SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                   ----------

                                    FORM 8-K

                 Current Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934

                                  July 31, 2003
                ------------------------------------------------
                Date of Report (Date of earliest event reported)

                                     CEPHEID
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)

      California                     000-0030755                  77-0441625
- ------------------------      ------------------------       -------------------
(State of incorporation)      (Commission file number)        (I.R.S. Employer
                                                             Identification No.)

                               904 Caribbean Drive
                               Sunnyvale, CA 94089
          ------------------------------------------------------------
          (Address of principal executive offices, including zip code)

                                 (408) 541-4191
              ----------------------------------------------------
              (Registrant's telephone number, including area code)




Item 7: Financial Statements and Exhibits

      (c) Exhibits.

      Number         Description
      ------         -----------

      99.01          Press release dated July 31, 2003.


Item 12: Results of Operations and Financial Condition

The  information  in this  report  and the  exhibit  attached  hereto  are being
furnished  pursuant  to Item 12 of Form 8-K and shall not be deemed  "filed" for
purposes of Section 18 of the Securities Exchange Act of 1934, nor shall they be
deemed  incorporated by reference in any filing with the Securities and Exchange
Commission  under  the  Securities  Act of 1934 or the  Securities  Act of 1933,
except as shall be expressly set forth by specific reference to such filing.

On July 31, 2003,  Cepheid  issued a press release  announcing  its  preliminary
financial  results for the first  quarter  ended June 30, 2003 and certain other
information. The press release is attached to this report as Exhibit 99.01.




                                   SIGNATURES

      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                                 CEPHEID

Date: July 31, 2003                          By: /s/ JOHN L. BISHOP
                                                 -------------------------------
                                                 Name: John L. Bishop
                                                 Title:  Chief Executive Officer




                                  Exhibit Index

Number         Description
- ------         -----------

99.01          Press release dated July 31, 2003.