What do I need to do before my allergy test?
Antihistamine medications must be stopped before skin prick testing and performing a food challenge. However antihistamines do not need to be stopped before blood testing. Short-acting antihistamines such as Piriton [Chlorpheniramine], Ucerax [Hydroxizine], Benadryl [Acrivastine] should be stopped 48 hours before skin testing.
How long does allergy testing take?
If you’re having an allergy skin test, plan to spend about an hour for the entire appointment. For the scratch and intradermal skin tests, the allergen placement part of the test takes about 5 to 10 minutes.