1. Preparation: The patient is usually advised to avoid antihistamines and certain medications for a period before the test to avoid false-negative results. 2. Procedure: The nurse will clean the skin, usually on the forearm or back, with alcohol. Small drops of potential allergens are then placed on the skin. A sterile lancet is used to lightly prick the skin through each drop. 3. Observation: The nurse will observe the skin for about 15-20 minutes to identify any reactions. A positive reaction is usually a red, raised bump that may be itchy.
