Laboratory Corporation of America® Announces National Agreement with Aetna U.S. Healthcare

Burlington, NC, April 4, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (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.

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

Burlington, NC, March 23, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced the signing of an agreement to provide ViroLogic Inc.'s phenotypic HIV drug susceptibility assay, PhenoSenseTM HIV, through LabCorp's national laboratory services network.

LABORATORY CORPORATION OF AMERICA® ANNOUNCES DEFINITIVE AGREEMENT TO ACQUIRE SAN DIEGO-BASED POISONLAB

Burlington, NC, March 6, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that it has entered into a definitive agreement with San Diego-based POISONLAB, Inc. to acquire all of the stock of POISONLAB's occupational substance abuse and clinical toxicology

LABORATORY CORPORATION OF AMERICA® REPORTS STRONG FOURTH QUARTER AND FULL YEAR RESULTS

Burlington, NC, February 15, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced results for the quarter and twelve months ended December 31, 1999. Fourth Quarter Results Net sales for the fourth quarter were $422.7 million, compared to net sales of $407.8

LABCORP TO OFFER LATEST HPV TEST

Gaithersburg, MD and Burlington, NC (January 14, 2000) – Digene Corporation (Nasdaq: DIGE) and Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) announced today that they have entered into an agreement whereby LabCorp will utilize the Digene Hybrid Capture II HPV Test for women with

LABCORP® CAPTURES VIRGINIA'S PUBLIC HEALTH CARE CONTRACT LABORATORY TESTING

Burlington, NC, December 16, 1999 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) announced today that it has been awarded a contract by the Commonwealth of Virginia Department of Mental Health, Mental Retardation and Substance Abuse Services to perform clinical laboratory

LABORATORY CORPORATION OF AMERICA® SERVES AS PREFERRED PROVIDER TO HUMANA'S EHI 1.4 MILLION MEMBERS

Burlington, NC, December 13, 1999 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that it has finalized an agreement with Humana (NYSE: HUM), as preferred provider of laboratory services for Humana's Employers Health Insurance Company (EHI).

CIGNA HEALTHCARE CHOOSES LABORATORY CORPORATION OF AMERICA® AS NATIONAL PROVIDER FOR SELECTED MARKETS

Burlington, NC, November 22, 1999 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) announced today that it has contracted as a national provider of laboratory services for CIGNA HealthCare's traditional indemnity, preferred-provider organization (PPO) and HMO products in select

HEALTHWORKS AND LABCORP EXPAND AGREEMENT TO ELECTRONICALLY CONNECT LABCORP'S HOSPITAL PARTNERS AND MEDIC PHYSICIAN PRACTICES

KING OF PRUSSIA, Pennsylvania, BURLINGTON, North Carolina, November 18, 1999: Healthworks Alliance, Inc. (Healthworks) and Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that LabCorp will utilize Healthworks' connectivity tools to electronically receive orders

LABORATORY CORPORATION OF AMERICA® REPORTS THIRD QUARTER RESULTS

Burlington, NC, October 20, 1999 - Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced results for the quarter and nine months ended September 30, 1999. Third Quarter Results Net sales for the third quarter were $428.6 million, operating income was $40.1 million, and