UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 SCHEDULE 13G/A


                    Under the Securities Exchange Act of 1934

                               (Amendment No. 25)*


                                  LABONE, INC.
-------------------------------------------------------------------------------
                                (Name of Issuer)


                     Common Stock, $ .01 par value per share
-------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   50540L 10 5
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                                 (CUSIP Number)


                                  May 20, 2002
-------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

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

           /  / Rule 13d-1(b)
           /  / Rule 13d-1(c)
           /X/  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).

                               Page 1 of 4 pages



-------------------------------------------------------------------------------
CUSIP NO. 50540L 10 5
-------------------------------------------------------------------------------
(1)   Names of Reporting Persons
      I.R.S. Identification Nos. of Above Persons (entities only)

           William D. Grant
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(2)   Check the Appropriate Box if a Member of a Group        (a) / /
                                                              (b) / /
      Inapplicable
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(3)   SEC Use Only
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(4)   Citizenship or Place of Organization

      United States
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                    (5)  Sole Voting Power
                         165,161
Number of Shares
Beneficially    ---------------------------------------------------------------
Owned by            (6)  Shared Voting Power
Each                     0
Reporting
Person
With:           ---------------------------------------------------------------
                    (7)  Sole Dispositive Power
                         165,161

                ---------------------------------------------------------------
                    (8) Shared Dispositive Power
                     0
-------------------------------------------------------------------------------
(9)   Aggregate Amount Beneficially Owned By Each Reporting Person

      165,161
-------------------------------------------------------------------------------
(10)  Check if the Aggregate Amount in Row (9) excludes Certain Shares

      / /
-------------------------------------------------------------------------------
(11)  Percent of Class Represented by Amount in Row (9)

      1.5%

-------------------------------------------------------------------------------
(12)  Type of Reporting Person

      IN
-------------------------------------------------------------------------------

                               Page 2 of 4 pages



ITEM 1.

      (a)  Name of Issuer:  LabOne, Inc. ("Issuer")

      (b)  Address of Issuer's Principal Executive Offices:

           10101 Renner Boulevard
           Lenexa, Kansas  66219

ITEM 2.

      (a)  Name of Person Filing:  William D. Grant

      (b)  Address of Principal Business Office or, if none, Residence:

           One Ward Parkway
           Suite 130
           Kansas City, MO  64112

      (c)  Citizenship:  United States

      (d)  Title of Class of Securities:  Common Stock, $ .01 par value
           per share
                              ("Common Stock")

      (e)  CUSIP Number:  50540L 10 5

ITEM       3. If this statement is filed pursuant to Sections 240.13d-1(b), or
           240.13d-2(b) or (c), check whether the person filing is a:

           Not applicable.

ITEM 4.    Ownership.

      (a) Amount Beneficially Owned: 165,161 shares, which are held directly.
The reporting person no longer acts as co-trustee with UMB Bank, N.A. for
six family trusts as reported in prior filings and no longer shares the power
to vote or dispose of the shares held by these trusts.

      (b)  Percent of Class: 1.5%

      (c)  Number of shares as to which the person has:

           (i)   sole power to vote or to direct the vote: 165,161

           (ii)  shared power to vote or to direct the vote:  0

           (iii) sole power to dispose or to direct the disposition of: 165,161

           (iv) shared power to dispose or to direct the disposition of: 0


                               Page 3 of 4 pages



ITEM 5.    Ownership of Five Percent or Less of a Class.

           This statement is being filed to report the fact that as of May 22,
           2002 (the date hereof) the reporting person has ceased to be the
           beneficial owner of more than 5% of the Common Stock.

ITEM 6.    Ownership of More Than Five Percent on Behalf of Another Person.

           Not applicable.

ITEM 7.    Identification and Classification of the Subsidiary Which Acquired
           the Security Being Reported on by the Parent Holding Company.

           Not applicable.

ITEM 8.    Identification and Classification of Members of the Group.

           Not applicable.

ITEM 9.    Notice of Dissolution of Group.

           Not applicable.

ITEM 10.   Certification.

           By signing below I certify that, to the best of my knowledge and
           belief, the securities referred to above were not acquired and are
           not held for the purpose of or with the effect of changing or
           influencing the control of the Issuer of the securities and were not
           acquired and are not held in connection with or as a participant in
           any transaction having that purpose 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.

                                             /s/ W. D. Grant
                                           ------------------------------------
                                           W. D. Grant

Dated:  May 23, 2002


                               Page 4 of 4 pages