EXHIBIT 99.2
 
                         NOTICE OF GUARANTEED DELIVERY
                                   TO TENDER
              UNREGISTERED 11% SENIOR SUBORDINATED NOTES DUE 2008
                      (INCLUDING THOSE IN BOOK-ENTRY FORM)
                                       OF
                     MEDIQ/PRN LIFE SUPPORT SERVICES, INC.
 
      PURSUANT TO THE EXCHANGE OFFER AND PROSPECTUS DATED           , 1998
 
    As set forth in the Prospectus (as defined below), this form or one
substantially equivalent hereto must be used to accept the Exchange Offer (as
defined below) if certificates for unregistered 11% Senior Subordinated Notes
due 2008 (the "Old Notes") of MEDIQ/PRN Life Support Services, Inc. are not
immediately available or time will not permit a holder's Old Notes or other
required documents to reach the Exchange Agent (as defined below) on or prior to
the Expiration Date (as defined below), or the procedure for book-entry transfer
cannot be completed on a timely basis. This form may be delivered by facsimile
transmission, by registered or certified mail, by hand, or by overnight delivery
service to the Exchange Agent. See "THE EXCHANGE OFFERS--Procedures for
Tendering" in the Prospectus.
 
THE EXCHANGE OFFER FOR THE OLD NOTES (THE "EXCHANGE OFFER") AND WITHDRAWAL
RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON           , 1998 (THE
"EXPIRATION DATE"), UNLESS THE EXCHANGE OFFER IS EXTENDED BY THE COMPANY.
 
                 THE EXCHANGE AGENT FOR THE EXCHANGE OFFER IS:
                    UNITED STATES TRUST COMPANY OF NEW YORK
 

                                                                  
     BY OVERNIGHT COURIER AND             BY HAND UP TO 4:30 PM:         BY REGISTERED OR CERTIFIED MAIL:
     BY HAND AFTER 4:30 PM ON
    THE EXPIRATION DATE ONLY:
 
   United States Trust Company         United States Trust Company         United States Trust Company
           of New York                         of New York                         of New York
     770 Broadway, 13th Floor                  111 Broadway                        P.O. Box 844
     New York, New York 10003                  Lower Level                        Cooper Station
  Attn: Corporate Trust Services         New York, New York 10006         New York, New York 10276-0844
                                      Attn: Corporate Trust Services      Attn: Corporate Trust Services
                                        Telephone: (800) 548-6565
                                        Facsimile: (212) 780-0592
                                              (212) 420-6211

 
    (Originals of all documents sent by facsimile should be sent promptly by
                         registered or certified mail,
                  by hand, or by overnight delivery service.)
 
   DELIVERY OF THIS NOTICE TO AN ADDRESS OR TRANSMISSION OF INSTRUCTIONS VIA
 FACSIMILE OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.

Ladies and Gentlemen:
 
    The undersigned hereby tenders to MEDIQ/PRN Life Support Services, Inc., a
Delaware corporation (the "Company"), in accordance with the Company's offer,
upon the terms and subject to the conditions set forth in the Prospectus dated
          , 1998 (the "Prospectus"), and in the accompanying Letter of
Transmittal, receipt of which is hereby acknowledged, $     in aggregate
principal amount of the Old Notes pursuant to the guaranteed delivery procedures
described in the Prospectus.
 
Name(s) of Registered Holder(s):
 
________________________________________________________________________________
                             (Please Type or Print)
 
Address: _______________________________________________________________________
 
________________________________________________________________________________
 
Area Code & Telephone No.: _____________________________________________________
 
Certificate Number(s) for
Old Notes (if available): ______________________________________________________
 
Total Principal Amount
Tendered and Represented
by Certificate(s): $ ___________________________________________________________
 
Signature of Registered Holder(s): _____________________________________________
 
Dated: _________________________________________________________________________
 
/ /   The Depository Trust Company
     (Check if Old Notes will be tendered
     by book-entry transfer)
 
Account Number: ________________________________________________________________

                     THE GUARANTEE BELOW MUST BE COMPLETED
 
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, being a member of or participant in the Securities Transfer
Agents Medallion Program, the New York Stock Exchange Medallion Signature
Program or the Stock Exchange Medallion Program or an "eligible guarantor
institution" within the meaning of Rule 17Ad-15 under the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), hereby guarantees (a) that the
above named person(s) "own(s)" the Old Notes tendered hereby within the meaning
of Rule 14e-4 under the Exchange Act ("Rule 14e-4"), (b) that such tender of
such Old Notes complies with Rule 14e-4 and (c) to deliver to the Exchange Agent
the certificates representing the Old Notes tendered hereby or confirmation of
book-entry transfer of such Old Notes into the Exchange Agent's account at The
Depository Trust Company, in proper form for transfer, together with a Letter of
Transmittal (or facsimile thereof), properly completed and duly executed, with
any required signature guarantees and any other required documents, within three
New York Stock Exchange trading days after the earlier of (i) the date of
execution hereof and (ii) the Expiration Date.
 
Name of Firm: __________________________________________________________________
 
Address: _______________________________________________________________________
 
________________________________________________________________________________
 
Area Code & Telephone No.: _____________________________________________________
 
Authorized Signature ___________________________________________________________
 
Name: __________________________________________________________________________
 
Title: _________________________________________________________________________
 
Dated: _________________________________________________________________________
 
NOTE:  DO NOT SEND CERTIFICATES OF OLD NOTES WITH THIS FORM. CERTIFICATES OF OLD
       NOTES SHOULD BE SENT ONLY WITH A PROPERLY COMPLETED AND DULY EXECUTED
       LETTER OF TRANSMITTAL.