Quest Diagnostics Incorporated is one of the leading providers of diagnostic testing and health care information technology (IT) solutions that help improve patient care. Based in Syracuse, N.Y., the firm provides laboratory services performed in connection with clinical research trials on new drugs. It also offers anatomic pathology testing, such as biopsies and Pap tests. Quest Diagnostics Incorporated operates a network of specimen collection sites with more than 2,000 patient service centers located throughout the United States.