FOR IMMEDIATE RELEASE:

February 11, 2000
                                       Contacts: Kurt Gruenbacher, 913-577-1445
                                                  Peter Wilkinson, 913-577-1333

                      LabOne ADOPTS SHAREHOLDER RIGHTS PLAN

LENEXA, KANSAS -- LabOne, Inc. (Nasdaq NMS: LABS) announced today that its board
of directors has adopted a shareholder rights plan. The rights plan replaces and
modernizes a  shareholder  rights plan which was adopted by the  corporation  in
1988 and expired in 1998.

In  conjunction  with the rights  plan,  the board of  directors  has declared a
dividend of one Preferred  Stock  Purchase Right for each  outstanding  share of
Common  Stock.  The  dividend  will  be  distributed  on  February  25,  2000 to
shareholders of record as of the close of business on that date.

The board of directors adopted the rights plan in order to insure, to the extent
possible, that all shareholders receive fair and equal treatment in the event of
a proposed  takeover,  and to protect  the  company  and its  shareholders  from
abusive acquisition tactics and inadequate or coercive takeover bids. The rights
plan was not adopted in response to any specific  effort to acquire the company.
The rights plan is similar to plans adopted by many other companies.

W. Thomas Grant II, chairman,  president and CEO of LabOne stated, "The board of
directors  believes that the  shareholder  rights plan provides an effective and
reasonable  means of  preserving  for the company's  shareholders  the long-term
value of the company in the event of an attempted takeover. The rights plan will
not prevent an appropriate  transaction that the board of directors  believes is
in the best interests of shareholders."

The  distribution  of rights is not taxable to the company or the  shareholders.
Until the rights  become  exercisable,  the rights  will not be  represented  by
separate certificates and will trade with the company's common stock.

Subject to certain  exceptions,  the rights will be exercisable only if a person
or group  acquires  15 percent or more of  outstanding  LabOne  Common  Stock or
announces a tender or  exchange  offer which  would  result in  ownership  of 15
percent or more of the Common  Stock.  The rights plan  provides with respect to
the W.T. Grant family that the rights will be exercisable only if members of the
Grant  family  become the owners of 20  percent  or more of  outstanding  LabOne
Common  Stock,  excluding  ownership of shares or other  securities  acquired by
members of the Grant  family  pursuant to certain  employee or director  benefit
plans  on  or  after  February  11,  2000.  The  Grant  family   currently  owns
approximately 17.4 percent of outstanding shares.






Each right will initially  entitle the holder to purchase one one-hundredth of a
newly  issued  share of Series A  Preferred  Stock of the company at an exercise
price of $50.00, subject to adjustment. If a person or group acquires 15 percent
or more of the  outstanding  stock,  each  holder  of a  right,  other  than the
acquiring  persons,  will no longer have the right to purchase  Preferred Stock,
but will instead have the right to purchase a number of shares of LabOne  Common
Stock at half of the market price of those shares.  In the event of a subsequent
merger or other business combination transaction, each holder of a right will be
entitled to purchase  shares of common stock of the acquiring  entity at half of
the market price of those shares.

The company's  board of directors will be entitled to redeem the rights for $.01
per right at any time prior to a person or group exceeding the ownership  limits
in the rights plan. The rights will expire in 10 years,  unless earlier redeemed
or exchanged by the company.

The company  will file with the  Securities  and  Exchange  Commission a Current
Report on Form 8-K  describing the rights plan. The Form 8-K will include a copy
of the  Rights  Agreement  containing  the full  text of the  rights  plan as an
exhibit.  A  summary  of the  terms of the  rights  plan  will be mailed to each
shareholder  of record of LabOne as of the close of  business  on  February  25,
2000.

About the company

LabOne is a national  laboratory  company with three operating  divisions:  risk
appraisal  testing  and  related  services  for  insurers   (Insurance  Services
Division), healthcare-related testing for managed care organizations, physicians
and insured  members  (Healthcare  Division),  and drug  testing  for  employers
(Substance  Abuse  Testing  Division).  The  company's  web site is  located  at
www.LabOne.com.

Forward-Looking Statements

This  press  release  may  contain  "forward-looking  statements,"  as  well  as
historical   information.   Forward-looking   statements  include   projections,
statements of plans and objectives,  statements of future  economic  performance
and  statements  of  assumptions  underlying  such  statements.  Forward-looking
statements involve known and unknown risks and uncertainties. Many factors could
cause actual  results to differ  materially  from those that may be expressed or
implied in such forward-looking  statements,  including, but not limited to, the
volume and pricing of laboratory  tests  performed by the Company,  competition,
the  extent  of market  acceptance  of the  Company's  testing  services  in the
healthcare and substance abuse testing  industries,  general economic conditions
and other  factors  detailed  from  time to time in the  Company's  reports  and
registration statements filed with the Securities and Exchange Commission.

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