POWER OF ATTORNEY

KNOW ALL BY THESE PRESENTS, that the
undersigned hereby constitutes
and appoints Joseph Smith, his or her
true and lawful attorney-in-fact to:

(1)	execute for and on behalf of the
undersigned, in the undersigned's
capacity as a representative of Cepheid
(the "Company"), any and all Form ID, or
Forms 3,4 and 5 reports required to be
filed by the undersigned in accordance
with Section 16(a) of the Securities Act
of 1934 and the rules and regulations
thereunder with respect to transactions
in Ceheid securities.

(2)	do and perform any and all acts
for and on behalf of the undersigned
which may be necessary or desirable
to complete and execute any such
Form ID, or Forms 3, 4 and 5 and
timely file such forms with the
United States Securities and Exchange
Commission and any stock exchange or
similar authority; and

(3)	take any other action of any
type whatsoever in connection with
the foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to, in
the best interest of, or legally required by,
the undersigned, it being understood that the
document executed by such attorney-in-fact
on behalf of the undersigned pursuant to
this Power of Attorney shall be in such form
and shall contain such terms and conditions
as such attorney-in-fact may approve
in his discretion.

The undersigned hereby grants to such
attorney-in-fact full power and authority
to do and perform any and every act and
thing whatsoever requisite, 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 if personally
present, with full power of substitution or
revocation, hereby ratifying and confirming
all that such attorney-in-fact, or such
attorney-in-fact's 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 no such
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 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 or 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 24th day of April, 2008.


Signature:    /s/ Laurie King
Printed Name:   Laurie King