Specialists in clinical and laboratory medicine diagnose and treat diseases and physiological or psychiatric disorders and act as consultants to other physicians. Specialists in laboratory medicine study the nature, cause and development of diseases in humans. Specialists in clinical medicine usually work in private practice or in a hospital while those in laboratory medicine usually work in hospitals. Residents in training to become specialists in clinical and laboratory medicine are included in this unit group.

Specialists in surgery perform and supervise surgical procedures. Specialists in surgery usually work in hospitals. Residents in training to become specialists in surgery are included in this unit group.

General practitioners and family physicians diagnose and treat the diseases, physiological disorders and injuries of patients. They provide primary contact and continuous care toward the management of patients' health. They usually work in private practice, including group or team practices, hospitals and clinics. Residents in training to be general practitioners or family physicians are included in this unit group.

Veterinarians prevent, diagnose and treat diseases and disorders in animals and advise clients on the feeding, hygiene, housing and general care of animals. They can also perform surgical procedures. They work in private practice or may be employed by animal clinics, farms, laboratories, government or industry.