Laboratory Corporation of America® Holdings (LabCorp®) is much more than a routine clinical laboratory. As a pioneer in genomic testing and the commercialization of new diagnostic technologies, LabCorp is one of the world's largest clinical laboratories, with annual revenues of $3.3 billion in 2005. Headquartered in Burlington, North Carolina, LabCorp has approximately 24,000 employees and offers a broad range of genomic/esoteric tests. Listed under the ticker symbol LH on the New York Stock Exchange (NYSE), LabCorp tests more than 370,000 specimens daily for over 220,000 clients nationwide.

Quest Diagnostics operates 24 hours a day, 7 days a week, 365 days a year, providing our customers with a comprehensive menu of routine and specialty laboratory tests and services. With the consolidated capabilities of our regional laboratories, expanding international presence and the additional esoteric capabilities of Nichols Institute, we are able to offer unequaled convenience in utilizing one laboratory for all diagnostic and prognostic clinical testing needs.

Concentra creates and delivers healthcare solutions, patient and claimant outcomes, and business results that make our customers more successful. We are the nation's leading provider of:- Workers' Compensation and other occupational healthcare services
- Outsourced, specialized cost management services for Group Health insurance companies, payer organizations and medical providers