Which of the following is NOT a duty of a medical assistant?

Medical assistants are trained to perform a variety of tasks that support healthcare providers and enhance patient care. Their roles typically include interviewing patients to gather medical histories, taking vital signs such as temperature, and assisting patients in preparing for examinations. These responsibilities ensure that the healthcare environment runs smoothly and that patients are properly cared for.

Administering local anesthesia, however, falls outside the scope of a medical assistant's duties. This procedure requires specific training and licensure, typically designated for registered nurses or licensed practical nurses, as well as supervision of a physician, depending on state laws and regulations. Therefore, the option that indicates the administration of local anesthesia accurately reflects a responsibility that is not within the typical purview of a medical assistant's role.