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

May 20, 2004
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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 9. Regulation FD Disclosure

On May 20, 2004, Laboratory Corporation of America -Registered Trademark-
Holdings (LabCorp -Registered Trademark-)(NYSE:LH) announced the offering of
the only buccal swab test for alpha 1-antitrypsin (AAT) deficiency, the most
common, modifiable genetic factor leading to chronic obstructive pulmonary
disease (COPD), the fourth leading cause of death in the United States.


99.1  Press release of the Company dated May 20, 2004.


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
                      and Secretary


Date: May 20, 2004

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

For Immediate Release
Contact:  Pamela Sherry - (336) 436-4855
Shareholder Direct: (800) LAB-0401
Company Information: www.LabCorp.com

LabCorp-Registered Trademark- Announces New Non-invasive Swab Test for
Alpha 1- Antitrypsin Deficiency

One in 12 People Have AAT Deficiency Gene; Early Detection Can Lead to
Prevention or Reduction of Chronic Disease

Burlington, NC, May 20, 2004 - Laboratory Corporation of America Holdings
(LabCorp-Registered Trademark-) (NYSE: LH) today announced the offering of the
only buccal swab test for alpha 1-antitrypsin (AAT) deficiency, the most
common, modifiable genetic factor leading to chronic obstructive pulmonary
disease (COPD), the fourth leading cause of death in the United States.  In
its severest forms, AAT deficiency can result in life-threatening lung or
liver disease.

In 2003, the American Thoracic Society and the European Respiratory Society
released new guidelines that recommended broadening the AAT testing population
to include individuals, and their close relatives, who have COPD, emphysema,
unresponsive asthma or unexplained liver disease. Before now, the only way to
diagnose AAT deficiency was through a blood test. Using LabCorp's new
DNA-based buccal swab test, physicians and patients can now adhere to these
guidelines through a simple, non-invasive swab of the inside cheek.

"AAT deficiency is as prevalent as cystic fibrosis, and is widely misdiagnosed
or under-diagnosed," said John Walsh, President and Chief Executive Officer
of the Alpha-1 Foundation, the leading research, education and consumer
organization for AAT deficiency. "Effective testing is critical, because once
diagnosed, the disease can be managed through pharmaceutical therapy
or lifestyle changes, such as smoking cessation and avoidance of environmental
triggers."

An estimated 100,000 Americans have the AAT deficiency, and another
25 million people are undetected carriers of the gene that causes it. Common
signs and symptoms of AAT deficiency include: family history of lung or
liver disease; shortness of breath; decreased exercise tolerance; asthma
that does not respond to treatment or year-round allergies; recurring
respiratory infections; rapid deterioration of lung function without history
of significant smoking; unexplained liver problems; and elevated liver
enzymes without an identified cause.

"By providing this simple collection option that tests for AAT deficiency
and enables more targeted treatment, we could possibly reduce the overall
health care burden of this and associated diseases," stated LabCorp's
Executive Vice President, Chief Scientific Officer and Medical Director
Myla P. Lai-Goldman, M.D. "We look forward to working with the
Alpha-1 Foundation and therapeutic providers to educate more people on the
threat of AAT deficiency and the ease with which this condition can now be
detected."

About LabCorp-Registered Trademark-
Laboratory Corporation of America-Registered Trademark-  Holdings is a pioneer
in commercializing new diagnostic technologies and the first in its industry
to embrace genomic testing. With annual revenues of $2.9 billion in 2003,
over 23,000 employees nationwide, and more than 220,000 clients, LabCorp
offers over 4,400 clinical assays ranging from 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, in Research Triangle Park, NC; National Genetics
Institute, Inc. in Los Angeles, CA; ViroMed Laboratories, Inc. based in
Minneapolis, MN; The Center for Esoteric Testing in Burlington, NC;
and DIANON Systems, Inc. based in Stratford, CT.  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.

About Alpha-1 Foundation
The Alpha-1 Foundation is dedicated to providing leadership and resources
that will result in increased research, improved health, worldwide detection
and a cure for AAT deficiency. The Foundation is the major funding
organization within the scientific community studying AAT deficiency,
and has funded more than $15 million in related research and programs,
including grants and awards at more than 34 institutions in North America
and Europe.

The Foundation's support of annual International Scientific Conferences
and a series of Critical Issues Workshops, and a growing number
of working groups and advisory committees have made possible the
exchange of ideas and concepts that have advanced the understanding of
a variety of genetic conditions.  The Foundation is headquartered in Miami,
Florida.  The majority of the Board of Directors is either diagnosed with
AAT deficiency or is a family member of an individual with it.  For more
information on AAT deficiency, visit the Foundation Web site, at
www.alphaone.org.


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, 2003 and subsequent SEC filings.