SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                  SCHEDULE l3D

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 1)*

                               i-STAT Corporation

- --------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $.15 per share

- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

- --------------------------------------------------------------------------------
                                    450312103

- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                                     with a copy to:
Stephen Feinberg                                     Robert G. Minion, Esq.
450 Park Avenue                                      Lowenstein Sandler PC
28th Floor                                           65 Livingston Avenue
New York, New York  10022                            Roseland, New Jersey  07068
(212) 421-2600                                       (973) 597-2424
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Persons

                Authorized to Receive Notices and Communications)

                                 March 16, 2000

- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of Sections 240.13d-1(e), 240.13d-1(f) or  240.13d-1(g), check
the following box. |_|

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including all exhibits.  See Section 240.13d-7(b)  for
other parties to whom copies are to be sent.

*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
disclosures provided in a prior cover page.

The information required on 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).





THIS AMENDMENT IS BEING FILED TO CORRECT  CERTAIN  INFORMATION  CONTAINED IN THE
SCHEDULE 13D PREVIOUSLY FILED BY STEPHEN FEINBERG AS OF MARCH 16, 2000.

CUSIP No.     450312103
________________________________________________________________________________
1)   Names of  Reporting  Persons/I.R.S.  Identification  Nos. of Above  Persons
     (entities only):

                                Stephen Feinberg
________________________________________________________________________________
2)   Check the Appropriate Box if a Member of a Group (See Instructions):

         (a)                                Not
         (b)                             Applicable
________________________________________________________________________________
3)   SEC Use Only
________________________________________________________________________________
4)   Source of Funds (See Instructions):  WC
________________________________________________________________________________
5)   Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d)
     or 2(e):
                                 Not Applicable
________________________________________________________________________________
6)   Citizenship or Place of Organization:           United States
________________________________________________________________________________
     Number of                         7) Sole Voting Power:          1,759,702*
                                       -----------------------------------------
     Shares Beneficially               8) Shared Voting Power:
                                       -----------------------------------------
     Owned by

     Each Reporting                    9) Sole Dispositive Power:     1,759,702*
                                       -----------------------------------------
     Person With                       10) Shared Dispositive Power:
                                       -----------------------------------------
________________________________________________________________________________
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:    1,759,702*
________________________________________________________________________________
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares
     (See Instructions):                               Not Applicable
________________________________________________________________________________
13)  Percent of Class Represented by Amount in Row (11):     11.2%*
________________________________________________________________________________
14)  Type of Reporting Person (See Instructions):     IA
________________________________________________________________________________
* Cerberus  Partners,  L.P., a limited  partnership  organized under the laws of
Delaware  ("Cerberus"),  is the  record  holder  1,759,702  shares of the common
stock, par value $.15 per share (the "Common Stock"), of i-STAT Corporation (the
"Company") for its own account and for the benefit of various private investment
funds described  below,  which are managed,  directly or indirectly,  by Stephen
Feinberg.  Of such shares of the Common  Stock,  (i) 254,000  shares are held by
Cerberus,  (ii)  639,127  shares are held by  Cerberus  International,  Ltd.,  a
corporation organized under the laws of the Bahamas ("International"), and (iii)
an  aggregate of 866,575  shares are held by certain  other  private  investment
funds  (collectively,  the "Funds").  Stephen Feinberg possesses sole voting and
investment  authority  over all  securities  of the  Company  held by  Cerberus,
International and the Funds. See Item 5 for further information.





Item 1.   Security and Issuer.

          This statement  relates to the common stock,  par value $.15 per share
(the "Common Stock"),  of i-STAT  Corporation  (the "Company"),  whose principal
executive  offices are located at 104 Windsor  Center Drive,  East Windsor,  New
Jersey 08520.

Item 2.   Identity and Background.

          The person filing this statement is Stephen  Feinberg,  whose business
address is 450 Park Avenue,  28th Floor,  New York, New York 10022. Mr. Feinberg
serves as (i) the managing member of Cerberus  Associates,  L.L.C.,  the general
partner of Cerberus Partners, L.P., a Delaware limited partnership ("Cerberus"),
and (ii) the  investment  manager for each of Cerberus  International,  Ltd.,  a
corporation  organized  under  the laws of the  Bahamas  ("International"),  and
certain other private investment funds  (collectively,  the "Funds").  Cerberus,
International and the Funds (collectively,  the "Feinberg Entities") are engaged
in the investment in personal  property of all kinds,  including but not limited
to capital  stock,  depository  receipts,  investment  companies,  mutual funds,
subscriptions,  warrants, bonds, notes, debentures, options and other securities
of whatever kind and nature.

          Mr. Feinberg has never been convicted in any criminal proceeding,  nor
has he been a party to any  civil  proceeding  commenced  before a  judicial  or
administrative body of competent  jurisdiction as a result of which he was or is
now subject to a judgment, decree or final order enjoining future violations of,
or prohibiting or mandating  activities  subject to, federal or state securities
laws or finding  any  violation  with  respect to such laws.  Mr.  Feinberg is a
citizen of the United States.

Item 3.   Source and Amount of Funds or Other Consideration.

          Pursuant to the terms of a stock purchase agreement by and between the
Cerberus and Agilent Technologies,  Inc., Cerberus purchased 1,738,702 shares of
the Company's  Common Stock on behalf of the Feinberg  Entities for an aggregate
purchase  price of  $28,688,583  in a  transaction  pursuant to Rule 144(k).  In
addition,  the Feinberg Entities purchased 36,000 shares of the Company's Common
Stock for an aggregate purchase price of $525,564, of which 15,000 shares of the
Company's Common Stock were sold by the Feinberg  Entities (as described in Item
5 below).  All funds used to purchase the securities of the Company on behalf of
the Feinberg  Entities came directly from the assets of Cerberus,  International
and the Funds, respectively.

Item 4.   Purpose of Transaction.

          The acquisition of the securities referred to herein is for investment
purposes  on behalf of  Cerberus,  International  and the  Funds,  respectively.
Stephen  Feinberg has no present  plans or  intentions  which relate to or would
result in any of the  transactions  being  required to be described in Item 4 of
Schedule 13D.

Item 5.   Interest in Securities of the Issuer.

          Based upon information set forth in the Company's  Quarterly Report on
Form 10-Q for the quarterly  period ended  September 30, 1999, as of November 5,
1999, 15,711,492 shares of Common Stock were issued and outstanding. As of March
16, 2000, (i) Cerberus is the holder of 254,000 shares of the Common Stock, (ii)
International  is the holder of 639,127 shares of the Common Stock and (iii) the
Funds in the aggregate are the holders of an aggregate of 866,575  shares of the



Common Stock.  Stephen Feinberg  possesses sole voting and investment  authority
over all  securities  of the Company  held by  Cerberus,  International  and the
Funds.  Thus, for the purposes of Regulation Section 240.13d-3, Stephen Feinberg
is deemed to  beneficially own 1,759,702 shares of the Common Stock, or 11.2% of
those deemed issued and outstanding pursuant to Regulation Section 240.13d-3.

          During the past sixty days, the only  transactions in the Common Stock
of the Company by Stephen Feinberg, or any person or entity controlled by him or
any person or entity for which he possesses  voting or  investment  control over
the securities  thereof,  were (i) the  acquisition  of 1,738,702  shares of the
Common Stock, at a price of $16.50 per share, in a private transaction  pursuant
to Rule 144(k),  consummated on March 16, 2000, in accordance  with the terms of
the stock purchase  agreement  described in Item 3 hereof,  (ii) the purchase of
36,000 shares of the Common Stock,  at a price of $14.60 per share,  on February
25, 2000 and (iii) the sale of 15,000 shares of the Common Stock,  at a price of
$16.00 per share,  on February 29, 2000. Each of the  transactions  described in
clauses (ii) and (iii) above were effected in an ordinary brokers transaction.

Item 6.   Contracts, Arrangements, Understandings or Relationships With Respect
          to Securities of the Issuer.

          No contracts,  arrangements,  understandings or similar  relationships
exist with respect to the securities of the Company between Stephen Feinberg and
any person or entity.

Item 7.   Material to be Filed as Exhibits.

          Not applicable



                                    Signature

          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.

                                            May 18, 2000


                                            /s/ Stephen Feinberg

                                            Stephen Feinberg, in his capacity as
                                            the   managing  member  of  Cerberus
                                            Associates,   L.L.C.,   the  general
                                            partner of Cerberus  Partners, L.P.,
                                            and  as  the  investment manager for
                                            each of Cerberus International, Ltd.
                                            and the Funds

      Attention: Intentional misstatements or omissions of fact constitute
               Federal criminal violations (See 18 U.S.C. 1001).