Final answer:
The medical assistant should utilize interpreter services or language translation tools to ensure effective communication with a patient who speaks a different language.
Step-by-step explanation:
When a medical assistant is checking in a patient who does not speak the same language, the most appropriate action to take is to utilize interpreter services or language translation tools. Ensuring effective communication is critical in healthcare settings to accurately assess the patient's needs and avoid potential misunderstandings. It's important to recognize that relying solely on written instructions may not be sufficient since literacy levels can vary.