Question

How long does it take to know the allegy test?

Answer 1

How long does it take to get skin test results?
Skin testing is fast. For both types of skin tests, positive reactions usually appear within 20 minutes. Sometimes redness and swelling can occur several hours after skin testing. The delayed reaction usually disappears in 24 to 48 hours, but should be reported to the allergy doctor or nurse.

http://acaai.org/allergies/treatment/allergy-testing