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<TITLE>LabOne, Inc. Form 8-K dated July 8, 2004</TITLE>
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<FONT SIZE=5><STRONG><P ALIGN="CENTER">UNITED STATES SECURITIES AND EXCHANGE COMMISSION</P>
</FONT></STRONG><FONT SIZE=4><P ALIGN="CENTER">Washington, D.C. 20549</P>
</FONT><FONT SIZE=5><STRONG><P ALIGN="CENTER">FORM 8-K</P>
</FONT></STRONG><P ALIGN="CENTER">CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934</P>
<P ALIGN="CENTER">Date of Report: <U>July 8, 2004</P>
</U><P ALIGN="CENTER">Commission file number: 0-16946</P>
<B><U><FONT FACE="Times,Times New Roman" SIZE=5><P ALIGN="CENTER">LabOne, Inc.</P>
</B></U></FONT><P ALIGN="CENTER">10101 Renner Blvd.</P>
<P ALIGN="CENTER">Lenexa, Kansas 66219</P>
<P ALIGN="CENTER">(913) 888-1770</P>
<FONT FACE="Times,Times New Roman"><P ALIGN="CENTER">Incorporated in Missouri</P>
<P ALIGN="CENTER">I.R.S. Employer Identification Number: 43-1039532</P>
</FONT><FONT FACE="Times,Times New Roman" SIZE=2><P>&nbsp;</P>
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<FONT FACE="Times,Times New Roman"><P>Item 9.&nbsp;&nbsp;Regulation FD Disclosure</P>
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<P ALIGN="CENTER"><B>LabOne Announces Exercise of Option to Purchase Additional Convertible Senior Debentures</B></P>

<P>LabOne, Inc. (Nasdaq: LABS), announced today that the initial purchasers exercised their option to purchase an additional $13.5 million principal amount of the Company's 3.50% convertible senior debentures due 2034.  The Company used approximately $87 million of the initial proceeds of the offering to reduce borrowings under its credit facility.  The additional proceeds of approximately $13 million will be used by the Company to pay the remaining borrowings under its credit facility and for general corporate purposes. </P>

<P>This report on Form 8-K does not constitute an offer to sell or the solicitation of any offer to buy any securities.  The securities have not been registered under the Securities Act, or any state securities laws, and unless so registered may not be offered or sold in the United States, except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws.</P>



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<I><FONT SIZE=5><P ALIGN="CENTER">Signature</I></FONT><FONT FACE="Times,Times New Roman"> </P>
<P ALIGN="CENTER">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 thereunto duly authorized.</P>

<P ALIGN="CENTER">&nbsp;</FONT><FONT SIZE=5>LabOne, Inc.</P>
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      <P>Date:&nbsp;&nbsp;July 8, 2004</P></TD>
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      <P>By <U>/s/ <I>John W. McCarty</I></U><BR>John W. McCarty
      <BR>Executive V.P. and Chief Financial Officer
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LabOne, Inc. Form 8-K dated July 8, 2004
UNITED STATES 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
Date of Report:
July 8, 2004
Commission file number: 0-16946
LabOne, Inc.
10101 Renner Blvd.
Lenexa, Kansas 66219
(913) 888-1770
Incorporated in Missouri
I.R.S. Employer Identification Number: 43-1039532
Item 9.  Regulation FD Disclosure
LabOne Announces Exercise of Option to Purchase Additional Convertible Senior Debentures
LabOne, Inc. (Nasdaq: LABS), announced today that the initial purchasers exercised their option to purchase an additional $13.5 million principal amount of the Company's 3.50% convertible senior debentures due 2034.  The Company used approximately $87 million of the initial proceeds of the offering to reduce borrowings under its credit facility.  The additional proceeds of approximately $13 million will be used by the Company to pay the remaining borrowings under its credit facility and for general corporate purposes.
This report on Form 8-K does not constitute an offer to sell or the solicitation of any offer to buy any securities.  The securities have not been registered under the Securities Act, or any state securities laws, and unless so registered may not be offered or sold in the United States, except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws.
Signature
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 thereunto duly authorized.
LabOne, Inc.
Date:  July 8, 2004
By
/s/
John W. McCarty
John W. McCarty
Executive V.P. and Chief Financial Officer