RESTATED CERTIFICATE OF INCORPORATION OF Unilab Corporation UNILAB CORPORATION, a Delaware corporation, hereby certifies as follows: 1. The name of the Corporation is Unilab Corporation. The date of the filing of its original Certificate of Incorporation with the Secretary of State of the State of Delaware was September 24, 1990, and the Corporation filed a Certificate of Amendment to its Certificate of Incorporation with the Secretary of State of the State of Delaware on May 23, 1991. 2. This Restated Certificate of Incorporation amends and restates the provisions of the Certificate of Incorporation of the Corporation and was duly adopted in accordance with the provisions of Sections 242 and 245 of the General Corporation Law of the State of Delaware. 3. The text of the Certificate of Incorporation is hereby amended and restated in its entirety to read as follows: "ARTICLE I Name The name of the corporation is DPD Holdings Inc. (the "Corporation"). ARTICLE II Registered Office and Registered Agent The address of the registered office of the Corporation in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle. The name of the registered agent of the Corporation at such address is The Corporation Trust Company. 1 ARTICLE III Corporate Purpose The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the "General Corporation Law"). ARTICLE IV Capital Stock The total number of shares of all classes of stock that the Corporation shall have authority to issue is 10,000, all of which shall be shares of Common Stock, par value $.01 per share. ARTICLE V Directors SECTION 1. Elections of directors of the Corporation need not be by written ballot, except and to the extent provided in the By-laws of the Corporation. SECTION 2. To the fullest extent permitted by the General Corporation Law as it now exists and as it may hereafter be amended, no director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director. ARTICLE VI Indemnification of Directors, Officers and Others SECTION 1. The Corporation shall to the fullest extent permitted by the provisions of the General Corporation Law of Delaware, as now or hereafter in effect, indemnify all persons whom it may indemnify under such provisions. The indemnification provided by this Section shall not limit or exclude any rights, indemnities or limitations of liability to which any person may be entitled whether as a matter of law, under the By-laws of the Corporation, by agreement, vote of the stockholders or disinterested directors of the Corporation or otherwise. 2 SECTION 2. The personal liability of the directors of the Corporation is hereby eliminated to the fullest extent permitted by paragraph (7) of Subsection (b) of Section 102 of the General Corporation Law of Delaware, as the same may be amended and supplemented. ARTICLE VII By-laws The directors of the Corporation shall have the power to adopt, amend or repeal by-laws. ARTICLE VIII Reorganization Whenever a compromise or arrangement is proposed between this Corporation and its creditors or any class of them and/or between this Corporation and its stockholders or any class of them, any court of equitable jurisdiction within the State of Delaware may, on the application in a summary way of this Corporation or of any creditor or stockholder thereof or on the application of any receiver or receivers appointed for this Corporation under the provisions of section 291 of Title 8 of the Delaware Code or on the application of trustees in dissolution or of any receiver or receivers appointed for this Corporation under the provisions of section 279 of Title 8 of the Delaware Code order a meeting of the creditors or class of creditors, and/or of the stockholders or class of stockholders of this Corporation, as the case may be, to be summoned in such manner as the said court directs. If a majority in number representing three-fourths in value of the creditors or class of creditors, and/or of the stockholders or class of stockholders of this Corporation, as the case may be, agree to any compromise or arrangement and to any reorganization of this Corporation as consequence of such compromise or arrangement, the said compromise or arrangement and the said reorganization shall, if sanctioned by the court to which the said application has been made, be binding on all the creditors or class of creditors, and/or on all the stockholders or class of stockholders, of this Corporation, as the case may be, and also on this Corporation. 3 ARTICLE IX Amendment The Corporation reserves the right to amend, alter, change or repeal any provision of this Certificate of Incorporation, in the manner now or hereafter prescribed by law, and all rights conferred on stockholders in this Certificate of Incorporation are subject to this reservation." IN WITNESS WHEREOF, DPD HOLDINGS INC. has caused this certificate to be signed by Andrew H. Baker, its Chairman of the Board, President and Chief Executive Officer, and attested by Mark L. Bibi, its Secretary, as of this 10th day of November, 1993. UNILAB CORPORATION By /s/ Andrew H. Baker ---------------------------- Andrew H. Baker Chairman of the Board, President and Chief Executive Officer ATTEST: /s/ Mark L. Bibi - --------------------------- Mark L. Bibi Secretary 4 CERTIFICATE OF MERGER OF AMERICAN CLINICAL LABORATORIES, INC. DAMON CLINICAL LABORATORIES, INC. DAMON CLINICAL LABORATORIES-HOUSTON, INC. MEDLAB INC. MPC LABORATORY, INC. NICHOLS INSTITUTE PROFESSIONAL SERVICES ORGANIZATION, INC. NICHOLS GP CORPORATION NICHOLS LP CORPORATION NICHOLS INSTITUTE SUBSTANCE ABUSE TESTING LABORATORIES, INC. PATHLAB, INC. AND REDWOOD MEDICAL LABORATORY INTO DPD HOLDINGS INC. Pursuant to Section 252 of the General Corporation Law of the State of Delaware * * * * The undersigned hereby certifies that: 1. The name of and state of incorporation of each of the constituent corporations are as follows: Name State of Incorporation AMERICAN CLINICAL LABORATORIES, INC. California DAMON CLINICAL LABORATORIES, INC. Texas DAMON CLINICAL LABORATORIES - Texas HOUSTON, INC. MEDLAB INC. Oregon MPC LABORATORY, INC. Texas NICHOLS INSTITUTE PROFESSIONAL California SERVICES ORGANIZATION, INC. NICHOLS GP CORPORATION California NICHOLS LP CORPORATION California NICHOLS INSTITUTE SUBSTANCE ABUSE Delaware 5 TESTING LABORATORIES, INC. PATHLAB, INC. Texas REDWOOD MEDICAL LABORATORY California DPD HOLDINGS INC. Delaware 2. An Agreement and Plan of Merger dated as of December 6, 1994 (the "Merger Agreement") among each of the constituent corporations has been approved, adopted, certified, executed and acknowledged by each of the constituent corporations in accordance with the requirements of Section 252(c) of the General Corporation Law of the State of Delaware. 3. The name of the surviving corporation is DPD Holdings Inc. 4. The Certificate of Incorporation of DPD Holdings Inc. in effect at the effective time of the merger shall be the Certificate of Incorporation of the surviving corporation. 5. The surviving corporation is a corporation of the State of Delaware. 6. The executed Merger Agreement is on file at the principal place of business of the surviving corporation at One Malcolm Avenue, Teterboro, New Jersey 07608. 7. A copy of the Merger Agreement will be furnished by the surviving corporation, on request and without cost, to any stockholder of any constituent corporation. 8. The authorized capital stock of each constituent corporation which is not a Delaware corporation is as follows: Name Authorized Capital Stock AMERICAN CLINICAL LABORATORIES, INC. 50,000 shares, no par value DAMON CLINICAL LABORATORIES, INC. 1,000 shares, no par value DAMON CLINICAL LABORATORIES - 1,000 shares, no par value HOUSTON, INC MEDLAB, INC. 375,000 shares, no par value MPC LABORATORY, INC 1,000 shares, $.01 par value NICHOLS INSTITUTE PROFESSIONAL 10,000 shares, no par value SERVICES ORGANIZATION, INC. NICHOLS GP CORPORATION 1,000 shares, $.01 par value NICHOLS LP CORPORATION 1,000 shares, $.01 par value PATHLAB, INC. 1,000 shares, $.01 par value REDWOOD MEDICAL LABORATORY 75,000 shares, $1.00 par value 9. That the merger shall become effective at 9:00 P.M. on December 30, 1994. 6 IN WITNESS WHEREOF, this Certificate of Merger has been executed on this 6th day of December, 1994. Attest: DPD HOLDINGS INC. /s/ Leo C. Farrenkopf, Jr. By: /s/ James D. Chambers - -------------------------- ------------------------- Leo C. Farrenkopf, Jr. James D. Chambers Secretary Vice President 7