What Does a Physician Assistant (PA) Actually Do?

If you’ve ever left a doctor’s office and realized the person who examined you, diagnosed your condition, and wrote your prescription wasn’t actually a physician, you’ve likely been treated by a physician assistant. It’s one of the fastest-growing, most in-demand careers in healthcare, and one of the most misunderstood.

Here’s a clear look at what a PA actually does, how the career path works, and what it takes to become one.

What Is a Physician Assistant?

A physician assistant (PA) is a licensed medical professional who examines, diagnoses, and treats patients under the supervision of a physician. PAs aren’t medical assistants, and they aren’t nurses, they’re trained to practice medicine, often with a level of autonomy that surprises people who’ve never worked with one.

Depending on the state and practice setting, a PA may:

• Take patient histories and perform physical exams
• Order and interpret diagnostic tests, like labs and imaging
• Diagnose illnesses and injuries
• Develop and manage treatment plans
• Prescribe medication
• Assist in surgery
• Counsel patients on preventive care and health management

In many rural and underserved communities, a PA may be the primary healthcare provider patients see on a regular basis, especially in clinics where a physician is only on-site a few days a week.

How Is a PA Different From a Doctor, Nurse, or Medical Assistant?

This is one of the most common points of confusion, so it’s worth breaking down directly:

• PA vs. Physician (MD/DO): PAs practice medicine under a supervising physician’s oversight; they don’t attend medical school or complete a residency. PA training is shorter (typically 2–3 years of graduate school vs. 4 years of medical school plus 3–7 years of residency).
• PA vs. Registered Nurse (RN): Nursing and PA education follow different models entirely. PAs are trained in the medical model (diagnosing and treating disease), while nursing follows a patient-care model. PAs can also perform certain surgical tasks that fall outside an RN’s scope of practice.
• PA vs. Medical Assistant: This is the biggest misconception. Medical assistants typically handle administrative and basic clinical support tasks. PAs are licensed providers who diagnose and treat patients independently within their supervising relationship.

The Path to Becoming a PA

Becoming a PA is a graduate-level career, meaning it requires education beyond a bachelor’s degree. Here’s what the path typically looks like:

1. Undergraduate prerequisites. Aspiring PAs complete coursework in biology, chemistry, anatomy and physiology, psychology, and statistics, alongside a bachelor’s degree in a related field.

2. Clinical and patient care experience. Most PA programs expect applicants to have real hands-on healthcare experience before applying, shadowing, CNA work, EMT experience, or similar patient-facing roles.

3. PA school. Graduate PA programs typically run 24–30 months. The first year or so covers foundational medical sciences (anatomy, physiology, pharmacology, pathology), followed by more clinically focused coursework, and finally roughly a year of clinical rotations across specialties like family medicine, surgery, emergency medicine, and pediatrics.

4. Licensure. After graduating, PAs must pass the Physician Assistant National Certifying Examination (PANCE) to earn the credential “PA-C” and become licensed to practice.

What Makes PA School Competitive

PA programs are competitive, and admissions committees are typically looking for a combination of:

• A strong GPA, particularly in science prerequisites
• Documented patient care or clinical experience hours
• Strong letters of recommendation
• A compelling personal statement
• Interview performance

This is exactly where your undergraduate path matters most. Students who start their prerequisite coursework early, track their clinical hours consistently, and get structured guidance along the way tend to be far more competitive applicants than those piecing it together on their own.

Career Outlook for Physician Assistants

According to the U.S. Bureau of Labor Statistics, physician assistants earn a median annual salary of $133,260, with employment projected to grow 20% from 2024 to 2034, among the fastest-growing occupations in the country, and about 12,000 openings projected each year. That combination of strong pay and high demand makes it one of the more attractive graduate healthcare paths available.

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A Faster, More Direct Path: CSM’s Pre-PA Pathway

Most students pursuing a PA career spend four years earning a bachelor’s degree, then face a separate, highly competitive PA school application process, one that can take a year or more, with no guarantee of acceptance anywhere.

College of Saint Mary’s Pre-PA Pathway removes that gap entirely. It’s a direct entry, accelerated PA program, structured as a 3+2 model: three years of undergraduate coursework followed directly by two years in CSM’s Master of Science in Physician Assistant Studies (MSPAS) program. As long as you meet your progression benchmarks, GPA, prerequisite coursework, and clinical experience, admission into the MSPAS program is guaranteed. No separate application. No waiting to find out if you got in.

That means a student can go from high school to a licensed, practicing PA in as little as five years, with a dedicated advisor tracking your progress every semester along the way.