download a printable PDF version of Diagnosing Allergies and What to Expect

Download PDF

If you have any questions about allergy testing or how to prepare, please call us at (210) 616-0882. We’re here to help make the process comfortable and informative.