1.3 PT vs PTA Scope of Practice (Critical)
Key Takeaways
- PTAs implement the plan of care (POC) written by a supervising Physical Therapist (PT); they do not perform initial evaluations, write or modify the POC, or perform discharge.
- Tests and measures that require clinical interpretation or diagnosis (such as initial goniometry establishing baseline, manual muscle testing for diagnosis, sensory integrity exams that drive the POC) are PT-only; PTAs perform data collection within the POC.
- PTAs may not perform sharp selective debridement, joint mobilization grade V (high-velocity thrust), wound selective debridement with a sharp instrument, or spinal manipulation in any U.S. jurisdiction.
- Supervision tiers vary by jurisdiction but generally fall into three categories: general (PT available by telecommunication), direct (PT on-site and immediately available), and direct personal (PT in the same room).
- When a question describes the PT "evaluating," "diagnosing," "establishing a prognosis," "writing or modifying the POC," or "discharging," the correct answer almost always involves the PTA notifying or referring to the PT - not acting independently.
Why scope of practice is the single most testable concept
Almost every clinical scenario on the NPTE-PTA can be filtered through one question: Is this action inside or outside the PTA's scope? If you can answer that quickly, you eliminate distractors in nearly every case-based item, regardless of body system. The exam writers know this is what protects the public, so it shows up directly in Professional Responsibilities items and indirectly throughout body-system items.
What a PTA CAN do
Under the supervision of a licensed PT, a PTA may:
- Carry out the established plan of care (POC) - deliver the interventions the PT has written into the POC.
- Implement therapeutic exercise - perform and progress strengthening, ROM, flexibility, endurance, neuromuscular re-education, and gait training within the POC.
- Apply therapeutic modalities - ultrasound, electrical stimulation, thermal agents, mechanical traction, and hydrotherapy, within parameters established in the POC.
- Perform data collection - re-measure ROM, repeat MMT, take vital signs, observe gait, time the Timed Up and Go (TUG), and document changes against the PT's baseline.
- Apply joint mobilization grades I-IV in jurisdictions and practice settings that permit it as a non-thrust technique, only when delegated by the PT.
- Provide patient and family education consistent with the POC.
- Modify treatment within the POC - adjust exercise dose, repetitions, or modality time within the parameters the PT documented.
- Recognize when to stop - hold an intervention if vital signs, pain, or function falls outside parameters the PT set, and notify the PT.
What a PTA CANNOT do
A PTA may never:
- Perform the initial examination or evaluation. This is the PT's exclusive responsibility because it establishes the diagnosis and prognosis.
- Establish, write, or substantively modify the plan of care. A PTA can suggest changes but only the PT can change the POC.
- Interpret tests and measures for diagnostic purposes. A PTA collects data; the PT interprets that data when it changes the diagnosis or POC.
- Perform sharp selective debridement with a scalpel, scissors, or other sharp instrument.
- Perform grade V joint mobilization (high-velocity, low-amplitude thrust) or spinal manipulation.
- Perform wound selective debridement that requires clinical judgment beyond non-selective methods (mechanical, autolytic) directed by the POC.
- Discharge the patient from physical therapy services.
- Supervise another PTA, PT aide, or student in a way that substitutes for PT supervision required by the jurisdiction.
- Bill or document under their own evaluation code - PTAs document interventions and progress against the PT's plan.
Supervision tiers
Each jurisdiction defines exactly how a PT must supervise a PTA. Three tiers appear repeatedly on the exam.
| Supervision tier | What it means | Common settings |
|---|---|---|
| General supervision | The PT is not required to be on site but is available by telecommunication (phone, video). Used in many outpatient and home-health settings for licensed PTAs. | Outpatient orthopedic clinics, home health, certain skilled nursing settings. |
| Direct supervision | The PT must be physically on site and immediately available, though not necessarily in the same room. | Many acute-care and inpatient rehab settings; required for PTA students in most jurisdictions. |
| Direct personal (continuous) supervision | The PT is in the same room, directly observing the intervention. | Often required for PTA students performing their first treatments and in some specialty procedures. |
Always read the question stem for clues about the setting and the PT's location. If the stem describes a PT working off-site by phone, you are in general supervision; if it describes a PT "in the next room" or "on site," you are in direct supervision; if it describes a PT "observing" the treatment, you are in direct personal supervision.
The decision filter for any case-based item
When a scenario asks what the PTA should do, run through this filter:
- Is the patient safe right now? If not, address the safety issue first (stop treatment, position safely, call for help).
- Is the requested action a PT-only function? (evaluation, diagnosis, POC change, discharge, sharp debridement, grade V mobilization). If yes, the PTA notifies the PT.
- Is the data point inside the parameters the PT set in the POC? If yes, continue the intervention. If outside, hold and notify the PT.
- Does the action require a level of supervision the setting does not currently have? If yes, the PTA waits or notifies the PT.
Most "What should the PTA do next?" items resolve to either continue within the POC or notify the supervising PT. When in doubt, notifying the PT is almost always the safer, more defensible answer than acting independently.
A PTA is treating a patient three days post-rotator-cuff repair. The patient reports new, sharp shoulder pain at 90 degrees of passive flexion, which was not documented in the initial evaluation. What is the PTA's most appropriate next action?
Which intervention is OUTSIDE the scope of practice for a PTA in every U.S. jurisdiction?