A medical assistant who works PRN, which means “as-needed” is integral in all aspects of patient care. As a medical assistant, you monitor patients who receive treatment and record vital signs. You work in a clinical setting, such as a doctor’s office, hospital, or clinic. Your responsibilities include working under an RN or doctor, assisting with patients. Other duties involve recording data on patients, helping with patient comfort, and doing pre-appointment diagnostics for primary care physicians. At a hospital, you can work in various departments, prepping patients for procedures, cleaning up appointment rooms after visits, and handling patient files and test specimens. Since you work on an as-needed basis, you may only work for short periods when a facility is understaffed.