American Society of Hematology disorders of the hematopoietic, hemostatic, and lymphatic systems, and disorders of the interaction between blood and the blood vessel wall. An American hematologist has trained in a subspecialty program approved by the American Board of Internal Medicine or the American Board of Pediatrics, or has acquired a comparable education in the field by alternate means, and is Board Certified (or eligible) in the subspecialty of hematology. Diagnostic expertise of a hematologist A hematologist is expert in the investigation, diagnosis, and management of disorders of the aforementioned organ systems through the use of the medical history, physical findings, specialized clinical laboratory
History of mental disorders of life/animation", had varied usage referring to a condition of the mind/soul. "Nervous", from an Indo-European root meaning to wind or twist, meant muscle or vigor, was adopted by physiologists to refer to the body's electrochemical signalling process (thus called the nervous system), and was then used to refer to nervous disorders and neurosis. "Obsession", from a Latin root meaning to sit on or sit against, originally meant to besiege or be possessed by an evil spirit, came to mean a fixed idea that could decompose the mind. With the rise of madhouses and the professionalization and specialization of medicine,