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Guardant Health and Quest Diagnostics Announce Strategic Collaboration to Broaden Access to Guardant’s Shield™ Blood-based Screening Test in the United States

PALO ALTO, Calif. & SECAUCUS, N.J., September 24, 2025--Guardant Health, Inc. (Nasdaq: GH), a leading precision oncology company, and Quest Diagnostics (NYSE: DGX), a leader in diagnostic information services, today announced a broad strategic collaboration to make Guardant’s Shield™ blood-based screening test available to physicians and patients served by Quest in the United States.

articleQuest Diagnostics IncorporatedSeptember 24, 20256/company/quest-diagnostics-incorporated/news/guardant-health-and-quest-diagnostics-announce-strategic-collaboration-to-broaden-access-to-guardants-shieldtm-blood-based-screening-test-in-the-united-states
Guardant Health and Quest Diagnostics Announce Strategic Collaboration to Broaden Access to Guardant’s Shield™ Blood-based Screening Test in the United States

About this update from Quest Diagnostics Incorporated

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Quest DiagnosticsGuardant Healthcolorectal cancerscreening testcancer screeningprimary care physiciansThe Shieldblood drawcancerblood draws