Laboratory Corporation of America ® Holdings (LabCorp ®) (NYSE: LH) announced today that for the period of March 12, 2013 to September 11, 2013, its Zero Coupon Convertible Subordinated Notes due 2021 (Zero Coupon Notes) will, subject to the terms of the Zero Coupon Notes, accrue contingent cash interest at a rate of no less than 0.125% of the average market price of a Zero Coupon Note for the five trading days ended March 6, 2013, in addition to the continued accrual of the original issue discount. Contingent cash interest, which the Company has determined to be approximately $1.49 per Note, will be payable to holders of the Zero Coupon Notes as of the record date, which is August 27, 2013. The payment of contingent cash interest is expected to be made on September 11, 2013. About LabCorp ® Laboratory Corporation of America ® Holdings, an S&P 500 company, is a pioneer in commercializing new diagnostic technologies and the first in its industry to embrace genomic testing. With annual revenues of $5.7 billion in 2012, over 34,000 employees worldwide, and more than 220,000 clients, LabCorp offers more than 4,000 tests ranging from routine blood analyses to reproductive genetics to companion diagnostics. LabCorp furthers its scientific expertise and innovative clinical testing technology through its Specialty Testing Group: The Center for Molecular Biology and Pathology, National Genetics Institute, ViroMed Laboratories, Inc, The Center for Esoteric Testing, Litholink Corporation, Integrated Genetics, Integrated Oncology, DIANON Systems, Inc, Monogram Biosciences, Inc, Colorado Coagulation, Cellmark Forensics, MedTox, and Endocrine Sciences. LabCorp conducts clinical trials testing through its LabCorp Clinical Trials division. LabCorp clients include physicians, government agencies, managed care organizations, hospitals, clinical labs, and pharmaceutical companies. To learn more about our company, visit our Web site at: www.labcorp.com. This press release contains forward-looking statements. Each of the 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, 2012, and subsequent SEC filings.