A PA is a licensed medical professional who can examine patients, diagnose illnesses, prescribe medications, and develop treatment plans. PAs hold advanced degrees, work across nearly every medical specialty, and provide much of the same direct patient care that physicians do. The profession is currently in the middle of a name transition: PA has traditionally stood for “physician assistant,” but the American Academy of PAs voted in 2021 to adopt “physician associate” as the official title. Three states (Oregon, Maine, and New Hampshire) have passed legislation making the new title official, while most states still use the original term. The national certifying body treats both names as interchangeable.
What a PA Does Day to Day
PAs function as frontline clinicians. On a typical day, a PA might conduct physical exams, diagnose injuries or illnesses, order and interpret blood tests or imaging, stitch wounds, set broken bones, assist in surgery, and counsel patients on managing chronic conditions like asthma. They also prescribe medications, manage treatment plans over time, and advise on preventive care.
The scope of a PA’s work looks different depending on the setting. PAs in family medicine handle a broad mix of everyday health concerns. Those in emergency departments triage and treat urgent cases. Surgical PAs assist in the operating room and manage post-operative recovery. Compared to nurse practitioners, PAs are more likely to work in urgent care, emergency medicine, and surgical subspecialties, though both professions overlap heavily in primary care.
How PAs Are Trained
Becoming a PA requires a bachelor’s degree followed by a graduate-level PA program, which typically runs about three years. PA curricula are modeled on medical school curricula, covering anatomy, physiology, pharmacology, and clinical medicine. The final year is almost entirely hands-on: students rotate through specialties like internal medicine, surgery, pediatrics, and psychiatry, spending roughly one month in each.
Admission to PA school is competitive. Programs generally require a minimum GPA of 3.0, with strong grades in prerequisite sciences including chemistry, organic chemistry, biology, anatomy, physiology, microbiology, and genetics. Most applicants also bring several hundred hours of direct patient care experience, such as working as an EMT, medical assistant, or paramedic. Programs recommend at least 400 hours of hands-on clinical exposure and a minimum of 40 hours shadowing a practicing PA.
After completing their program, graduates must pass the Physician Assistant National Certifying Examination (PANCE) before they can practice. This is a standardized, multiple-choice exam covering the full breadth of medical knowledge a generalist PA needs.
Prescribing Authority
PAs can prescribe medications in all 50 states, but the specifics vary by state, particularly for controlled substances. Most states allow PAs to prescribe everything from antibiotics to Schedule II drugs (the category that includes opioids and stimulants like Adderall), though often with limits. In Arizona, Illinois, Montana, North Carolina, Pennsylvania, and South Dakota, for example, PAs can prescribe Schedule II medications but only up to a 30-day supply. Georgia and Texas prohibit PAs from prescribing Schedule II drugs entirely, though they can prescribe less tightly controlled medications in Schedules III through V.
Some states also require PAs to complete board-approved courses on controlled substances before gaining prescriptive authority. In practice, these rules mean that your experience filling a prescription from a PA will depend partly on where you live.
How PAs Differ From Nurse Practitioners
PAs and nurse practitioners (NPs) fill similar roles in many clinics and hospitals, and from a patient’s perspective the visit may feel identical. The core difference is in training philosophy. PAs are trained as medical generalists using a curriculum based on the physician training model. NPs are trained in advanced nursing practice, building on a nursing foundation. This means PAs enter practice prepared to work across specialties without additional certification, while NPs typically specialize during their training (for instance, in family practice, pediatrics, or psychiatry).
Both can diagnose, treat, and prescribe. The level of physician oversight required varies by state for each profession, and both are moving toward greater independence through legislative changes.
Supervision and Growing Autonomy
PAs have historically practiced under a formal supervisory or collaborative agreement with a physician. In practical terms, this doesn’t mean a doctor watches over every patient encounter. It usually means a physician reviews a portion of the PA’s charts, is available for consultation, and co-signs certain orders. The supervising physician may be in the same building, across town, or connected by phone depending on the state and setting.
The profession is actively pushing to modernize this model through what it calls Optimal Team Practice. The goal is to eliminate the legal requirement for a specific supervisory relationship with a named physician, instead allowing PAs to practice as part of a healthcare team without that formal link. This would also establish PA-majority licensing boards and allow PAs to bill insurance directly. Several states have moved in this direction, though the pace of change varies widely.
Where PAs Work
PAs practice in virtually every corner of medicine. You’ll find them in family practice offices, hospital emergency departments, orthopedic clinics, dermatology practices, cardiology groups, and operating rooms. Because their training is generalist by design, PAs can switch specialties during their career without going back to school, something physicians cannot easily do. A PA who spent five years in orthopedics can transition to urgent care or dermatology with on-the-job training.
This flexibility is one reason the profession has grown rapidly. The U.S. Bureau of Labor Statistics classifies PA as one of the faster-growing healthcare occupations, driven by an aging population, physician shortages, and the expansion of team-based care models in both urban hospitals and rural clinics where recruiting physicians is difficult.