Quest Diagnostics Incorporated is one of the world's leading providers of diagnostic testing, information and services to patients and doctors. Based in Madison, N.J., the company offers access to diagnostic testing services through its network of laboratories and patient service centers, and provides interpretive consultation through its medical and scientific staff. Quest Diagnostics Incorporated also develops innovative diagnostic tests and advanced health care information technology solutions that help improve patient care. The company also is one of the largest providers of global central laboratory services performed in connection with clinical research trials on new drugs.