March 1, 2007

LabCorp(R) Notified by Aetna of Contract Termination

BURLINGTON, N.C., March 1 /PRNewswire-FirstCall/ -- Laboratory Corporation of America(R) Holdings (LabCorp(R)) (NYSE: LH), one of the world's leading clinical laboratories, today announced that it will no longer be a contracted laboratory provider for Aetna Inc. (NYSE: AET), effective July 1, 2007.