Certified medical assistants support physicians and other clinical staff by performing a variety of clinical and administrative tasks. They perform many of the same duties as non-certified medical assistants, but their certification shows a level of mastery for the job. As a certified medical assistant, you may prepare exam rooms, collect lab specimens, interview patients, provide medication, administer vaccinations, arrange referrals and hospital stays, make and receive phone calls, stock medical supplies, assist the doctor in exams and more. Every day is different, which is one thing many certified medical assistants like about the job. You find certified medical assistants in private doctor's offices, hospitals, clinics, and other healthcare facilities.