THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Diagnostic Products Corporation (DP)

3/30/2006 Proxy Information

Marilyn Ziering, Senior Vice President during 2005 and a more than 5% shareholder of the Company, is the mother of Michael Ziering, who is Chairman of the Board and Chief Executive Officer, and Ira Ziering, who is a director and Senior Vice President, Business and Legal. In 2005, Mrs. Ziering received salary and other benefits which totaled $181,454. Jason Aroesty, the son of Sidney Aroesty, President, serves as the managing director of the Company’s Scandinavian subsidiary. For 2005, Jason Aroesty received salary, bonus and other benefits which totalled $181,880. For 2005, Jonathan Olson and Eric Olson, sons of Douglas Olson, Chief Scientific Officer and President of the Company’s Instrument Systems Division, received salary and other benefits which totaled $67,050 and $129,350, respectively, as employees of the Instrument Systems Division.

During 2005, the Company reimbursed legal expenses incurred by certain executive officers in connection with certain governmental investigations and actions involving the Company pursuant to the Company’s indemnification agreements with such parties. These expenses did not exceed $60,000 as to any individual in 2005. Recently, two separate shareholder derivative complaints were filed in California Superior Court against certain current and former directors and officers of the Company alleging (i) that the defendants breached their fiduciary duties to the Company in connection with violations of the Foreign Corrupt Practices Act by the Company’s Chinese subsidiary and the Company’s alleged failure to comply with FDA rules and regulations governing clinical testing and submission of data, and (ii) that certain of the defendants traded in Company stock while in possession of material, non-public information. Pursuant to indemnification agreements with its officers and directors, DPC will advance expenses (including attorneys’ fees) incurred by such parties in defending against the actions.

Since 1981, the Company has leased a portion of its Los Angeles facility from a partnership comprised of Marilyn Ziering, Michael Ziering, Ira Ziering, and other children of Mrs. Ziering who are shareholders of the Company. During 2005, the Company paid $1,086,744 in rent to the Ziering partnership. In 2005 the Company exercised an option to extend the lease through December 31, 2006 at an annual rent of $1,086,744. The rent under the original lease and option was determined on the basis of various factors, including an independent appraisal, and the terms of the original lease and option were approved unanimously by the disinterested members of the Board of Directors, including all of the Company’s independent directors. The Company’s independent directors also unanimously approved the exercise of the option after considering two independent appraisals. The Company believes that the terms of the lease and option are at least as favorable as it could have obtained from unrelated third parties.

8/1/2005 Proxy Information

Marilyn Ziering, Senior Vice President and a more than 5% shareholder of the Company, is the mother of Michael Ziering, who is Chairman of the Board and Chief Executive Officer, and Ira Ziering, who is Vice President, Business and Legal, and a director. In 2004, Mrs. Ziering was paid salary and other benefits which totalled $164,773. Jason Aroesty, the son of Sidney Aroesty, President, serves as the managing director of the Company’s Scandinavian subsidiary. In 2004, Jason Aroesty was paid salary and other benefits which totalled $123,645. In 2004, Jonathan Olson and Eric Olson, sons of Douglas Olson, Chief Scientific Officer and President of the Company’s Instrument Systems Division, were paid salary and other benefits which totalled $84,041 and $101,975, respectively, as employees of the Instrument Systems Division.

During 2004, the Company reimbursed legal expenses incurred by various executive officers pursuant to the Company’s indemnification agreements with such parties. Except in the case of James Brill, whose reimbursed expenses totalled $61,574, these expenses did not exceed $60,000 as to any individual.

Since 1981, the Company has leased a portion of its Los Angeles offices from a partnership comprised of Marilyn Ziering, Michael Ziering, Ira Ziering, and other children of Mrs. Ziering who are shareholders of the Company. During 2004, the Company paid $1,035,000 in rent, or $.75 per square foot, to the Ziering partnership. The lease terminated on December 31, 2004, subject to the Company’s option to extend the term for two additional years at an annual rent of $1,086,744 or $.79 per square foot. The Company exercised this option in April 2005 effective as of January 1, 2005. The rent under the original lease was determined on the basis of various factors, including an independent appraisal, and the terms of the original lease were approved unanimously by the disinterested members of the Board of Directors, including all of the Company’s independent directors. The Company’s independent directors also unanimously approved the exercise of the option after considering two independent appraisals. The Company believes that the terms of the lease are at least as favorable as it could have obtained from unrelated third parties.

5/2/2005 10K Information

Michael Ziering and Ira Ziering are brothers and the sons of Marilyn Ziering, an executive officer and more than 10% shareholder of the Company.

Lehman Brothers, Inc. is a financial advisor to DP. Mr. Frank is an executive officer of Lehman Brothers and a less than 1% shareholder of the parent company of Lehman Brothers.

Marilyn Ziering, Senior Vice President and a more than 5% shareholder of the Company, is the mother of Michael Ziering, who is Chairman of the Board and Chief Executive Officer, and Ira Ziering, who is Vice President, Business and Legal, and a director. In 2004, Mrs. Ziering was paid salary and other benefits which totalled $164,773. Jason Aroesty, the son of Sidney Aroesty, President, serves as the managing director of the Company’s Scandinavian subsidiary. In 2004, Jason Aroesty was paid salary and other benefits which totalled $123,645. In 2004, Jonathan Olson and Eric Olson, sons of Douglas Olson, Chief Scientific Officer and President of the Company’s Instrument Systems Division, were paid salary and other benefits which totalled $84,041 and $101,975, respectively, as employees of the Instrument Systems Division.

During 2004, the Company reimbursed legal expenses incurred by various executive officers pursuant to the Company’s indemnification agreements with such parties. Except in the case of James Brill, whose reimbursed expenses totalled $61,574, these expenses did not exceed $60,000 as to any individual.

Since 1981, the Company has leased a portion of its Los Angeles offices from a partnership comprised of Marilyn Ziering, Michael Ziering, Ira Ziering, and other children of Mrs. Ziering who are shareholders of the Company.

During 2004, the Company paid $1,035,000 in rent, or $.75 per square foot, to the Ziering partnership. The lease terminated on December 31, 2004, subject to the Company’s option to extend the term for two additional years at an annual rent of $1,086,744 or $.79 per square foot. The Company exercised this option in April 2005 effective as of January 1, 2005. The rent under the original lease was determined on the basis of various factors, including an independent appraisal, and the terms of the original lease were approved unanimously by the disinterested members of the Board of Directors, including all of the Company’s independent directors. The Company’s independent directors also unanimously approved the exercise of the option after considering two independent appraisals. The Company believes that the terms of the lease are at least as favorable as it could have obtained from unrelated third parties.

3/29/2004 Proxy Information

Michael Ziering and Ira Ziering are brothers and the sons of Marilyn Ziering.

Marilyn Ziering, Senior Vice President and a more than 5% shareholder of the Company, is the mother of Michael Ziering, who is Chairman of the Board and Chief Executive Officer, and Ira Ziering, who is Vice President, Business and Legal, and a director. In 2003, Mrs. Ziering was paid an annual salary and received other benefits totalling $168,940.

Since 1981, the Company has leased its principal Los Angeles offices from a partnership comprised of Marilyn Ziering, Michael Ziering, Ira Ziering, and other children of Mrs. Ziering who are shareholders of the Company. During 2003, the Company paid $1,035,000 in rent, or $.75 per square foot, to the Ziering partnership. The lease terminates on December 31, 2004, subject to the Company’s option to extend the term for two additional years at $.79 per square foot. The rent was determined on the basis of an independent appraisal and the terms of the lease were approved unanimously by the disinterested members of the Board of Directors, including all of the Company’s independent directors.

3/28/2003 Proxy Information

Marilyn Ziering, Senior Vice President, is the mother of Michael Ziering, Chairman of the Board and Chief Executive Officer, and Ira Ziering, Vice President, Business and Legal, and a director. In 2002, Mrs. Ziering was paid an annual salary of $140,400 and Ira Ziering was paid an annual salary of $200,000 and a bonus of $22,500. They each also received perquisites comparable to those provided to other executive officers.

Since 1981, the Company has leased its principal Los Angeles offices from a partnership comprised of Marilyn Ziering, Michael Ziering, Ira Ziering, and other children of Mrs. Ziering who are shareholders of the Company. During 2002, the Company paid $966,000 in rent to the Ziering partnership. On April 1, 2002, the Company amended the lease to extend the term for two years through December 31, 2004 and to increase the rent from $.70 per square foot to $.75 per square foot, for a total annual rent of $1,035,000 effective January 1, 2003. The Company also has the option to extend the term for two additional years at $.79 per square foot. The rent was determined on the basis of an independent appraisal and the terms of the lease amendment were approved unanimously by the disinterested members of the Board of Directors.