Nurse practitioners and physician assistants revisited: do their practice patterns differ in ambulatory care?

The education and regulation of nurse practitioners and physician assistants would suggest unique role differentiations and practice functions between the professions. This study explored to what extent their practice patterns in primary care actually differ. It was hypothesized that the primary care services provided by nurse practitioners would tend to be women and family health services, health prevention and promotion oriented, provided to minority and socioeconomic disadvantaged patients, and less dependent on physician supervision. In contrast, the services provided by physician assistants would more likely be medical/surgical oriented; diagnostic, procedural, and technical in nature; likely to be in rural areas; and more dependent on physician supervision. The study used patient data from the National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care Survey. Although some differences emerged, the argument is not compelling to suggest strong, unique, practice differences across all ambulatory care settings between the two types of nonphysician providers. It is the specific type of ambulatory setting that influences the practice pattern for both provider groups. If practice patterns are less distinctive than previously believed, more opportunities for interdisciplinary education need to be explored, and health policies that promote a discipline-specific primary care workforce may need to be reexamined.