When performing a scratch test the medical assistant should?

When performing a scratch test, the medical assistant should first ensure the patient's skin is clean and dry. They should then use a sterile tool to make light scratches on the skin's surface, typically on the forearm, and apply allergens in a controlled manner. It's important to monitor the patient for any immediate reactions, such as redness or swelling, and document the results accurately. Finally, ensure the patient understands post-test care and follow-up instructions.