SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549
                              __________________________

                                   SCHEDULE 14D-1/A
                              __________________________

                     TENDER OFFER STATEMENT PURSUANT TO SECTION
                   14(D)(1) OF THE SECURITIES EXCHANGE ACT OF 1934
                              _________________________

                                   MEDISENSE, INC.
                              (NAME OF SUBJECT COMPANY)

                                AAC ACQUISITION, INC.,
                             a wholly owned subsidiary of
                                 ABBOTT LABORATORIES
                                      (BIDDERS)

                                   Common Stock and
                                 Class B Common Stock
                            (TITLE OF CLASS OF SECURITIES)

                                      584960108
                        (CUSIP NUMBER OF CLASS OF SECURITIES)

                                   Jose M. de Lasa
                           Senior Vice President, Secretary
                                 and General Counsel
                                 Abbott Laboratories
                                 100 Abbott Park Road
                          Abbott Park, Illinois  60064-3500
                                    (847) 937-6100
                    (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON
                 AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS ON
                                  BEHALF OF BIDDER)

                                       Copy to:
                                   Robert A. Helman
                                 Mayer, Brown & Platt
                               190 South LaSalle Street
                                  Chicago, IL  60603
                                    (312) 782-0600



    This Amendment No. 1 amends and supplements the Tender Offer Statement on
Schedule 14D-1 dated April 4, 1996 (the "Schedule 14D-1") of Abbott
Laboratories, an Illinois corporation ("Parent") and AAC Acquisition, Inc., a
Massachusetts corporation and wholly-owned subsidiary of Parent (the
"Purchaser"), filed in connection with the Purchaser's offer to purchase any and
all shares of the common stock, $.01 par value per share (the "Common Stock")
and Class B common stock, $.01 par value per share (the "Class B Common Stock"
and together with the Common Stock, the "Shares") of MediSense, Inc., a
Massachusetts corporation (the "Company") upon the terms and subject to the
conditions set forth in the Schedule 14D-1.  Capitalized terms used but not
otherwise defined herein shall have the meanings assigned to those terms in the
Schedule 14D-1.


ITEM 10.   ADDITIONAL INFORMATION.

    On April 11, 1996, Parent issued the press release attached hereto as
Exhibit (a)(10).  The full text of the press release is incorporated herein by
reference.

ITEM 11. MATERIAL TO BE FILED AS EXHIBITS

    (a)(10)   Press Release dated April 11, 1996.



                                      SIGNATURE

    After due 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.



Dated:  April 16, 1996


                                       AAC ACQUISITION, INC.

                                          /s/ Gary P. Coughlan
                                      ---------------------------------------
                                       Name:  Gary P. Coughlan
                                       Title:  Vice President and Treasurer


                                       ABBOTT LABORATORIES

                                          /s/ Gary P. Coughlan
                                       --------------------------------------
                                       Name:  Gary P. Coughlan
                                       Title:  Senior Vice President, Finance
                                                and Chief Financial Officer




                                                 FOR IMMEDIATE RELEASE


                                                 Media:
                                                 Rick Moser, Abbott
                                                 (847) 938-8943

                                                 Financial Community:
                                                 Patricia Bergeron, Abbott
                                                 (847) 938-5633


                  ABBOTT LABORATORIES ACQUISITION OF MEDISENSE, INC.
                             RECEIVES ANTITRUST CLEARANCE


    ABBOTT PARK, Ill., April 11, 1996 -- Abbott Laboratories (NYSE: ABT)
announced today that it received early termination of the waiting period under
the Hart-Scott-Rodino Antitrust Improvements Act applicable to Abbott's pending
acquisition of MediSense, Inc.  The termination of the Hart-Scott-Rodino waiting
period satisfies one the principal conditions to the pending acquisition.

    The two companies announced on March 29 that they had signed a definitive
agreement through which Abbott will acquire MediSense, the biosensor technology
leader in blood glucose self-testing systems for people with diabetes.  Abbott
commenced a cash tender offer on April 4, 1996, for all outstanding shares of
MediSense common stock at a price of $45 per share.  The tender offer is
scheduled to expire at midnight, May 1, 1996, subject to customary closing
conditions.

    Following the tender offer, MediSense will be merged with a wholly owned
subsidiary of Abbott Laboratories, and each



remaining MediSense shareholder will receive $45 per share in exchange for each
MediSense share held.

    Abbott Laboratories is a worldwide manufacturer of health care products,
employing 50,000 people.  In 1995, the company's sales and net earnings were
$10.0 billion and $1.7 billion, respectively, with earnings per share of $2.12.

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