STANDARD & POOR’S RAISES LABCORP® CREDIT RATING TO INVESTMENT GRADE

Contact: 336-436-4855 Pamela Sherry Shareholder Direct: 800-LAB-0401 www.labcorp.com STANDARD & POOR'S RAISES LABCORP(R) CREDIT RATING TO INVESTMENT GRADE Two Level Upgrade Reflects Solid Operating Performance and Continuing Positive Trends Burlington, NC, November 10, 2000 -- Laboratory

LABORATORY CORPORATION OF AMERICA'S® HOUSTON TOXICOLOGY LABORATORY RECEIVES CERTIFICATION FROM SAMHSA

Contact: 336-436-4855 Pamela Sherry Shareholder Direct: 800-LAB-0401 www.labcorp.com LABORATORY CORPORATION OF AMERICA'S(R) HOUSTON TOXICOLOGY LABORATORY RECEIVES CERTIFICATION FROM SAMHSA Burlington, NC, November 6, 2000 -- Laboratory Corporation of America(R) Holdings (LabCorp(R)) (NYSE: LH)

LABORATORY CORPORATION OF AMERICA® REPORTS THIRD QUARTER RESULTS

Contact: Pamela Sherry www.labcorp.com LABORATORY CORPORATION OF AMERICA(R) REPORTS THIRD QUARTER RESULTS Revenue Increase of 13.9 Percent Led by Strong Volume Growth and Price Gains Burlington, NC, October 23, 2000 -- Laboratory Corporation of America(R) Holdings (LabCorp(R)) (NYSE: LH) today

ROCHE HOLDINGS, INC. COMPLETES SALE OF 3.625 MILLION SHARES OF LABCORP® COMMON STOCK

Contact: 336-436-4855 Shareholder Direct: 800-LAB-0401 Pamela Sherry www.labcorp.com ROCHE HOLDINGS, INC. COMPLETES SALE OF 3.625 MILLION SHARES OF LABCORP(R) COMMON STOCK Burlington, NC, October 16, 2000 -- Laboratory Corporation of America(R) Holdings (NYSE: LH) (LabCorp(R)) announced today that

LABCORP® FILES REGISTRATION STATEMENT TO ENABLE ROCHETO SELL UP TO 5.0 MILLION LABCORP® SHARES

Contact: 336-436-4855 Pamela Sherry Shareholder Direct: 800-LAB-0401 www.labcorp.com LABCORP(R) FILES REGISTRATION STATEMENT TO ENABLE ROCHE TO SELL UP TO 5.0 MILLION LABCORPÒ SHARES Burlington, NC, September 27, 2000 -- Laboratory Corporation of America(R) Holdings (NYSE: LH) (LabCorp(R))

LabCorp® Presents HIV Study Suggesting Frequently Monitored Patients Show Better Suppression of HIV Viral Load

Contact: 336-436-4855 Shareholder Direct: 800-LAB-0401 Pamela Sherry www.labcorp.com LabCorp(R) Presents HIV Study Suggesting Frequently Monitored Patients Show Better Suppression of HIV Viral Load LabCorp(R) releases the latest trends on HIV viral load to be presented at the Interscience

Laboratory Corporation of America® Signs Group Purchasing Agreement with HealthTrust Purchasing Group, L.P.

Contact: Pamela Sherry 336-436-4855 LABORATORY CORPORATION OF AMERICA® SIGNS GROUP PURCHASING AGREEMENT WITH HEALTHTRUST PURCHASING GROUP, L.P. Burlington, NC, August 24, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that it has signed a multi-year

LABORATORY CORPORATION OF AMERICA® COMPLETES ACQUISITION OFNATIONAL GENETICS INSTITUTE

Burlington, NC, August 1, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that it has completed the acquisition of Los Angeles-based National Genetics Institute, Inc. (NGI). Terms of the stock purchase transaction were not disclosed.

LABORATORY CORPORATION OF AMERICA® REPORTS RECORD SECOND QUARTER RESULTS ON STRONG VOLUME GROWTH

Burlington, NC, July 19, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced significantly improved results for the quarter and six months ended June 30, 2000. Second Quarter Results Net sales for the second quarter were $482.4 million, operating income was

LABORATORY CORPORATION OF AMERICA® SUCCESSFULLY COMPLETES PREFERRED STOCK REDEMPTION

Burlington, NC, July 13, 2000 — Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) today announced that more than 99.97 percent of the shares of its outstanding 8½ percent Series A Convertible Exchangeable Preferred Stock and 8½ percent Series B Convertible Pay-in-Kind Preferred