To the Editor.
—As one involved in the development of one of the earlier programs for the use of physician's assistants in the practice of internal medicine, I would like to express my appreciation of the editorial, "Differential Certification of Physician's Assistants," by Dr. Jay S. Skyler in the August 1973 issue of the Archives. If certification of physician's assistants becomes a requirement, we certainly must make such certification purposeful, and to accomplish this certification should be tailored to the situation. We, for example, have implemented a physician's assistant program in peripheral vascular disease and the present incumbent has been functioning in a manner that has met with universal acceptance by the physicians, the patients, and the lay personnel involved in the patients' care. This physician's assistant had her training, and has functioned, exclusively within the field of peripheral vascular disease. She has not had any training in general medicine.