Quest Diagnostics Incorporated is a provider of diagnostic testing and related services for the healthcare industry. The Company offers a broad range of clinical laboratory testing services used by physicians in the detection, diagnosis, evaluation, monitoring and treatment of diseases and other medical conditions. The Company is engaged in clinical laboratory testing and esoteric testing, including molecular diagnostics, as well as anatomic pathology services and testing for drugs of abuse. The Company has a network of principal laboratories located in approximately 30 metropolitan areas throughout the United States, several joint-venture laboratories and approximately 150 smaller rapid-response laboratories and 1,300 patient service centers. The Company also operates an esoteric testing laboratory and development facility, known as Nichols Institute, located in San Juan Capistrano, California, as well as laboratory facilities in Mexico City, Mexico and near London, England.