Clinical Tests for Allergy Skin Tests Immediate Response (wheal flare reaction;20 min) increased vascular permeability local edema itching Late Reactions (5-24 hr) RAST (Radio Allergo Sorbant Test) Clinical Tests for Allergy ◼ Skin Tests ◼ Immediate Response (wheal & flare reaction; 20 min) ◼ increased vascular permeability ◼ local edema ◼ itching ◼ Late Reactions (5-24 hr) ◼ RAST (Radio Allergo Sorbant Test)