Item 3.03. Material Modification to Rights of Security Holders

In connection with the repayment on May 31, 2012 by Quest Diagnostic Incorporated (the "Company") of all amounts outstanding under its Credit Agreement, dated as of May 31, 2007, among the Company, the Guarantors a party thereto, the lenders party thereto from time to time, Bank of America, N.A., as Administrative Agent, Morgan Stanley Senior Funding, Inc., as Syndication Agent, and Barclays Bank Plc, JPMorgan Chase Bank, N.A., Merrill Lynch Bank, USA and Wachovia Bank, National Association, as Co-Documentation Agents, the guarantees by the Company's subsidiary guarantors with respect to all of the Company's outstanding senior notes, with an outstanding aggregate principal amount of approximately $3.3 billion, were released. You should read Note 11 to the Company's annual financial statements included in the Company's Form 10-K for the fiscal year ended December 31, 2011 (filed February 16, 2012) for a listing of the Company's outstanding senior notes.