We had Hen's intermittent cough checked out by his doc a few weeks ago and just today had our appointment with an allergist to see if Hen is allergic to anything in the home/environment that could be causing it. The nurse administered the pediatric test since Hen's only symptom is the cough - no watery and irritated eyes, no runny nose, no rashes. This test includes stuff in the home like mold and dust mites and, because we have cats, cat dander, and stuff outside the home like grasses, pollen, etc. These allergens are applied to the skin and monitored for twenty minutes. The test concludes after the skin around the allergen is examined and measured to see if a reaction has occurred, which would indicate an allergy to the specific allergen. This is what it looks like:
Hen did just fine and has no apparent allergies.