Exhibit 23.3 CONSENTS OF PERSONS NAMED TO BECOME A DIRECTOR Pursuant to Rule 438 under the Securities Act of 1933, as amended (the "Act"), the undersigned each hereby consent to the use of their name and any references to them as a person to become a director of Lab Holdings, Inc., a Missouri corporation (the name of which is to be changed to LabONE, Inc., the "Company"), in the Joint Proxy Statement/Prospectus constituting a part of the Company's Registration Statement on Form S-4, Registration No. 333-76131 which has been filed with the Securities and Exchange Commission pursuant to the Act, and in any future amendments thereto. This consent may be executed in counterparts, each of which will be deemed an original. Name Signature Date W. THOMAS GRANT II S/ W. T. GRANT JUNE 17, 1999 ------------------- JOSEPH H. BREWER, M.D. S/ JOSEPH H. BREWER JUNE 25, 1999 ------------------- WILLIAM D. GRANT, CLU S/ WILLIAM D. GRANT JUNE 15, 1999 ------------------- RICHARD A. RIFKIND, M.D. S/ RICHARD A. RIFKIND JUNE 23, 1999 ------------------- RICHARD S. SCHWEIKER S/ RICHARD S. SCHWEIKER JUNE 17, 1999 ----------------------- JAMES R. SEWARD S/ JAMES R. SEWARD JUNE 15, 1999 ------------------- ROBERT D. THOMPSON S/ ROBERT D. THOMPSON JUNE 18, 1999 --------------------- JOHN E. WALKER S/ JOHN E. WALKER JUNE 15, 1999 ------------------- R. DENNIS WRIGHT, ESQ S/ R DENNIS WRIGHT JUNE 16, 1999 ------------------- PETER C. BROWN S/ PETER C. BROWN JUNE 15, 1999 ------------------- CHESTER B. VANATTA S/ CHESTER B. VANATTA JUNE 28, 1999 --------------------- JANET M. STALLMEYER S/ JANET M. STALLMEYER JUNE 18, 1999 ----------------------