EXHIBIT 10.2
                                       
                             COMMERCIAL GUARANTY


Borrower:  LABORATORY SPECIALISTS, INC.
           (TIN: 72-0846066)
           P.O. Box 435
           Belle Chasse, LA 70037

Lender:    Hibernia National Bank
           (TIN: 72-0210640)
           Loan Administration Department
           313 Carondelet Street
           New Orleans, LA 70130

Guarantor: Laboratory Specialists of America, Inc.
           P.O. Box 435
           Belle Chasse, LA 70037

AMOUNT OF GUARANTY.  The amount of this Guaranty Is Unlimited.

DEFINITIONS.  The following terms shall have the following meanings when used in
this Agreement:

   Agreement.  The word "Agreement" means this Guaranty Agreement as this 
   Agreement may be amended or modified from time to time.

   Borrower.  The word "Borrower" means individually, collectively and 
   interchangeably LABORATORY SPECIALISTS, INC..

   Guarantor.  The word "Guarantor" means individually, collectively and 
   interchangeably Laboratory Specialists of America, Inc. and all other 
   persons guaranteeing payment and satisfaction of Borrower's Indebtedness 
   as hereinafter defined.

   Indebtedness.  The word "Indebtedness" means individually, collectively, 
   interchangeably and without limitation any and all present and future 
   loans, loan advances, extensions of credit, obligations and/or 
   liabilities that Borrower may now and/or in the future owe to and/or 
   incur in favor of Lender, whether direct or indirect, or by way of 
   assignment or purchase of a participation interest, and whether absolute 
   or contingent, voluntary or involuntary, determined or undetermined, 
   liquidated or unliquidated, due or to become due, secured or unsecured, 
   and whether Borrower may be liable individually, jointly or solidarity 
   with others, whether primarily or secondarily, or as a guarantor or 
   otherwise, and whether now existing or hereafter arising, of 

                                    -37-



   every nature and kind whatsoever, in principal, interest, costs, 
   expenses and attorneys' fees and other fees and charges, including 
   without limitation Borrower's indebtedness and obligations under a 
   certain promissory note in favor of Lender dated August 25, 1998 In the 
   fixed principal amount of U.S. $1,000,000.00. In addition, all Interest 
   thereon, costs, expenses, attorneys' fees and other fees and charges 
   related thereto under Borrower's Indebtedness shall be fully guaranteed 
   hereunder.

   Lender.  The word "Lender" means Hibernia National Bank TIN: 72-0210640, 
   its successors and assigns, and any subsequent holder or holders of 
   Borrower's Indebtedness.

GUARANTEE OF BORROWER'S INDEBTEDNESS.  Guarantor hereby absolutely and 
unconditionally agrees to, and by these presents does hereby, guarantee the 
prompt and punctual payment, performance and satisfaction of any and all of 
Borrower's present aid future Indebtedness In favor of Lender.

CONTINUING GUARANTY.  THIS IS A CONTINUING GUARANTY AGREEMENT UNDER WHICH 
GUARANTOR AGREES TO GUARANTEE PAYMENT OF BORROWER'S PRESENT AND FUTURE 
INDEBTEDNESS IN FAVOR OF LENDER ON A CONTINUING BASIS.  Guarantor's 
obligations and liability under this Agreement shall be open and continuous 
in effect. Guarantor intends to and does hereby guarantee at all times the 
prompt and punctual payment, performance and satisfaction of all of 
Borrower's present and future Indebtedness in favor of Lender.  Accordingly, 
any payments made on Borrower's Indebtedness will not discharge or diminish 
the obligations and liability of Guarantor under this Agreement for any 
remaining and succeeding Indebtedness of Borrower in favor of Lender.

JOINT, SEVERAL AND SOLIDARY LIABILITY.  Guarantor's obligations and liability 
under this Agreement shall be on a "solidary" or "joint and several" basis 
along with Borrower to the same degree and extent as if Guarantor had been 
and/or will be a co-borrower, co-principal obligor and/or co-maker of 
Borrower's Indebtedness.  In the event that there is more than one Guarantor 
under this Agreement, or in the event that there are other guarantors, 
endorsers or sureties of all or any portion of Borrower's Indebtedness, 
Guarantor's obligations and liability hereunder shall further be on a 
"solidary" or "joint and several" basis along with such other guarantors, 
endorsers and/or sureties.

DURATION OF GUARANTY.  This Agreement and Guarantor's obligations and 
liability hereunder shall remain in full force and effect until such time as 
this Agreement may be canceled  or otherwise terminated by Lender under a 
written cancellation instrument in favor of Guarantor (subject to the 
automatic reinstatement provisions herein below).  It is anticipated that 
fluctuations may occur in the aggregate amount of Borrower's Indebtedness 
guaranteed under this Agreement and it is specifically acknowledged and 
agreed to by Guarantor that reductions in the amount of Borrower's 
Indebtedness, even to zero ($0.00) dollars, prior to Lender's written 
cancellation of this Agreement, shall not constitute or give rise to a 
termination of this Agreement.

CANCELLATION OF AGREEMENT; EFFECT.  Unless otherwise indicated under such a 
written 

                                    -38-



cancellation instrument, Lender's agreement to terminate or otherwise cancel 
this Agreement shall affect only, and shall be expressly limited to, 
Guarantor's continuing obligations and liability to guarantee Borrower's 
Indebtedness incurred, originated and/or extended (without prior commitment) 
after the date of such a written cancellation instrument; with Guarantor 
remaining fully obligated and liable under this Agreement for any and all of 
Borrower's Indebtedness incurred, originated, extended, or committed to prior 
to the date of such a written cancellation instrument.  Nothing under this 
Agreement or under any other agreement or understanding by and between 
Guarantor and Lender, shall in any way obligate, or be construed to obligate, 
Lender to agree to the subsequent termination or cancellation of Guarantor's 
obligations and liability hereunder; it being fully understood and agreed to 
by Guarantor that Lender has and intends to continue to rely on Guarantor's 
assets, income and financial resources in extending credit and other 
Indebtedness to and in favor of Borrower, and that to release Guarantor from 
Guarantor's continuing obligations and liabilities under this Agreement would 
so prejudice Lender that Lender may, within its sole and uncontrolled 
discretion and judgment, refuse to release Guarantor from any of its 
continuing obligations and liability under this Agreement for any reason 
whatsoever as long as any of Borrower's Indebtedness remains unpaid and 
outstanding, or otherwise.

DEFAULT.  Should any event of default occur or exist under any of Borrower's 
Indebtedness in favor of Lender, Guarantor unconditionally and absolutely 
agrees to pay Lender the then unpaid amount of Borrower's Indebtedness, in 
principal, interest, costs, expenses, attorneys' fees and other fees and 
charges.  Such payment or payments shall be made at Lender's offices 
indicated above, immediately following demand by Lender.

GUARANTOR'S WAIVERS.  Guarantor hereby waives:

     (a)  Notice of Lander's acceptance of this Agreement.

     (b)  Presentment for payment of Borrower's Indebtedness, notice of dishonor
     and of nonpayment, notice of intention to accelerate, notice of
     acceleration, protest and notice of protest, collection or institution of
     any suit or other action by Lender in collection thereof, including any
     notice of default in payment thereof, or other notice to, or demand for
     payment thereof, on any party.

     (c)  Any right to require Lender to notify Guarantor of any nonpayment
     relating to any collateral directly or indirectly securing Borrower's
     Indebtedness, or notice of any action or nonaction on the pan of Borrower,
     Lender, or any other guarantor, surety or endorser of Borrower's
     Indebtedness, or notice of the creation of any new or additional
     Indebtedness subject to this Agreement

     (d)  Any rights to demand or require collateral security from the Borrower
     or any other person as provided under applicable Louisiana law or
     otherwise.

     (e)  Any right to require Lender to notify Guarantor of the terms, time and
     place of any public or private sale of any collateral directly or
     indirectly securing Borrower's Indebtedness.

                                    -39-



     (f)  Any "one action" or "anti-deficiency" law or any other law which may
     prevent Lender from bringing any action, including a claim for deficiency,
     against Guarantor, before or after Lender's commencement or completion of
     any foreclosure action, or any action in lieu of foreclosure.

     (g)  Any election of remedies by Lender that may destroy or impair
     Guarantor's subrogation rights or Guarantor's right to proceed for
     reimbursement against Borrower or any other guarantor, surety or endorser
     of Borrower's Indebtedness, including without limitation, any loss of
     rights Guarantor may suffer by reason of any law limiting, qualifying, or
     discharging Borrower's Indebtedness.

     (h)  Any disability or other defense of Borrower, or any other guarantor,
     surety or endorser, or any other person, or by reason of the cessation from
     any cause whatsoever, other than payment in full of Borrower's
     Indebtedness.

     (i)  Any statute of limitations or prescriptive period, if at the time an
     action or suit brought by Lender against Guarantor is commenced, there is
     any outstanding Indebtedness of Borrower to Lender which is barred by any
     applicable statute of limitations or prescriptive period.

Guarantor warrants and agrees that each of the waivers set forth above is 
made with Guarantor's full knowledge of its significance and consequences, 
and that, under the circumstances, such waivers are reasonable and not 
contrary to public policy or law.  If any such waiver is determined to be 
contrary to any applicable law or public policy, such waiver shall be 
effective only to the extent permitted by law.

GUARANTOR'S SUBORDINATION OF RIGHTS. in the event that Guarantor should for 
any reason (a) advance or lend monies to Borrower, whether or not such funds 
are used by Borrower to make payment(s) under Borrower's Indebtedness, and/or 
(b) make any payment(s) to Lender or others for and on behalf of Borrower 
under Borrower's Indebtedness, and/or (c) make any payment to Lender in total 
or partial satisfaction of Guarantor's obligations and liabilities under this 
Agreement, and/or (d) if any of Guarantor's property is used to pay or 
satisfy any of Borrower's Indebtedness, Guarantor hereby agrees that any and 
all rights that Guarantor may have or acquire to collect from or to be 
reimbursed by Borrower (or from or by any other guarantor, endorser or surety 
of Borrower's Indebtedness), whether Guarantor's rights of collection or 
reimbursement arise by way of subrogation to the rights of Lender or 
otherwise, shall in all respects, whether or not Borrower is presently or 
subsequently becomes insolvent, be subordinate, inferior and junior to the 
rights of Lender to collect and enforce payment, performance and satisfaction 
of Borrower's then remaining Indebtedness, until such time as Borrower's 
Indebtedness is fully paid and satisfied.  In the event of Borrower's 
insolvency or consequent liquidation of Borrower's assets, through 
bankruptcy, by an assignment for the benefit of creditors, by voluntary 
liquidation, or otherwise, the assets of Borrower applicable to the payment 
of claims of both Lender and Guarantor shall be paid to Lender and shall be 
first applied by Lender to Borrower's then remaining Indebtedness.  Guarantor 
hereby assigns to Lender all claims which it may have or acquire against 
Borrower or any assignee or trustee of Borrower in bankruptcy; provided that, 
such assignment shall be effective only for the 

                                    -40-



purpose of assuring to Lender full payment of Borrower's Indebtedness 
guaranteed under this Agreement.

If now or hereafter (a) Borrower shall be or become insolvent, and (b) 
Borrower's Indebtedness shall not at all times until paid be fully secured by 
collateral pledged by Borrower, Guarantor hereby forever waives and 
relinquishes in favor of Lender and Borrower, and their respective 
successors, any claim or right to payment Guarantor may now have or hereafter 
have or acquire against Borrower, by subrogation or otherwise, so that at no 
time shall Guarantor be or become a "creditor" of Borrower within the meaning 
of 11 U.S.C. section 547(b), or any successor provision of the Federal 
bankruptcy laws.

GUARANTOR'S RECEIPT OF PAYMENTS.  Guarantor further agrees to refrain from 
attempting to collect and/or enforce any of Guarantor's collection and/or 
reimbursement rights against Borrower (or against any other guarantor, surety 
or endorser of Borrower's Indebtedness), arising by way of subrogation or 
otherwise, until such time as all of Borrower's then remaining Indebtedness 
in favor of Lender is fully paid and satisfied.  In the event that Guarantor 
should for any reason whatsoever receive any payment(s) from Borrower (or any 
other guarantor, surety or endorser of Borrower's Indebtedness) that Borrower 
(or such a third party) may owe to Guarantor, for any of the reasons stated 
above, Guarantor agrees to accept such payment(s) in trust for and on behalf 
of Lender, advising Borrower (or the third party payee) of such fact.  
Guarantor further unconditionally agrees to immediately deliver such funds to 
Lender, with such funds being hold by Guarantor over any interim period, in 
trust for Lender.  In the event that Guarantor should for any reason 
whatsoever receive any such funds from Borrower (or any third party), and 
Guarantor should deposit such funds in one or more of Guarantor's deposit 
accounts, no matter where located, Lender shall have the right to attach any 
and all of Guarantor's deposit accounts in which such funds were deposited, 
whether or not such funds were commingled with other monies of Guarantor, and 
whether or not such funds then remain on deposit in such an account or 
accounts.  To this end and to secure Guarantor's obligations under this 
Agreement, Guarantor collaterally assigns and pledges to Lender, and grants 
to Lender a continuing security interest in, any and all of Guarantor's 
present and future rights, title and interest in and to all monies that 
Guarantor may now and/or in the future maintain on deposit with banks, 
savings and loan associations and other entities (other than tax deferred 
accounts with Lender), in which Guarantor may at any time deposit any such 
funds that may be received frm Borrower (or any other guarantor, endorser or 
surety of Borrower's Indebtedness) in favor of Lender.

DEPOSIT ACCOUNTS.  As collateral security for repayment of Guarantor's 
obligations hereunder and under any additional guaranties previously granted 
or to be granted by Guarantor in the future, and additionally as collateral 
security for any present and future indebtedness of Guarantor in favor of 
Lender (with the exception of any indebtedness under a consumer credit card 
account), Guarantor is granting Lender a continuing security interest in any 
and all funds that Guarantor may now and in the future have on deposit with 
Lender or in certificates of deposit or other deposit accounts as to which 
Guarantor is an account holder (with the exception of IRA, pension, and other 
tax-deferred deposits).  Guarantor further agrees that Lender may at any time 
apply any funds that Guarantor may have on deposit with Lender or in 
certificates of deposit or other deposit accounts as to which 

                                    -41-



Guarantor is an account holder against the unpaid balance of any and all 
other present and future obligations and indebtedness of Guarantor to Lender, 
in principal, interest, fees, costs, expenses, and attorneys' fees.

ADDITIONAL COVENANTS.  Guarantor agrees that Lender may, at its sole option, 
at any time, and from time to time, without the consent of or notice to 
Guarantor, or any of them, or to any other party, and without incurring any 
responsibility to Guarantor or to any other party, and without impairing or 
releasing any of Guarantor's obligations or liabilities under this Agreement:

     (a)  Make additional secured and/or unsecured loans to Borrower.

     (b)  Discharge, release or agree not to sue any party (including, but not
     limited to, Borrower or any other guarantor, surety, or endorser of
     Borrower's Indebtedness), who is or may be liable to Lender for any of
     Borrower's Indebtedness.

     (c)  Sell, exchange, release, surrender, realize upon, or otherwise deal
     with, in any manner and in any order, any collateral directly or indirectly
     securing repayment of any of Borrower's Indebtedness.

     (d)  Alter, renew, extend, accelerate, or otherwise change the manner,
     place, terms and/or times of payment or other terms of Borrower's
     Indebtedness, or any part thereof, including any increase or decrease in
     the rate or rates of interest on any of Borrower's Indebtedness.

     (e)  Settle or compromise any of Borrower's Indebtedness.

     (f)  Subordinate and/or agree to subordinate the payment of all or any part
     of Borrower's Indebtedness, or Lander's security rights in any collateral
     directly or indirectly securing any such Indebtedness, to the payment
     and/or security rights of any other present and/or future creditors of
     Borrower.

     (g)  Apply any payments and/or proceeds to any of Borrower's Indebtedness
     in such priority or with such preferences as Lender may determine in its
     sole discretion, regardless of which of Borrower's Indebtedness then
     remains unpaid.

     (h)  Take or accept any other collateral security or guaranty for any or
     all of Borrower's Indebtedness.

     (i)  Enter into, deliver, modify, amend, or waive compliance with, any
     instrument or arrangement evidencing, securing or otherwise affecting, all
     or any part of Borrower's Indebtedness.

NO IMPAIRMENT OF GUARANTOR'S OBLIGATIONS.  No course of dealing between 
Lender and Borrower (or any other guarantor, surety or endorser of Borrower's 
Indebtedness), nor any failure or delay on the part of Lender to exercise any 
of Lender's rights and remedies under this 

                                    -42-



Agreement or any other agreement or agreements by and between Lender and 
Borrower (or any other guarantor, surety or endorser), shall have the effect 
of impairing or releasing Guarantor's obligations and liabilities to Lender, 
or of waiving any of Lender's rights and remedies under this Agreement or 
otherwise.  Any partial exercise of any rights and remedies granted to Lender 
shall furthermore not constitute a waiver of any of Lender's other rights and 
remedies; it being Guarantor's intent and agreement that Lender's rights and 
remedies shall be cumulative in nature.  Guarantor further agrees that, 
should Borrower default under any of its Indebtedness, any waiver or 
forbearance on the part of Lender to pursue Lender's available rights and 
remedies shall be binding upon Lender only to the extent that Lender 
specifically agrees to such waiver or forbearance in writing.  A waiver or 
forbearance on the part of Lender as to one event of default shall not 
constitute a waiver or forbearance as to any other default.

NO RELEASE OF GUARANTOR.  Guarantor's obligations and liabilities under this 
Agreement shall not be released, impaired, reduced, or otherwise affected by, 
and shall continue in full force and effect notwithstanding the occurrence of 
any event, including without limitation any one or more of the following 
events:

     (a)  The death, insolvency, bankruptcy, arrangement, adjustment,
     composition, liquidation, disability, dissolution, or lack of authority
     (whether corporate, partnership or trust) of Borrower (or any person acting
     on Borrower's behalf), or of any other guarantor, surety or endorser of
     Borrower's Indebtedness.

     (b)  Any payment by Borrower, or any other-party, to Lender that is held to
     constitute a preferential transfer or a fraudulent conveyance under any
     applicable !aw, or any such amounts or payment which, for any reason,
     Lender is required to refund or repay to Borrower or to any other person.

     (c)  Any dissolution of Borrower, or any sale, lease or transfer of all or
     any part of Borrower's assets.

     (d)  Any failure of Lender to notify Guarantor of the making of additional
     loans or other extensions of credit in reliance on this Agreement.

AUTOMATIC REINSTATEMENT.  This Agreement and Guarantor's obligations and 
liabilities hereunder shall continue to be effective, and/or shall 
automatically and retroactively be reinstated, if a release or discharge has 
occurred, or if at any time, any payment or part thereof to Lender with 
respect to any of Borrower's Indebtedness, is rescinded or must otherwise be 
restored by Lender pursuant to any insolvency, bankruptcy, reorganization, 
receivership, or any other debt relief granted to Borrower or to any other 
party to Borrower's Indebtedness or any such security therefor.  In the event 
that Lender must rescind or restore any payment received in total or partial 
satisfaction of Borrower's Indebtedness, any prior release or discharge from 
the terms of this Agreement given to Guarantor shall be without effect, and 
this Agreement and Guarantor's obligations and liabilities hereunder shall 
automatically and retroactively be renewed and/or reinstated and shall remain 
in full 

                                    -43-



force and effect to the same degree and extent as if such a release or 
discharge had never been granted.  It is the intention of Lender and 
Guarantor that Guarantor's obligations and liabilities hereunder shall not be 
discharged except by Guarantor's full and complete performance and 
satisfaction of such obligations and liabilities; and then only to the extent 
of such performance.

LEGAL EXISTENCE.  Guarantor is a corporation duly organized, validly existing 
and in good standing under the laws of the State of Oklahoma.  Guarantor is 
duly qualified and in good standing as a foreign corporation in each 
jurisdiction where in the nature of the business transacted and the property 
owned by Guarantor makes such qualification necessary.  Guarantor's guaranty 
of Borrower's Indebtedness and this Agreement does not violate Guarantor's 
Articles of incorporation or Bylaws.  Guarantor has taken all corporate 
action necessary to authorize the execution, delivery and performance of this 
Agreement.

REPRESENTATIONS AND WARRANTIES BY GUARANTOR.  Guarantor represents and 
warrants that:

     (a)  Guarantor has the lawful power to own its properties and to engage in
     its business as presently conducted.

     (b)  Guarantor's guaranty of Borrower's Indebtedness and Guarantor's
     execution, delivery and performance of this Agreement are not in violation
     of any laws and will not result in a default under any contract, agreement,
     or instrument to which Guarantor is a party, or by which Guarantor or its
     property may be bound.

     (c)  Guarantor has agreed and consented to execute this Agreement and to
     guarantee Borrower's Indebtedness in favor of Lender, at Borrower's request
     and not at the request of Lander.

     (d)  Guarantor will receive and/or has received a direct or indirect
     material benefit from the transactions contemplated herein and/or arising
     out of Borrower's Indebtedness.

     (e)  This Agreement, when executed and delivered to Lender, will constitute
     a legal-and-binding obligation of Guarantor, enforceable in accordance with
     its terms.

     (f)  Guarantor has established adequate means of obtaining information from
     Borrower on a continuing basis regarding Borrower's financial condition.

     (g) Lender has made no representations to Guarantor as to the
     creditworthiness of Borrower.

ADDITIONAL OBLIGATIONS OF GUARANTOR.  So long as this Agreement remains in 
effect, Guarantor has not and will not, without Lender's prior written 
consent, sell, lease, assign, pledge, hypothecate, encumber, transfer, or 
otherwise dispose of all or substantially all of Guarantor's assets.  
Guarantor agrees to keep adequately informed of any facts, events or 
circumstances which might in any way affect Guarantor's risks under this 
Agreement.  Guarantor further agrees that Lender shall 

                                    -44-



have no obligation to disclose to Guarantor any information or material 
relating to Borrower or Borrower's Indebtedness.

ADDITIONAL DOCUMENTS; FINANCIAL STATEMENTS.  Upon the reasonable request of 
Lender, Guarantor will, at any time, and from time to time, execute and 
deliver to Lender any and all such financial instruments and documents, and 
supply such additional information, as may be necessary or advisable in the 
opinion of Lender to obtain the full benefits of this Agreement.  Guarantor 
further agrees to provide Lender with such financial statements and other 
related information at such frequencies and in such detail as Lender may 
reasonably request.

TRANSFER OF INDEBTEDNESS.  This Agreement is for the benefit of Lender and 
for such other person or persons as may from time to time become or be the 
holders of all or any part of Borrower's Indebtedness.  This Agreement shall 
be transferrable and negotiable with the same force and affect and to the 
same extent as Borrower's Indebtedness may be transferrable; it being 
understood and agreed to by Guarantor that, upon any transfer or assignment 
of all or any part of Borrower's Indebtedness, the holder of such 
Indebtedness shall have all of the rights and remedies granted to Lender 
under this Agreement.  Guarantor further agrees that, upon any transfer of 
all or any portion of Borrower's Indebtedness, Lender may transfer and 
deliver any and all collateral securing repayment of such Indebtedness 
(including, but not limited to, any collateral provided by Guarantor) to the 
transferee of such Indebtedness, and such collateral shall secure any and all 
of Borrower's Indebtedness in favor of such a transferee.  Guarantor 
additionally agrees that, after any such transfer or assignment has taken 
place, Lender shall be fully discharged from any and all liability and 
responsibility to Borrower and Guarantor with respect to such collateral, and 
the transferee thereafter shall be vested with all the powers and rights with 
respect to such collateral.

CONSENT TO PARTICIPATION.  Guarantor recognizes and agrees that Lender may, 
from time to time, one or more times, transfer all or any part of Borrower's 
Indebtedness through sales of participation interests in such Indebtedness to 
one or more third party lenders. Guarantor specifically agrees and consents 
to all such transfers and assignments, and Guarantor further waives any 
subsequent notice of such transfers and assignments as may be provided under 
Louisiana law. Guarantor additionally agrees that the purchaser of a 
participation  interest in Borrower's Indebtedness will be considered as the 
absolute owner of a percentage interest of such Indebtedness and that such a 
purchaser will have all of the rights granted under any participation 
agreement governing the sale of such a participation interest.  Guarantor 
waives any rights of offset that Guarantor may have against Lender and/or any 
purchaser of such a participation interest, and Guarantor unconditionally 
agrees that either Lender or such a purchaser may enforce Guarantor's 
obligations and liabilities under this Agreement, irrespective of the failure 
or insolvency of Lender or any such purchaser.

NOTICES.  Any notice provided in this Agreement must be in writing and will be
considered as given on the day it is delivered by hand or deposited in the U.S.
mail, postage prepaid, addressed to the person to whom the notice is to be given
at the address shown above or at such other addresses as any party may designate
to the other in writing.  If there is more than one Guarantor under this

                                    -45-



Agreement, notice to any Guarantor shall constitute notice to all Guarantors.

ADDITIONAL GUARANTIES.  Guarantor recognizes and agrees that Guarantor may have
previously granted, and may in the future grant, one or more additional
guaranties of Borrower's Indebtedness in favor of Lender.  Should this occur,
the execution of this Agreement and any additional guaranties on the part of
Guarantor will not be construed as a cancellation of this Agreement or any of
Guarantor's additional guaranties; it being Guarantor's full intent and
agreement that all such guaranties of Borrower's Indebtedness in favor of Lender
shall remain in full force and effect and shall be cumulative in nature and
effect.

MISCELLANEOUS PROVISIONS.  The following miscellaneous provisions are a part of
this Guaranty:

   Amendment.  No amendment, modification, consent or waiver of any 
   provision of this Agreement, and no consent to any departure by 
   Guarantor therefrom, shall be effective unless the same shall be in 
   writing signed by a duly authorized officer of Lender, and then shall be 
   effective only as to the specific instance and for the specific purpose 
   for which given.

   Applicable Law.  This Guaranty has been delivered to Lender and accepted 
   by Lender in the State of Louisiana.  This Guaranty shall be governed by 
   and construed in accordance with the laws of the State of Louisiana.

   Caption Headings.  Caption headings of the sections of this Agreement 
   are for convenience purposes only and are not to be used to interpret or 
   to define their provisions.  In this Agreement, whenever the context so 
   requires, the singular includes the plural and the plural also includes 
   the singular.

   Severability.  If any provision of this Agreement is hold to be illegal, 
   invalid or unenforceable under present or future laws effective during 
   the term hereof, such provision shall be fully severable.  This 
   Agreement shall be construed and enforceable as if the illegal, invalid 
   or unenforceable provision had never comprised a part of it, and the 
   remaining provisions of this Agreement shall remain in full force and 
   effect and shall not be affected by the illegal, invalid or 
   unenforceable provision or by its severance herefrom.  Furthermore, in 
   lieu of such illegal, invalid or unenforceable provision, there shall be 
   added automatically as a part of this Agreement, a provision as similar 
   in terms to such illegal, invalid or unenforceable provision as may be 
   possible and legal, valid and enforceable.

   Successors and Assigns Bound.  Guarantor's obligations and liabilities 
   under this Agreement shall be binding upon Guarantor's successors, 
   heirs, legatees, devisees, administrators, executors and assigns.

   Waive Jury.  Guarantor and Lender hereby waive the right to any jury 
   trial in any action, proceeding, or counterclaim brought by either 
   against the other.

                                    -46-



EACH UNDERSIGNED GUARANTOR ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS
GUARANTY AND AGREES TO ITS TERMS.  IN ADDITION, EACH GUARANTOR UNDERSTANDS THAT
THIS GUARANTY IS EFFECTIVE UPON GUARANTOR'S EXECUTION AND DELIVERY OF THIS
GUARANTY TO LENDER AND THAT THE GUARANTY WILL CONTINUE UNTIL TERMINATED.  NO
FORMAL ACCEPTANCE BY LENDER IS NECESSARY TO MAKE THIS GUARANTY EFFECTIVE.  THIS
GUARANTY IS DATED AUGUST 25, 1998.

GUARANTOR:

Laboratory Specialists of America, Inc.

By: Arthur R. Peterson, Jr., Treasurer

                                    -47-