LabCorp(R) Notified by Aetna of Contract Termination



    BURLINGTON, NC, March 1 /CNW/ - Laboratory Corporation of America(R)
Holdings (LabCorp(R)) (NYSE:   LH), one of the world's leading clinical
laboratories, today announced that it will no longer be a contracted
laboratory provider for Aetna Inc. (NYSE:   AET), effective July 1, 2007.
    "We are disappointed with Aetna's decision, but we are confident in our
strategy for profitable growth," stated David P. King, Chief Executive Officer
of LabCorp. "Aetna has been a valued partner of ours for many years, and our
recent expansion in their core Northeast markets means that we will be able to
continue serving Aetna physicians and patients. We regret that we will do so
as an out-of-network provider."
    LabCorp estimates that its 2007 earnings per share will be reduced by
$0.04 to $0.12 primarily as a result of this contract termination.
    "We remain focused on our strategic plan, a key component of which is
expanding our managed care relationships and providing physicians and their
patients with the nation's most efficient, highest quality, and most advanced
laboratory diagnostics," said King.

    About LabCorp(R)

    Laboratory Corporation of America(R) Holdings, a S&P 500 company, is a
pioneer in commercializing new diagnostic technologies and the first in its
industry to embrace genomic testing. With annual revenues of $3.6 billion in
2006, over 25,000 employees nationwide, and more than 220,000 clients, LabCorp
offers clinical assays ranging from routine blood analyses to HIV and genomic
testing. LabCorp combines its expertise in innovative clinical testing
technology with its Centers of Excellence: The Center for Molecular Biology
and Pathology; National Genetics Institute, Inc.; ViroMed Laboratories, Inc.;
The Center for Esoteric Testing; DIANON Systems, Inc.; US LABS; and Esoterix
and its Colorado Coagulation, Endocrine Sciences, and Cytometry Associates
laboratories. LabCorp clients include physicians, government agencies, managed
care organizations, hospitals, clinical labs, and pharmaceutical companies. To
learn more about our growing organization, visit our Web site at:
www.LabCorp.com.

    Each of the above forward-looking statements is subject to change based
on various important factors, including without limitation, competitive
actions in the marketplace and adverse actions of governmental and other
third-party payors. Actual results could differ materially from those
suggested by these forward-looking statements. Further information on
potential factors that could affect LabCorp's financial results is included in
the Company's Form 10-K for the year ended December 31, 2006, and subsequent
SEC filings.





For further information:

For further information: Media, Pam Sherry, +1-336-436-4855, or
Investors, Scott Fleming, +1-336-436-4879, both of Laboratory Corporation of
America Holdings, or Shareholder Direct, 1-800-LAB-0401, Web Site:
http://www.labcorp.com

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LABORATORY CORPORATION OF AMERICA HOLDINGS

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