Working as a physician assistant in radiology requires completing PA school first, then building radiology-specific skills through on-the-job training or a postgraduate fellowship. There is no single standardized path, which is partly why this question comes up so often. The route you take depends on whether you want to work in diagnostic radiology, interventional radiology, or as a radiologist assistant, each of which has different training expectations and credential requirements.
PA School Comes First
Every path into radiology starts with becoming a licensed physician assistant. That means earning a bachelor’s degree (often in a science-heavy field), completing a master’s-level PA program accredited by the Accreditation Review Commission on Education for the Physician Assistant, and passing the Physician Assistant National Certifying Exam (PANCE). PA programs typically run about 27 months and include clinical rotations, though most don’t offer dedicated radiology rotations. If yours does, take it. If not, seek out elective time in radiology or interventional radiology during your clinical year.
Two Distinct Roles: PA vs. Radiologist Assistant
The term “radiology physician assistant” gets used loosely, but there are actually two different roles worth understanding. A PA working in radiology is a standard physician assistant who specializes in a radiology department, most commonly in interventional radiology. A radiologist assistant (RA) is a different credential entirely, typically held by radiologic technologists who complete additional graduate education and earn certification through the American Registry of Radiologic Technologists.
If you’re already on the PA track or hold a PA license, your path is through the PA side, not the RA side. PAs in radiology departments tend to work in interventional radiology, where they perform procedures, manage patients before and after interventions, and assist radiologists in the procedure suite. Some PAs also work in diagnostic radiology settings, helping with image-guided biopsies and patient consultations.
Postgraduate Radiology Fellowships for PAs
The fastest way to build radiology competence after PA school is a postgraduate fellowship designed specifically for advanced practice providers. These are 12-month programs that combine clinical training with procedural skills development. The University of Colorado Anschutz School of Medicine, for example, offers an Interventional Radiology Advanced Practice Provider Fellowship that trains both PAs and nurse practitioners. Graduates receive a certificate from the Colorado University School of Medicine verifying they’ve completed all curriculum components and achieved program competencies.
These fellowships are still relatively uncommon compared to other PA postgraduate programs, so competition can be stiff. If a formal fellowship isn’t available or practical, many PAs enter radiology by taking a position in an interventional radiology department that offers structured on-the-job training. Large academic medical centers are the most likely to have these opportunities, since their IR departments handle high procedure volumes and already have systems for training residents and fellows.
Procedures You’ll Learn
PAs in interventional radiology perform a wide range of image-guided procedures. The foundational skills include fine-needle aspiration (using a thin needle to collect cells for analysis), core biopsy (using a larger cutting needle to extract a tissue sample), percutaneous needle aspiration (draining fluid collections through a needle), and percutaneous catheter drainage (placing a small tube through the skin to continuously drain an abscess or fluid collection). All of these are performed under imaging guidance, typically ultrasound, CT, or fluoroscopy.
Beyond these basics, experienced radiology PAs may assist with or independently perform procedures like paracentesis, thoracentesis, lumbar punctures, central venous catheter placement, and various vascular access procedures. The specific procedures you’re permitted to perform depend on your training, your supervising radiologist’s comfort level, and your state’s scope of practice laws.
Supervision and Billing Rules
Since January 2021, Medicare rules explicitly allow PAs to supervise the performance of diagnostic tests, not just physicians. This was a meaningful expansion. The three supervision levels still apply to radiology procedures: general supervision (the physician oversees your work but doesn’t need to be present), direct supervision (the physician must be in the office suite and immediately available), and personal supervision (the physician must be in the room). Each procedure code in the Medicare fee schedule is assigned one of these levels.
When PAs personally perform diagnostic tests under their own practitioner benefit, the standard diagnostic test supervision requirements don’t apply. Instead, you practice under whatever supervision your state scope of practice laws require. This distinction matters for your day-to-day autonomy: in states with less restrictive supervision requirements, you may have considerably more independence.
State Licensing Varies Significantly
State regulation of radiology practice varies widely. Over 35 states and Washington, D.C. specifically regulate the “radiologist assistant” role, though each state handles it differently. Some states require a full license, others require certification, and a few simply require registration or holding a national credential. States like Arkansas, Connecticut, Kentucky, New York, and Virginia require licensure. Arizona and Florida use a certification model. Minnesota requires registration. Colorado requires you to hold a national credential.
For PAs (as opposed to radiologist assistants), your standard PA license is the primary credential, and your ability to practice in radiology falls under your state’s general PA scope of practice laws. Some states grant PAs broad procedural authority with physician collaboration, while others maintain stricter supervision requirements. Before committing to a position in a specific state, check both the PA practice act and any radiology-specific regulations.
Building Your Candidacy
If you’re still in PA school or recently graduated, several things can strengthen your application for radiology positions or fellowships. Clinical experience in emergency medicine or surgery builds procedural confidence and comfort with acute patients, both of which translate directly to interventional radiology work. Volunteering or shadowing in an IR department during school gives you exposure and connections. Familiarity with cross-sectional anatomy (the kind you see on CT and MRI) is essential, so any additional coursework or self-study in this area pays off.
Professional organizations offer networking and continuing education resources. The American College of Radiology provides membership sections for early-career professionals, a career center with job listings and salary data, and continuing medical education through its education center. Joining before you land your first radiology position gives you access to these tools during your job search.
The overall timeline from starting PA school to working independently in radiology is roughly four to five years: about 27 months for PA school, then either a 12-month fellowship or one to two years of on-the-job training before you’re handling a full procedural caseload with confidence. It’s a longer path than general practice PA work, but radiology PAs develop a procedural skill set that’s difficult to replicate in most other specialties.