Dr.'s Order is a term used to describe the instructions given by a doctor to a patient or other medical personnel. The three letters MED, AMA, and MRI are all related to this term. MED stands for Medical Doctor, which is a professional who diagnoses and treats medical conditions. AMA stands for American Medical Association, which is an organization that sets standards for medical practice in the United States. MRI stands for Magnetic Resonance Imaging, which is a type of imaging test used to diagnose medical conditions. All three of these terms are related to Dr.'s Order, as they are all related to the medical profession and the instructions given by a doctor.