EX-32.1 6 d757814dex321.htm EX-32.1 Prepared by R.R. Donnelley Financial -- EX-32.1

Exhibit 32.1

CERTIFICATION

I, Peter Maag, Chief Executive Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

 

  1. the Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, (the “Periodic Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

  2. information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of CareDx, Inc.

 

Date: August 28, 2014   By:  

/s/ Peter Maag

    Peter Maag
    President and Chief Executive Officer
    (Principal Executive Officer)