Exhibit 31.3
CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
I, Peter Maag, certify that:
| 1. | I have reviewed this Amendment No. 1 to Quarterly Report on Form 10-Q/A of CareDx, Inc.; |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: October 9, 2018 |
| By: |
| /s/ Peter Maag |
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| Peter Maag |
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| President and Chief Executive Officer |
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| (Principal Executive Officer) |
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