Clinical laboratory testing is generally categorized as either of two general areas--clinical testing and anatomical pathology testing. Clinical and anatomical pathology procedures are frequently ordered as part of regular physician office visits and hospital admissions in connection with the diagnosis and treatment of illnesses. As such, clinical laboratory analysis is one of the most important sections of medical care. The purpose of this TriMark Publications report is to describe the specific segments of the clinical laboratory analysis business. The emphasis in this review is on those companies that are actively developing and marketing laboratory data for the clinical setting, including hospitals, independent labs, physician's offices and miscellaneous clinics. This study concentrates on the clinical laboratory industry in the U.S. It defines the dollar volume of sales in each major market and analyzes the factors that influence the size and the growth of the individual market segments. The study surveys some of the primary companies known to be marketing clinical laboratory data into the market. Each company is discussed in depth with a section on the history of the company, the product line, business and marketing analysis, and a subjective commentary of the position of the company in its market.