POWER OF ATTORNEY
KNOW ALL BY THESE PRESENTS, that the undersigned hereby authorizes Lori
F. Rafield or Leone D. Patterson of Diadexus, Inc., a Delaware corporation (the
"Company") and Glen Sato or Ron Metzger of Cooley LLP, to execute for and on
behalf of the undersigned, in the undersigned's capacity as an executive officer
of the Company, Forms 3, 4 and 5, and any amendments thereto, and cause such
form(s) to be filed with the United States Securities and Exchange Commission
pursuant to Section 16(a) of the Securities Act of 1934, relating to the
undersigned's beneficial ownership of securities in the Company. The undersigned
hereby grants to the attorney-in-fact full power and authority to do and perform
any and every act and thing whatsoever requisite, necessary or proper to be done
in the exercise of any of the rights and powers herein granted, as fully to all
intents and purposes as the undersigned might or could do personally present,
with full power of substitution, resubstitution or revocation, hereby ratifying
and confirming all that such attorney-in-fact, or such attorney's-in-fact
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorney-in-fact, in serving in such capacity at
the request of the undersigned, is not assuming, nor is the Company assuming,
any of the undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.
This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of, and transactions in, securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorney-in-fact.
In Witness Whereof, the undersigned has caused this Power of Attorney
to be executed as of this 15th day of July, 2015.
/s/ John Curnutte
