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

                                 SCHEDULE 14A
                                (Rule 14a-101)

                    INFORMATION REQUIRED IN PROXY STATEMENT

                           SCHEDULE 14A INFORMATION

          Proxy Statement Pursuant to Section 14(a) of the Securities
                     Exchange Act of 1934 (Amendment No. )

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          Rule 14a-6(e)(2))
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     |X|  Soliciting Material Under Rule 14a-12

                               THERASENSE, INC.
               (Name of Registrant as Specified in its Charter)

                              ABBOTT LABORATORIES
   (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

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______________________________________________________________________________
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         The following is the text of a joint press release issued by Abbott
Laboratories and TheraSense, Inc. on January 13, 2004:

                                                          For Immediate Release
                                                          Abbott
                                                          Media
                                                          Rhonda Luniak
                                                          (847) 938-8408

                                                          Don Braakman
                                                          (847) 937-1237

                                                          Financial Community
                                                          Christy Wistar
                                                          (847) 938-4475

                                                          John Thomas
                                                          (847) 938-2655

                                                          TheraSense
                                                          Maureen Tiongco
                                                          510-749-5400




ABBOTT LABORATORIES TO ACQUIRE THERASENSE
-----------------------------------------

     - Acquisition Strengthens Abbott's Presence in the Large and Growing
          Blood Glucose Monitoring Market with Advanced Technology -

         ABBOTT PARK, Ill., and ALAMEDA, Calif., Jan. 13, 2004 - Abbott
Laboratories (NYSE: ABT) and TheraSense, Inc. (Nasdaq: THER) today announced
that the companies have entered into an agreement for Abbott to acquire all of
the capital stock of TheraSense for $27 per share in cash. TheraSense, based
in Alameda, Calif., develops, manufactures and markets FreeStyle(R)blood
glucose self-monitoring systems, and is a leader in developing systems that
feature a very small sample size, rapid test results and less painful testing.

         "Together with TheraSense, Abbott can build on its success in the
blood glucose monitoring business. We will continue to promote both the
MediSense and TheraSense products and brands. This transaction will allow us
to better serve the needs of people with diabetes through advanced technology,
a promising pipeline, a broader product line, and critical mass in research,
development, sales and marketing," said Ed Fiorentino, president, MediSense
Products, Abbott Laboratories. "In addition, we will provide TheraSense
products with a greater international presence and infrastructure through the
global reach of our existing MediSense business."

         Under the terms of the agreement, Abbott will acquire all of the
outstanding stock of TheraSense for $1.2 billion, net of cash currently held
by TheraSense. Excluding one-time charges, the acquisition will result in an
approximately one-cent reduction in earnings per share in 2004, and is
expected to be accretive thereafter. The transaction is expected to result in
one-time charges in the second quarter, primarily for in-process research and
development, and throughout 2004 for integration expenses. The transaction is
subject to: approval by holders of a majority of TheraSense common stock at a
special meeting of stockholders; regulatory approvals; and customary closing
conditions. Closing is expected during the second quarter of 2004.

         "Abbott is the ideal fit for TheraSense. They share our mission of
improving the lives of people with diabetes," said W. Mark Lortz, chairman,
president and chief executive officer, TheraSense. "The combination will
create significant opportunities in research and development as we progress
toward helping people with diabetes through advancements in continuous blood
glucose monitoring and future integrated systems."

         Abbott entered the blood glucose monitoring field with the
acquisition of MediSense in 1996. MediSense was the first company to
commercialize biosensor technology and grew rapidly with its product,
Precision QID(R). Today, MediSense continues to offer additional innovative
products such as Precision Xtra(TM), the first blood glucose monitor to offer
ketone testing, and Precision PCx(TM), a hand-held, point-of-care blood
glucose monitoring system used in the hospital setting. Each day, Abbott
MediSense Products help more than 2.5 million people manage diabetes around
the world.

         TheraSense's entry into the field of diabetes testing began in
mid-2000 with the launch of its FreeStyle(R) blood glucose monitoring system.
The company's FreeStyle(R) system has a very small sample size requirement
(0.3 microliter), which is 50-90 percent less than most conventional testing
systems. This permits finger testing or less painful alternate site testing on
the forearm, upper arm, thigh, calf and base of the hand. In October 2003,
TheraSense launched its FreeStyle Flash(TM) blood glucose monitoring system.
FreeStyle Flash(TM) combines the world's smallest glucose meter with a very
small sample size, a fast test time of about seven seconds, a backlit panel
display, a lighted test strip port for easy testing at night or in other low
light conditions, and four customizable daily alarms.

         TheraSense recently submitted a Premarket Approval application (PMA)
with the U.S. Food and Drug Administration (FDA) for its FreeStyle
Navigator(TM) Continuous Blood Glucose Monitor. FreeStyle Navigator(TM) is
designed to provide real time glucose data, hypo- and hyperglycemic alarms and
trend analysis. FreeStyle Navigator(TM) utilizes TheraSense's patented Wired
Enzyme(TM) technology and is designed to measure glucose levels in the
patient's interstitial fluid every 60 seconds and transmit the results to a
wireless pager-sized receiver that may be worn on a belt or carried in a
pocket or purse.

         The CozMore(TM) Insulin Technology System is being developed by
TheraSense in conjunction with Deltec, Inc., a leading provider of infusion
systems. This product is scheduled to be launched in the second quarter of
2004 by Deltec. This system helps people with diabetes take charge of their
daily diabetes management by combining the TheraSense blood glucose testing
system and insulin delivery options in a small system that is designed to be
easy to use.

         The World Health Organization estimates that there are 185 million
people with diabetes worldwide with only 40 percent diagnosed and treated.
This number is expected to grow to 500 million by 2025 due to aging
populations, sedentary lifestyles and increasing obesity. The blood glucose
monitoring market is expected to have reached more than $5 billion in sales in
2003, and is projected to grow approximately 10 percent compounded annually.

About TheraSense
         TheraSense develops, manufactures and sells easy to use glucose
monitoring systems designed to reduce the pain of testing for people with
diabetes. The company began selling its first product, the FreeStyle(R) blood
glucose monitoring system, in June 2000. The FreeStyle system has wide
distribution in the United States through national retailers including
Walgreens, Wal-Mart, CVS, Eckerd and Rite Aid. The TheraSense headquarters and
test strip manufacturing facility are located in Alameda, Calif. Additional
information about TheraSense is available at www.therasense.com.

About MediSense Products
         Abbott Laboratories, MediSense Products, located in Bedford, Mass.,
is a leader in the development of products designed to help patients and
caregivers better manage diabetes. The company designs, develops and
manufactures several glucose monitoring systems and test strips for use in
both home and hospital settings. Among its leading brands are Precision
Xtra(TM)/Optium(TM), Precision PCx(TM) and Precision QID(R). Abbott
Laboratories, MediSense Products also produces Precision Link(R), a personal
diabetes data management system, and distributes Precision Sure-Dose(TM)
Insulin Syringes. Additional information about MediSense Products is available
at www.medisense.com.

About Abbott Laboratories
         Abbott Laboratories is a global, diversified health care company
devoted to the discovery, development, manufacture and marketing of
pharmaceuticals, nutritionals, and medical products, including devices and
diagnostics. The company employs more than 70,000 people and markets its
products in more than 130 countries. In 2002, the company's sales were $17.7
billion.
         Abbott's news releases and other information are available on the
company's Web site at www.abbott.com.

              Private Securities Litigation Reform Act of 1995 -
                A Caution Concerning Forward-Looking Statements

Some statements in this news release may be forward-looking statements for
purposes of the Private Securities Litigation Reform Act of 1995. Abbott and
TheraSense caution that these forward-looking statements are subject to risks
and uncertainties that may cause actual results to differ materially from
those indicated in the forward-looking statements including that the
conditions precedent to the completion of the acquisition may not be satisfied
or necessary regulatory approval will not be obtained. Economic, competitive,
governmental, technological and other factors that may affect Abbott's
operations are discussed in Exhibit 99.1 of its Securities and Exchange
Commission Form 10-Q for the period ended Sept. 30, 2003, and are incorporated
by reference. For a description of factors that may affect TheraSense's future
results, see discussion under "Risk Factors Affecting Operations and Future
Results" in TheraSense's Form 10-Q for the quarter ended Sept. 30, 2003, and
periodic reports filed with the Securities and Exchange Commission. Abbott and
TheraSense undertake no obligation to release publicly any revisions to
forward-looking statements as the result of subsequent events or developments.

                       Participants in the Solicitation

In connection with the proposed merger, TheraSense will file a proxy statement
and other relevant documents with the Securities and Exchange Commission
(SEC). INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT
WHEN IT BECOMES AVAILABLE AS IT WILL CONTAIN IMPORTANT INFORMATION ABOUT THE
MERGER AND RELATED MATTERS. INVESTORS AND SECURITY HOLDERS WILL HAVE ACCESS TO
FREE COPIES OF THE PROXY STATEMENT (WHEN AVAILABLE) AND OTHER DOCUMENTS FILED
WITH THE SEC BY THERASENSE AND ABBOTT THROUGH THE SEC WEB SITE AT WWW.SEC.GOV.
THE PROXY STATEMENT AND RELATED MATERIALS MAY ALSO BE OBTAINED FOR FREE (WHEN
AVAILABLE) FROM THERASENSE BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
THERASENSE, INC., 1360 SOUTH LOOP ROAD, ALAMEDA, CA 94502; PHONE (510)
749-5400. DOCUMENTS FILED WITH THE SEC BY ABBOTT MAY ALSO BE OBTAINED FOR FREE
(WHEN AVAILABLE) FROM ABBOTT BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
ABBOTT LABORATORIES, 100 ABBOTT PARK, ROAD, ABBOTT PARK, IL 60064; PHONE (847)
937-7300.

TheraSense, Abbott and their respective directors, executive officers, certain
members of management and employees, may be deemed to be participants in the
solicitation of proxies in connection with the proposed merger. Information
regarding the persons who may, under the rules of the SEC, be considered to be
participants in the solicitation of TheraSense's stockholders and their
interests in the solicitation will be set forth in the proxy statement when it
is filed with the SEC.

                                     # # #

         The following three documents were attached to an email sent to the
employees of TheraSense, Inc. on January 13, 2004:

January 13, 2004

To our future colleagues at TheraSense:

On behalf of all of the employees of Abbott Laboratories around the world, we
are very pleased to welcome you to our company. We are excited about the
potential that this opportunity brings to the employees of both Abbott and
TheraSense, and we would like to provide you with some additional information
about our company and explain what this development will mean for all of us.

We want to assure you that the combination of TheraSense with Abbott's
MediSense Products is a positive move for both companies--and for the people
with diabetes that we serve. Our goal is to make the transition happen as
swiftly and smoothly as possible so we can focus on what's most important:
bringing superior health care products and technologies to the people who need
them.

Abbott Laboratories is a global, broad-based health care company devoted to
the discovery, development, manufacture and marketing of pharmaceuticals and
medical products, including devices and diagnostics. We market our products in
more than 130 countries. Upon closing of the deal, you will be joining
Abbott's diabetes care business, which will consist of MediSense and
TheraSense operations. The new organization will be led by Ed Fiorentino, the
current President of MediSense.

We look forward to the opportunity to meet with many of you. In fact, Ed
Fiorentino will be at TheraSense to meet with you during the week of January
19. We invite you also to visit our Web site, www.abbott.com, to learn more
about us. Throughout the transition, we will be providing ongoing
communications about Abbott. However, you should know that it is our intention
to maintain and invest in the Alameda site.

We realize that you are likely to have many questions about the transition. We
are currently evaluating how our organizations will best fit together, and
anticipate that much of the structure will be determined in the next few
months. We'll continue to communicate our progress. Abbott needs talented
people to help drive our business, and we will be looking to you to help drive
that growth.

We are confident that, with our combined efforts, we will continue to make
tremendous progress in our goal to better serve the needs of people with
diabetes.

Best Regards,

Richard A. Gonzalez                                  Edward J. Fiorentino
President and Chief Operating Officer,               President, MediSense
Medical Products


In connection with the proposed merger, TheraSense will file a proxy statement
and other relevant documents with the Securities and Exchange Commission
(SEC). INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT
WHEN IT BECOMES AVAILABLE AS IT WILL CONTAIN IMPORTANT INFORMATION ABOUT THE
MERGER AND RELATED MATTERS. INVESTORS AND SECURITY HOLDERS WILL HAVE ACCESS TO
FREE COPIES OF THE PROXY STATEMENT (WHEN AVAILABLE) AND OTHER DOCUMENTS FILED
WITH THE SEC BY THERASENSE AND ABBOTT THROUGH THE SEC WEB SITE AT WWW.SEC.GOV.
THE PROXY STATEMENT AND RELATED MATERIALS MAY ALSO BE OBTAINED FOR FREE (WHEN
AVAILABLE) FROM THERASENSE BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
THERASENSE, INC., 1360 SOUTH LOOP ROAD, ALAMEDA, CA 94502; PHONE (510)
749-5400. DOCUMENTS FILED WITH THE SEC BY ABBOTT MAY ALSO BE OBTAINED FOR FREE
(WHEN AVAILABLE) FROM ABBOTT BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
ABBOTT LABORATORIES, 100 ABBOTT PARK, ROAD, ABBOTT PARK, IL 60064; PHONE (847)
937-7300.

TheraSense, Abbott and their respective directors, executive officers, certain
members of management and employees, may be deemed to be participants in the
solicitation of proxies in connection with the proposed merger. Information
regarding the persons who may, under the rules of the SEC, be considered to be
participants in the solicitation of TheraSense's stockholders and their
interests in the solicitation will be set forth in the proxy statement when it
is filed with the SEC.

                                     # # #

                               ABBOTT FACT SHEET

Abbott Overview
         Founded more than 100 years ago by Chicago physician Dr. Wallace C.
Abbott, Abbott Laboratories has emerged as one of the world's top health care
companies. Today, Abbott discovers, develops, manufactures, and markets
products and services that span the continuum of care - from prevention and
diagnosis, to treatment and cure. Abbott casts a keen focus on areas with the
greatest unmet medical need, such as oncology, infectious diseases, diabetes,
obesity, immunology, and cardiovascular disease.

         With industry-leading internal research capabilities, Abbott combines
science and innovation to develop breakthrough medical technologies that
advance patient care through leading pharmaceuticals and medical products,
including diagnostics, medical devices and nutritionals. About 40 percent of
sales are outside of the United States and more than 70,000 employees in 130
countries around the world support Abbott's vision to be the world's premier
health care company, and to bring maximum benefit to patients.

ABBOTT AT A GLANCE
-------------------------------------------------------------------------------

Worldwide headquarters:                     Abbott Park, Ill.
Web address:                                www.abbott.com
Primary business:                           Pharmaceutical Products group,
                                            Medical Products group, including
                                            diagnostics, devices and
                                            nutritionals
Employees:                                  70,000
Facilities:                                 135 worldwide
Manufacturing sites:                        60
Countries where products sold:              130
Chairman and CEO:                           Miles D. White (since 1999)
2002 annual sales:                          $17.7 billion

VISION AND CENTRAL PURPOSE
-------------------------------------------------------------------------------

                                    Vision
Abbott's vision is to be the world's premier health care company by being the
best health care supplier, employer, business partner, investment and
neighbor.

                                Central Purpose
To develop breakthrough health care products that advance patient care for
diseases with the greatest unmet medical need.

FINANCIAL PROFILE
-------------------------------------------------------------------------------
     o   Since becoming a public company in 1929, Abbott's financial
         performance has ranked among the best in the world.

     o   Abbott's 2002 sales and net earnings were $17.7 billion and $3.2
         billion, respectively, with diluted earnings per share of $2.06,
         excluding one-time charges.

     o   Abbott's market value - the total value of its issued stock - places
         it among the top 50 companies in the United States, and the top 100
         companies in the world. Many investors value Abbott more than many
         larger companies with much higher sales because of its consistent
         growth and stable earnings. For instance:

            o     In December 2003, Abbott recorded its 320th consecutive
                  quarterly dividend to be paid to shareholders since 1924.

            o     For the 10-year period ending Dec. 31, 2002, Abbott (215
                  percent) outperformed the S&P 500 Index (142 percent) in
                  price appreciation and dividends.

            o     As chronicled in From Good to Great: Why Some Companies Make
                  the Leap ... and Others Don't, author Jim Collins notes that
                  "...from its transition date in 1974 to 2000, [Abbott]
                  created shareholder returns that beat the market 4.5 to 1."

     o   The company's financial performance consistently places it high in
         the rankings of major business publications, including FORTUNE
         magazine's list of the 500 largest U.S.-based corporations and the
         Forbes list of Super 100 companies, based on sales, profits, assets
         and market value. Abbott also is listed in the Barron's 500, and was
         ranked 21st in FORTUNE magazine's "America's Best Wealth Creators."

     o   A broad and deep pipeline of new products plus strategic
         acquisitions, alliances, and product licensing add significantly to
         Abbott's financial strength.

RECENT AWARDS AND HONORS
-------------------------------------------------------------------------------

     o   Named as one of "America's Most Admired Companies" every year since
         1984 by FORTUNE magazine.

     o   Repeatedly honored by FORTUNE magazine as one of the best companies
         in the country for its diversity practices and initiatives, including
         six straight years since the publication began its "50 Best Companies
         For Asians, Blacks and Hispanics" rankings.

     o   Named for the second consecutive year in 2003 by Working Mother
         magazine as one of the 10 best employers and for the third year named
         on the magazine's prestigious annual list of "100 Best Companies for
         Working Mothers."

     o   Selected as one of "10 Best Companies for Women" by Health magazine
         in 2002, Abbott is both the only health care company on the list and
         the only company headquartered in Illinois. Those on the list are
         recognized for excelling in helping women balance their work and
         personal lives.

     o   Listed by Money magazine as one of the top 30 stocks.

     o   Ranked by Money magazine in 2002 as having the third best benefits
         package in the country.

     o   Ranked in the Business Week 50: "The Best Performers."

     o   Listed #27 in the 500 Employers of Choice (for 2001) by USA Today
         Employment Review.

     o   Lauded as one of the top five companies to work for in Chicago by
         Chicago Magazine.

     o   Received the 2001 Governor's Family Investment Award in recognition
         of its innovative work/life programs and family-friendly benefits.

     o   Received the 2002 Corporate Friend of Children Award from the Child
         Welfare League of America, in recognition of Abbott's ongoing support
         of children and families. Specifically, Abbott was recognized for its
         innovative efforts to form partnerships with government and other
         public entities to improve the quality of child care across the
         country.

     o   Ranked #13 in Black Collegian magazine's Top 50 Diversity Employers
         Survey in 2002 - and first among all pharmaceutical companies.

     o   Ranked in Minority MBA magazine's list of the "Top Companies for
         Minority MBAs."

     o   Named to Next Step's Diversity 100: America's Most Diverse
         Corporations by Next Step magazine in 2001.

     o   Listed by BestJobsUSA as one of the best employers in the country.

     o   Received five-star ratings in all internship program categories
         (selectivity, compensation, and quality of life) by Princeton
         Review's America's Top Internships.

ABBOTT HISTORY
-------------------------------------------------------------------------------

1888              Dr. Wallace C. Abbott, M.D., begins producing dosimetric
                  granules in his apartment on Chicago's North Side. He is a
                  pioneer in the new science of pharmaceutical medicine.

1900              The business is officially incorporated in Illinois as the
                  Abbott Alkaloidal Company.

1915              The company changes its name to Abbott Laboratories.

1920              Dr. Abbott breaks ground for a new manufacturing facility in
                  North Chicago, Ill. This facility will serve as the
                  company's world headquarters for more than 40 years, and
                  remains the company's primary manufacturing location today.

1921              Dr. Abbott dies at the age of 63. In the 33 years since he
                  started his company, he had helped to significantly improve
                  pharmaceutical science, modernize the production of
                  medications, and educate physicians on critical changes in
                  medical practice.

1929              Abbott stock is listed on the Chicago Stock Exchange. The
                  offering is $20,000 shares at $32 each.

1931              Abbott establishes its first international affiliate in
                  Montreal, Canada. The company's international presence will
                  grow steadily.

1936              Abbott introduces the anesthetic agent Pentothal, developed
                  by Abbott scientists, Dr. Ernest Volwiler and Dr. Donalee
                  Tabern. For this discovery, they are named to the U.S.
                  Inventors Hall of Fame in 1986.

1941              Abbott is one of the five pioneers in the United States to
                  start commercial production of penicillin - the "Wonder
                  Drug" that was the first practical antibiotic. Penicillin's
                  impact was immediate: during World War I, the death rate
                  from pneumonia in the U.S. Army was 18 percent; in World War
                  II, it fell to less than 1 percent.

1952              Erythromycin, a new antibiotic with good activity against
                  gram-positive bacteria, is introduced.

1962              Abbott enters a joint venture with Dainippon Pharmaceutical
                  Co., Ltd., of Osaka, Japan, to manufacture
                  radiopharmaceuticals. Major plant expansions are completed
                  in England, Italy and France.

1964              The company merges with M&R Dietetic Laboratories, of
                  Columbus, Ohio, best known as the makers of Similac(R)infant
                  formula. M&R eventually becomes Abbott's Ross Products
                  Division.

1965              Abbott moves major operations to Abbott Park, a 420-acre
                  site southwest of its North Chicago headquarters.

1973              Abbott forms its Diagnostics Division to bring together all
                  diagnostic products and services. The company also
                  introduces Ensure(R), the first adult medical nutritional.

1977              TAP Pharmaceuticals Inc., now known as TAP Pharmaceutical
                  Products Inc., is formed as a joint venture between Abbott
                  and Takeda Chemical Industries, Ltd.

1980              Abbott acquires Sorenson Research of Salt Lake City, Utah, a
                  leading maker of innovative medical disposables.

1983              In Japan, Abbott merges three facilities into one unified
                  health care company called Dainabot, K.K.

1985              Abbott wins U.S. approval to market the world's first
                  diagnostic test for AIDS. TAP receives approval for
                  Lupron(R), a new therapy for prostate cancer, and
                  ADD-Vantage(R), a unique IV drug-delivery system, is
                  launched.

1987              Hytrin(R), a new cardiovascular drug for treatment of
                  hypertension, receives U.S. FDA approval.

1988              Abbott celebrates its centennial. The IMx immunoassay
                  system, which allows high and low molecular weight analytes
                  to be used in testing for fertility, rubella, congenital
                  disease, cancer, hepatitis, and endocrine function goes on
                  to become one of the best-selling products in Abbott's
                  history.

1990              Clarithromycin, an important new macrolide antibiotic, is
                  introduced.

1991              Several major products are introduced worldwide, including
                  Survanta(R), for treatment of neonatal respiratory distress
                  syndrome. Abbott enters the hematology testing market with
                  the acquisition of Sequoia-Turner Corp.

1993              Hytrin receives U.S. FDA clearance for use in treating
                  symptoms of benign prostatic hyperplasia (BPH), a condition
                  of the prostate. Abbott launches AxSym(R), a new,
                  labor-saving diagnostic system.

1994              Abbott introduces Sevoflurane(R), the first truly universal
                  anesthetic, and completes to cross-license LCR and PCR, two
                  gene amplification technologies.

1995              Joint venture TAP Pharmaceutical Products Inc. receives
                  approval for Prevacid(R), a proton pump inhibitor used in
                  treating ulcers. Abbott's diagnostic division introduces
                  Abbott Prism(R), the first fully automated, high-volume
                  blood analyzer.

1996              The company receives U.S. FDA clearance for Norvir, one of
                  the first protease inhibitors for treatment of HIV and AIDS,
                  changing the treatment of the disease. The company enters
                  the blood glucose monitoring market with its acquisition of
                  MediSense, Inc. Similac(R)Advance is launched in several
                  international markets.

1997              Abbott acquires the parenteral products business, which
                  helped the hospital products area expand the company's
                  drug-delivery business, and provided Abbott with worldwide
                  rights to pre-filled, single-dose syringe technology with
                  Sanofi Pharmaceuticals proprietary drug-delivery system. The
                  company also launches several new products, including an
                  improved Similac infant formula in the United States that
                  includes nucleotides at a patented level and ratio patterned
                  after the potentially available nucleotides in breast milk.

1998              Abbott launches Glucerna(R) shakes and snack bars, specially
                  formulated nutritionals for people with diabetes.
                  Depakote(R) surpasses lithium as the most-prescribed drug
                  for treating mania.

1999              Abbott launches Architect(R), a next-generation diagnostic
                  system, and acquires Perclose, Inc., strengthening its
                  presence in the vascular market.

2000              Abbott receives U.S. FDA approval for five new drugs,
                  including Kaletra(R), an advanced-generation protease
                  inhibitor for the treatment of HIV/AIDS, Biaxin(R)XL, a
                  once-daily version of its flagship antibiotic and
                  Depakote(R)ER, for migraine prevention.

2001              Abbott completes the acquisition of the pharmaceutical
                  business of BASF AG, including the global operations of
                  Knoll Pharmaceuticals. In addition, Abbott acquires Vysis,
                  Inc., a leading genomic disease management company.

2002              Abbott receives U.S. FDA approval for Humira(R), previously
                  know as D2E7, for the treatment of rheumatoid arthritis
                  (RA). Abbott acquires the cardiovascular stent business of
                  Biocompatibles International plc., and enters an alliance
                  with Medtronic, Inc. to market stent delivery systems.
                  Abbott and Celera Diagnostics form a strategic alliance to
                  develop, manufacture and market a broad range of molecular
                  diagnostic products for disease detection, monitoring and
                  therapy selection. Abbott also formed a strategic alliance
                  with Millenium Pharmaceuticals for the joint discovery,
                  development and commercialization of a full spectrum of both
                  drugs and molecular diagnostics for the treatment and
                  management of obesity and diabetes. This alliance links
                  complementary competencies by pairing Millennium's genomics
                  platform and target discovery effort with Abbott's drug
                  development, manufacturing, commercialization and diagnostic
                  expertise. Internationally, the company continues to grow
                  and now has locations in 140 countries.

2003              The European Union grants marketing authorization for
                  Humira, for the treatment of rheumatoid arthritis (RA).
                  Abbott acquires i-STAT, a leader in point of care
                  diagnostics; ZonePerfect(R), a line of nutritional products;
                  Spinal Concepts, a maker of devices for spinal disorders,
                  diseases and injuries; and the coronary and peripheral
                  product line of JOMED. In addition, Abbott announced plans
                  to spin off its core hospital products business. Abbott
                  introduced the Cell-Dyn 1800 hematology analyzer.

                                     # # #

                             MEDISENSE FACT SHEET

MediSense Overview
Abbott Laboratories, MediSense Products was established in 1996 through the
acquisition of MediSense Inc. MediSense(R) was first formed as Genetics
International by James McCann, Bernie Triedl and Ronald Zwanziger in 1981
while at Harvard Business School. It was created as a vehicle for developing
new and promising technologies.

Later that year the company licensed biosensor technology from Oxford
University. Further developed at Cranfield University, the technology was
patented worldwide in 1984. In the same year, an R&D and manufacturing
facility was opened in Abingdon, located in the United Kingdom, and exclusive
distribution rights were awarded to Baxter Travenol.

By 1988, Genetics International had been renamed MediSense Inc. As the
company's success grew, so did its portfolio of products. MediSense(R) was the
first company to commercialize biosensor technology. In 1994, MediSense Inc.
went public in the United States with an initial public offering of 4.5
million shares at $12 per share. Following a number of industry triumphs
between 1989 and 1996, Abbott Laboratories acquired the company, combining the
resources and strengths of the two organizations.

Today, Abbott Laboratories, MediSense Products is a leader in the development
of innovative products to meet the needs of people living with diabetes.
MediSense(R) is based in Bedford, Massachusetts, with two additional
manufacturing facilities in Abingdon and Witney in the United Kingdom, and the
company also operates multiple sales offices around the globe.

The MediSense line of home blood glucose monitoring systems gives individuals
living with diabetes accurate and convenient testing options. In addition,
MediSense supplies hospitals and medical professionals with advanced meter
systems that allow for superior monitoring results for managing testing needs.
MediSense's state-of-the-art portfolio of products provides a variety of blood
glucose monitors for use in both home and hospital settings.

MediSense History

1981     Creation of Genetics International with offices in Cambridge,
         Massachusetts. Invention of first biosensor for glucose detection
         (Oxford University).

1982     Technology patented worldwide.
         Baxter obtains exclusive distribution rights.
         Opened strip R&D plant in Abingdon, U.K.

1986     ExacTech(R)Pen, the world's first commercial glucose biosensor,
         approved in the U.S.

1987     ExacTech Pen launched in Europe.

1988     Genetic International changes name to MediSense, Inc.

1989     Launch of ExacTech Card, a credit card-sized monitor with enlarged
         display.

1990     Launch of MediSense Card and MediSense Pen, the first personal
         glucose system with blood detection capability for auto start and the
         first biosensors with third electrode that detects blood
         interferents.

1991     Satellite G, the first dedicated hospital glucose system with
         individual bar-coded strips, is launched.

1994     Launch of Precision Link(TM), a PC based product to display
         historical and trending information on glucose results to both home
         and professional users.

1995     Launch of ExacTech RSG, the first no calibration personal glucose
         meter. Launch of Precision QID(R)monitor and strip that allow the
         user to hold the meter during the test.

1996     Abbott Laboratories acquires MediSense, Inc.

1997     Launch of upgraded strip technology that requires lower blood volume.

1998     Precision(TM)Plus Electrodes, Precision(TM)PCx(TM)and QC Manager are
         launched. Precision PCx is a hospital product designed for
         point-of-care testing, with data management and scanned barcode
         capabilities. QC Manager is a comprehensive hospital data management
         system used with PCx to meet the needs of both patient results and
         regulatory data storage and record keeping.

1999     Opened new, state-of-the-art manufacturing plant in Witney, U.K., to
         expand manufacturing capabilities.

2000     Precision Xtra(TM)Launch: This monitor was designed with features
         that make it easier to use, including date and time recording, data
         storage for 450 tests, a larger display, replaceable batteries, and
         multiple language capability. It is also the first personal blood
         glucose monitor to offer ketone testing capability.

2001     Sof-Tact(TM)/Soft-Sense, the first integrated alternate-site glucose
         monitoring system to provide virtually painless, one-step testing is
         launched in the U.S. and abroad.

         Worldwide launch of TrueMeasure(TM) Technology, our proprietary strip
         design that includes a dedicated fill trigger electrode to ensure
         sufficient blood sample; end/top-fill application for improved ease
         of use, and proprietary chemistry that screens out interfering
         agents, such as vitamin C and acetaminophen.

2003     Precision PCx 2.2.1(TM) system, an enhanced version of a hand-held,
         point-of-care blood glucose testing system, is launched. The new
         system and test strip were developed based on feedback from diabetes
         caregivers in the hospital setting. Precision PCx 2.2.1 offers
         several advantages in the areas of test strip performance, sample
         application, error reduction, ease-of-use and data management.

In connection with the proposed merger, TheraSense will file a proxy statement
and other relevant documents with the Securities and Exchange Commission
(SEC). INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT
WHEN IT BECOMES AVAILABLE AS IT WILL CONTAIN IMPORTANT INFORMATION ABOUT THE
MERGER AND RELATED MATTERS. INVESTORS AND SECURITY HOLDERS WILL HAVE ACCESS TO
FREE COPIES OF THE PROXY STATEMENT (WHEN AVAILABLE) AND OTHER DOCUMENTS FILED
WITH THE SEC BY THERASENSE AND ABBOTT THROUGH THE SEC WEB SITE AT WWW.SEC.GOV.
THE PROXY STATEMENT AND RELATED MATERIALS MAY ALSO BE OBTAINED FOR FREE (WHEN
AVAILABLE) FROM THERASENSE BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
THERASENSE, INC., 1360 SOUTH LOOP ROAD, ALAMEDA, CA 94502; PHONE (510)
749-5400. DOCUMENTS FILED WITH THE SEC BY ABBOTT MAY ALSO BE OBTAINED FOR FREE
(WHEN AVAILABLE) FROM ABBOTT BY DIRECTING A REQUEST TO: INVESTOR RELATIONS,
ABBOTT LABORATORIES, 100 ABBOTT PARK, ROAD, ABBOTT PARK, IL 60064; PHONE (847)
937-7300.

TheraSense, Abbott and their respective directors, executive officers, certain
members of management and employees, may be deemed to be participants in the
solicitation of proxies in connection with the proposed merger. Information
regarding the persons who may, under the rules of the SEC, be considered to be
participants in the solicitation of TheraSense's stockholders and their
interests in the solicitation will be set forth in the proxy statement when it
is filed with the SEC.