1. Preparation: The patient's back is cleaned and marked with a grid to ensure accurate placement of allergens. 2. Application: Small amounts of potential allergens are applied to the skin using adhesive patches. 3. Monitoring: The patches remain on the skin for 48 hours, during which patients should avoid activities that may dislodge them. 4. Evaluation: After 48 hours, the patches are removed, and an initial reading is taken. A final reading is usually done after 72-96 hours to observe delayed reactions.
