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                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                          (AMENDMENT NO. ___________)*

                         Sontra Medical Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                     Common
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  00083568W109
            --------------------------------------------------------
                                 (CUSIP Number)

                                    12/31/03
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ X ] Rule 13d-1(b)

[   ] Rule 13d-1(c)

[   ] Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or



otherwise subject to the liabilities of that section of the Act but shall be
subject to all other provisions of the Act (however, see the Notes).

CUSIP No.  00083568W109

- -------------------------------------------------------------------------------

  1. Names of Reporting Persons
     I.R.S. Identification Nos. of above persons (entities only).
     Hambrecht & Quist Capital Management LLC
     01- 0628853

- -------------------------------------------------------------------------------

  2. Check the Appropriate Box if a Member of a Group (See Instructions)
     (a)
     (b)  X

- -------------------------------------------------------------------------------

  3. SEC Use Only


- -------------------------------------------------------------------------------

  4. Citizenship or Place of Organization
     Delaware

- -------------------------------------------------------------------------------

Number of      5. Sole Voting Power
Shares              1,048,202
Beneficially
Owned by       -----------------------------------------------------------------
Each           6. Shared Voting Power    N/A
Reporting
Person With    -----------------------------------------------------------------
               7. Sole Dispositive Power    1,048,202

               -----------------------------------------------------------------
               8. Shared Dispositive Power    N/A

- -------------------------------------------------------------------------------

  9. Aggregate Amount Beneficially Owned by Each Reporting
     Person    1,048,202



- -------------------------------------------------------------------------------

 10. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)

- -------------------------------------------------------------------------------

 11. Percent of Class Represented by Amount in Row (11)    10.66

- -------------------------------------------------------------------------------

 12. Type of Reporting Person (See Instructions)

     IA

- -------------------------------------------------------------------------------



                           SCHEDULE 13G EXHIBIT

ITEM 1.
     Sontra Medical Corporation
     10 Forge Parkway
     Franklin, MA  02038

ITEM 2.
     Hambrecht & Quist Capital Management LLC
     30 Rowes Wharf - 4th Floor
     Boston, MA  02110-3328


     Common stock
     CUSIP: 00083568W109

ITEM 3.
     (e)  Investment Adviser

ITEM 4.
     Hambrecht & Quist Capital Management LLC ("HQCM") disclaims any
     beneficial interest in the shares reported in this Schedule 13G.
     Moreover, HQCM is of the view that the client accounts that it manages
     are not acting as a "group" for purposes of Section 13(d) under the
     Securities and Exchange Act of 1934 (the "1934 Act") and that it and
     such clients are not otherwise required to attribute to each other the
     "beneficial ownership" of securities "beneficially owned" under Rule
     13d-3 promulgated under the 1934 Act.  Therefore, HQCM is of the view
     that the shares held in such accounts should not be aggregated for
     purposes of Section 13(d).  However, HQCM is making this filing on a
     voluntary basis as if all the shares are beneficially owned by HQCM on a
     joint basis.

     1,048,202 shares of Common stock beneficially owned
     10.66% of Common
     1,048,202 sole voting power (i) and sole dispositive power (iii)

ITEM 5.
     N/A

ITEM 6.
     Of the 1,048,202 shares of the Common stock reported above, 629,621
     shares are held by H&Q Healthcare Investors, a registered investment
     company, which represents 6.4% of the issuer's Outstanding Common stock.

ITEM 7.
     N/A

ITEM 8.
     N/A

                                     E-1



ITEM 9.
     N/A

ITEM 10.
     By signing below I certify that, to the best of my knowledge and belief,
     the securities referred to above were acquired in the ordinary course of
     business and were not acquired for the purpose of and do not have the
     effect of changing or influencing the control of the issuer of such
     securities and were not acquired in connection with or as a participant
     in any transaction having such purposes or effect.

     After reasonable inquiry and to the best of my knowledge and belief, I
     certify that the information set forth in this statement is true,
     complete and correct.

     Date:          5-14-04
                    ----------------------------------------------

     Signature:     _______________________________________________
     Name/Title:     Kim Carroll, Vice President
                     Hambrecht & Quist Capital Management LLC

                                     E-2