UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                   WASHINGTON, D.C. 20549

                          FORM 8-K

                       CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934
                        APRIL 4, 2000
                     ------------------
              (Date of earliest event reported)


         LABORATORY CORPORATION OF AMERICA HOLDINGS
         ------------------------------------------
   (Exact name of registrant as specified in its charter)


   DELAWARE                1-11353             13-3757370
 --------------          -----------         --------------
(State or other         (Commission         (IRS Employer
jurisdiction of         File Number)         Identification
incorporation)                                    Number)


   358 SOUTH MAIN STREET, BURLINGTON, NORTH CAROLINA 27215
   -------------------------------------------------------
          (Address of principal executive offices)

                        336-229-1127
                        ------------
    (Registrant's telephone number, including area code)


ITEM 5. OTHER EVENTS On April 4, 2000, Laboratory Corporation of America Holdings-Registered Trademark- (LabCorp-Registered Trademark-) announced that it signed an extension to its existing agreement with Aetna U.S. Healthcare to provide laboratory services to Aetna U.S. Healthcare members. Details of the long-term agreement were not disclosed. ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS (c) Exhibit 20 Press release of the Company dated April 4, 2000.

SIGNATURES Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. LABORATORY CORPORATION OF AMERICA HOLDINGS ------------------------------------------ (Registrant) By:/s/ BRADFORD T. SMITH ------------------------------ Bradford T. Smith Executive Vice President, General Counsel, Secretary and Compliance Officer Date: April 6, 2000


Laboratory Corporation of America-Registered Trademark- Holdings
358 South Main Street
Burlington, NC   27215
Telephone:  336-584-5171


Contact:  Pamela Sherry                       LabCorp Shareholder Direct
          336-436-4855                        800-LAB-0401
                                              www.labcorp.com


       LABORATORY CORPORATION OF AMERICA-REGISTERED TRADEMARK- ANNOUNCES
               NATIONAL AGREEMENT WITH AETNA U.S. HEALTHCARE

Burlington, NC, April 4, 2000 - Laboratory Corporation of
America-Registered Trademark- Holdings (LabCorp-Registered Trademark-)
(NYSE: LH) announced today that it has signed an extension to its
existing agreement with Aetna U.S. Healthcare to provide laboratory
services to Aetna U.S. Healthcare members.  Details of the long-term
agreement were not disclosed.

Effective April 1, LabCorp is one of the preferred national
providers offering clinical laboratory testing to members of
Aetna U.S. Healthcare's PPO, POS and indemnity plans
nationwide.  The agreement also provides the majority of Aetna
U.S. Healthcare's HMO members with access to the services
provided by LabCorp.

"We are delighted that Aetna U.S. Healthcare has selected
LabCorp and recognizes the value of providing physicians and
their patients with an alternative for laboratory services,"
said Thomas P. Mac Mahon, President and Chief Executive Officer
of LabCorp.  "LabCorp's national network is committed to
providing a full range of quality services to Aetna U.S.
Healthcare."

Laboratory  Corporation of America-Registered Trademark- Holdings
(LabCorp-Registered Trademark-) is a national  clinical  laboratory
with  annual  revenues  of  $1.7 billion  in  1999.   With  18,000
employees  and  over  100,000 clients nationwide, the company offers
more than 2,000 clinical tests  ranging  from  simple  blood analyses
to  sophisticated molecular  diagnostics.  LabCorp  leverages  its
expertise  in innovative  clinical testing technology with three
Centers  of Excellence. The Center for Molecular Biology and Pathology,
in Research   Triangle   Park  (RTP),  North  Carolina,   develops
applications  for  polymerase chain reaction (PCR)  technology.
Its  Center  for  Occupational Testing in RTP  is  the  world's
largest  substance abuse testing facility, and the  Center  for
Esoteric  Testing in Burlington, North Carolina,  performs  the
largest  volume of specialty testing in the network.  LabCorp's
clients  include  physicians,  state  and  federal  government,
managed  care organizations, hospitals, clinics, pharmaceutical
and Fortune 1000 companies, and other clinical laboratories.

Aetna U.S. Healthcare is the nation's leading health and related benefits organization, providing a full spectrum of products ranging from health maintenance organizations (HMO) to indemnity health insurance, group life and disability products, and dental, vision, and pharmacy benefits to approximately 29 million Americans. In addition, Aetna U.S. Healthcare provides quality measurement and improvement programs and data analysis for providers and purchasers of health care. To learn more about Aetna U.S. Healthcare, check out the website at www.aetnaushc.com. LabCorp noted that 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. Further information on potential factors that could affect each company's financial results is included in the Form 10-K for each for the year ended December 31, 1999 and subsequent SEC filings.