(MT) A branch of medicine concerned with the performance of laboratory determinations and analyses used in the diagnosis and treatment of disease and the maintenance of health.
FAGELSON
(MT) defined as the application of the principles of natural, physical, and biological sciences to the performance of laboratory procedures which aid in the diagnosis and treatment of diseases.
HEINEMANN
(MT) A profession concerned with providing information based on the performance of analytical tests on human body substances to detect evidence of or prevent disease or impairment and to promote and monitor good health.