Physician assistants are often referred to as "mid-level" providers because they are sort of in between physicians and nurses in their clinical authority, although they are somewhat similar to Nurse Practitioners in their role.Sometimes, P.A.s are called "physician extenders" because they can see patients and charge for office visits without a physician's direct supervision. This allows a medical practice to see more patients, and earn more revenue, with less physicians. In many states, however, P.A.s must practice under indirect supervision from a physician, meaning a physician must be in the building, or sign off on all clinical orders and prescriptions written by a P.A.
To expedite the process and increase your chances of being accepted into a P.A. program, it helps if your Bachelor's degree is in a science such as biology. Otherwise, you may have to take a additional hours of prerequisite lab sciences before applying to a P.A. program.
Depending on the state laws, P.A.s may work very independently with minimal physician oversight, or in other states they may be supervised more closely. In any case, they have more clinical authority and independence than most nurses, but not as much as physicians.
In most states, physician assistants can see patients and diagnose them, prescribe medication, and perform procedures much like a physician would.Physician assistants can focus on a variety of medical specialties. Some of the most common are family medicine, internal medicine, surgery, orthopedics, and cardiology.
Some medical industry leaders feel that physician assistants are an integral part of the solution to the physician shortage. On the other hand, physicians cite the disparity in P.A. training as compared to physicians. (Physicians attend four years of medical school plus a minimum of three years in residency training, for a total of at least seven years, while the Physician Assistant training is a total of two years including clinical rotations.)
The American Academy of Physician Assistants (AAPA) is a great place to go for such specialized, detailed information including a list of accredited P.A. schools.

