-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 AVIZrseDHV6/3T0qDskVeg==

<SEC-DOCUMENT>0001238921-03-000002.txt : 20030929
<SEC-HEADER>0001238921-03-000002.hdr.sgml : 20030929
<ACCEPTANCE-DATETIME>20030929193645
ACCESSION NUMBER:		0001238921-03-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030929
FILED AS OF DATE:		20030929

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HIBBERD CHRISTOPHER R
		CENTRAL INDEX KEY:			0001238921

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21873
		FILM NUMBER:		03916146

	BUSINESS ADDRESS:	
		STREET 1:		C/O BIOSITE INC
		STREET 2:		11030 ROSELLE STREET
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		8584554808

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BIOSITE INC
		CENTRAL INDEX KEY:			0000834306
		STANDARD INDUSTRIAL CLASSIFICATION:	IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
		IRS NUMBER:				330288606
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11030 ROSELLE ST
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		6194554808

	MAIL ADDRESS:	
		STREET 1:		11030 ROSELLE ST
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BIOSITE DIAGNOSTICS INC
		DATE OF NAME CHANGE:	19960710
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-09-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000834306</issuerCik>
        <issuerName>BIOSITE INC</issuerName>
        <issuerTradingSymbol>BSTE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001238921</rptOwnerCik>
            <rptOwnerName>HIBBERD CHRISTOPHER R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>BIOSITE INCORPORATED</rptOwnerStreet1>
            <rptOwnerStreet2>11030 ROSELLE STREET</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92121</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP Bus Dlpmnt &amp; Strat Planning</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

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            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2003-09-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>27</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.16</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13901</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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    </nonDerivativeTable>

    <derivativeTable>

        <derivativeTransaction>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2003-09-29</value>
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                <transactionCode>M</transactionCode>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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                <footnoteId id="F1"/>
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            <expirationDate>
                <value>2009-04-20</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1110</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>

        <derivativeTransaction>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
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            <transactionAmounts>
                <transactionShares>
                    <value>487</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>1999-04-20</value>
                <footnoteId id="F1"/>
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            <expirationDate>
                <value>2009-04-20</value>
            </expirationDate>
            <underlyingSecurity>
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                </underlyingSecurityTitle>
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                    <value>487</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>623</value>
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                <value>Incentive Stock Option (right to buy)</value>
            </securityTitle>
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            <transactionDate>
                <value>2003-09-29</value>
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            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>1999-04-20</value>
                <footnoteId id="F1"/>
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            <expirationDate>
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                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeTransaction>
            <securityTitle>
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            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2003-09-29</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>2863</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>1999-06-09</value>
                <footnoteId id="F1"/>
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            <expirationDate>
                <value>2009-06-09</value>
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            <ownershipNature>
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                    <value>D</value>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Option vests daily over a four-year period commencing on the date of grant, except that no options are exercisable for the first six months after the date of grant.</footnote>
    </footnotes>

    <remarks>
End of period holdings reflects 922 shares purchased in connection with the Company's ESPP plan on 6/30/03.
</remarks>

    <ownerSignature>
        <signatureName>By: Robyn Shutak  For: Chris R. Hibberd</signatureName>
        <signatureDate>2003-09-29</signatureDate>
    </ownerSignature>

</ownershipDocument>

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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----