-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 VxBxpFQRACNQP5E0K2ofym61gEcdVgihxZyiD27jUmRAL0a4FZsx6pIsAK1T9yDZ
 in8c7Lpz5K3K52snlCTQNQ==

<SEC-DOCUMENT>0001104659-05-059590.txt : 20051207
<SEC-HEADER>0001104659-05-059590.hdr.sgml : 20051207
<ACCEPTANCE-DATETIME>20051207163418
ACCESSION NUMBER:		0001104659-05-059590
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20051202
FILED AS OF DATE:		20051207
DATE AS OF CHANGE:		20051207

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KNUDSON MARK B
		CENTRAL INDEX KEY:			0001243513

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21982
		FILM NUMBER:		051249850

	MAIL ADDRESS:	
		STREET 1:		C/O DIAMETRICS MEDICAL INC
		STREET 2:		2658 PATTON ROAD
		CITY:			ROSEVILLE
		STATE:			MN
		ZIP:			55113

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DIAMETRICS MEDICAL INC
		CENTRAL INDEX KEY:			0000895380
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS [3845]
		IRS NUMBER:				411663185
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2658 PATTON RD
		CITY:			ROSEVILLE
		STATE:			MN
		ZIP:			55113
		BUSINESS PHONE:		6516398035

	MAIL ADDRESS:	
		STREET 1:		2658 PATTON ROAD
		CITY:			ROSEVILLE
		STATE:			MN
		ZIP:			55113
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-12-02</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000895380</issuerCik>
        <issuerName>DIAMETRICS MEDICAL INC</issuerName>
        <issuerTradingSymbol>DMED</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001243513</rptOwnerCik>
            <rptOwnerName>KNUDSON MARK B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2800 PATTON ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PAUL</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55113</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-12-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>151433</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23437</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Reporting Person disposed of all securities of the Issuer beneficially owned by him for an aggregate purchase price of $50 in cash.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Mark B. Knudson</signatureName>
        <signatureDate>2005-12-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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