<SEC-DOCUMENT>0001959173-24-008276.txt : 20241129
<SEC-HEADER>0001959173-24-008276.hdr.sgml : 20241129
<ACCEPTANCE-DATETIME>20241129144202
ACCESSION NUMBER:		0001959173-24-008276
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20241129
DATE AS OF CHANGE:		20241129

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUEST DIAGNOSTICS INC
		CENTRAL INDEX KEY:			0001022079
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MEDICAL LABORATORIES [8071]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		IRS NUMBER:				161387862
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-12215
		FILM NUMBER:		241516037

	BUSINESS ADDRESS:	
		STREET 1:		500 PLAZA DRIVE
		CITY:			SECAUCUS
		STATE:			NJ
		ZIP:			07094
		BUSINESS PHONE:		9735202700

	MAIL ADDRESS:	
		STREET 1:		500 PLAZA DRIVE
		CITY:			SECAUCUS
		STATE:			NJ
		ZIP:			07094

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORNING CLINICAL LABORATORIES INC
		DATE OF NAME CHANGE:	19960903

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PREVOZNIK MICHAEL E
		CENTRAL INDEX KEY:			0001222679
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		C/O QUEST DIAGNOSTICS
		STREET 2:		500 PLAZA DRIVE
		CITY:			SECAUCUS
		STATE:			NJ
		ZIP:			07094
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001222679</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001022079</issuerCik>
      <issuerName>QUEST DIAGNOSTICS INC</issuerName>
      <secFileNumber>001-12215</secFileNumber>
      <issuerAddress>
        <com:street1>500 PLAZA DRIVE</com:street1>
        <com:city>SECAUCUS</com:city>
        <com:stateOrCountry>NJ</com:stateOrCountry>
        <com:zipCode>07094</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>9735202700</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>PREVOZNIK MICHAEL E</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>35146</noOfUnitsSold>
      <aggregateMarketValue>5731302.05</aggregateMarketValue>
      <noOfUnitsOutstanding>111615181</noOfUnitsOutstanding>
      <approxSaleDate>11/29/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>11/29/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Options Granted 02/18/2019</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>35146</amountOfSecuritiesAcquired>
      <paymentDate>11/29/2024</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Michael Prevoznik</name>
        <address>
          <com:street1>500 Plaza Drive</com:street1>
          <com:city>Secaucus</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07094</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/29/2024</saleDate>
      <amountOfSecuritiesSold>32551</amountOfSecuritiesSold>
      <grossProceeds>5044516.36</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>11/29/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>08/30/2024</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Andrew Glade, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Michael Prevoznik</signature>
    </noticeSignature>
  </formData>
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