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
                        MARCH 23, 2000
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              (Date of earliest event reported)


         LABORATORY CORPORATION OF AMERICA HOLDINGS
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   (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
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          (Address of principal executive offices)

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


ITEM 5. OTHER EVENTS On March 23, 2000, Laboratory Corporation of America- Registered Trademark- Holdings (LabCorp-Registered Trademark-) announced the signing of an agreement to provide ViroLogic Inc.'s phenotypic HIV drug susceptibility assay, PhenoSense-Trademark- HIV, through LabCorp's national laboratory services network. This agreement adds PhenoSense-Trademark- HIV to LabCorp's existing phenotyping and genotyping test menu, further expanding LabCorp's extensive HIV testing services and offering increased physician choice. Terms of the agreement have not been disclosed. ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS (c) Exhibit 20 Press release of the Company dated March 23, 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: March 29, 2000


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

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

        LABORATORY CORPORATION OF AMERICA-REGISTERED TRADEMARK- ANNOUNCES
    PARTNERSHIP WITH VIROLOGIC INC. TO EXPAND HIV RESISTANCE TESTING SERVICES

Burlington, NC, March  23, 2000 - Laboratory Corporation of
America-Registered Trademark- Holdings (LabCorp-Registered
Trademark-) (NYSE: LH) today announced the signing of an
agreement to provide ViroLogic Inc.'s phenotypic HIV drug
susceptibility assay, PhenoSense-Trademark- HIV, through
LabCorp's national laboratory services network.  This agreement
adds PhenoSense-Trademark- HIV to LabCorp's existing phenotyping
and genotyping test menu, further expanding LabCorp's extensive
HIV testing services and offering increased physician choice.
Terms of the agreement have not been disclosed.

The  FDA's  Antiretroviral Advisory Committee recently  concluded
that resistance tests should be used to help develop new drugs to
combat  HIV. In addition, a panel led by the Department of Health
and  Human Services recently issued guidelines that recommend the
routine  use  of resistance tests for treating HIV patients.  The
use  of  phenotypic  HIV resistance testing in  making  treatment
choices  has  been  shown to significantly  improve  outcomes  of
patients  who  had  failed previous therapy.   As  a  pioneer  in
identifying  and commercializing leading-edge diagnostic  testing
services, LabCorp was the first national laboratory to offer  HIV
viral  load  testing in 1993, and later introduced HIV resistance
testing - each now established as standards of care.

"Less  than  two  years after our exclusive introduction  of  HIV
resistance  testing, we are pleased with the acceptance  of  both
genotypic  and  phenotypic testing, and the support  garnered  by
opinion  leaders, payors, and caregivers alike for this  critical
guidance  system," said Myla P. Lai-Goldman, MD,  executive  vice
president,  chief  scientific officer, and  medical  director  of
LabCorp.  "As new technologies become recognized as standards  of
care,  one of our most important responsibilities as the  leading
provider of specialized infectious disease testing is to  broaden
public  access  to  them.  Therefore,  LabCorp  will  offer   its
customers  the  choice  of ViroLogic's  assay  or  the  currently
offered  phenotypic method for HIV drug resistance.   We  believe
our  new relationship with ViroLogic will enhance patient  access
to this testing and improve turnaround time."

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. ViroLogic is a biotechnology company developing and marketing innovative products to guide and improve treatment of viral diseases. The Company has developed a practical way of directly measuring the impact of genetic mutations on drug resistance and using this information to guide therapy. The Company has a proprietary technology, called PhenoSense-Trademark-, for testing drug resistance in viruses that cause serious diseases such as AIDS, hepatitis B and hepatitis C. The Company's first product, PhenoSense HIV, is a test that directly and quantitatively measures resistance of a patient's HIV to anti-viral drugs. The Company is also developing PhenoSense products for other viral diseases and intends to use the results of its PhenoSense tests and other clinical data to develop its Therapy Guidance System- Trademark- (TGS-Trademark-), an interactive database to help physicians guide patient therapy. 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 LabCorp's financial results is included in LabCorp's Form 10-K for the year ended December 31, 1999. _______________________________