Exhibit 99.1 Quest Diagnostics Reports Second Quarter 2025 Financial Results; Raises Guidance for Full Year 2025 SECAUCUS, N.J., July 22, 2025 - Quest Diagnostics Incorporated (NYSE: DGX), a leading provider of diagnostic information services, today announced financial results for the second quarter ended June 30, 2025. "Through continued execution of our strategy, we delivered a strong second quarter, with revenues growing 15.2% which includes 5.2% from organic revenues, as well as adjusted EPS growth of 1 ...