EX-22 2 dgx09302025ex22.htm EX-22
Exhibit 22
Subsidiary Guarantors of Securities
As of October 21, 2025, the following subsidiaries of Quest Diagnostics Incorporated provided, subject to the terms of such senior notes, unconditional and irrevocable guarantees to the senior notes listed below that were issued by Quest Diagnostics Incorporated pursuant to an offering registered under the Securities Act of 1933, as amended:

Securities | Issuer | Subsidiary Guarantor | State of Organization
6.95% Senior Notes due 2037 5.75% Senior Notes due 2040 | Quest Diagnostics Incorporated | American Medical Laboratories, Incorporated | Delaware
AmeriPath, Inc. | Delaware
AmeriPath Consolidated Labs, Inc. | Florida
AmeriPath Florida, LLC | Delaware
AmeriPath Hospital Services Florida, LLC | Delaware
AmeriPath Kentucky, Inc. | Kentucky
AmeriPath New York, LLC | Delaware
AmeriPath Texas, Inc. | Delaware
Blueprint Genetics Inc. | Delaware
Diagnostic Pathology Services, Inc. | Oklahoma
ExamOne World Wide, Inc. | Pennsylvania
ExamOne World Wide of NJ, Inc. | New Jersey
Kailash B. Sharma, M.D., Inc. | Georgia
LabOne, LLC | Missouri
LabOne of Ohio, Inc. | Delaware
Ocmulgee Medical Pathology Association, Inc. | Georgia
Quest Diagnostics Clinical Laboratories, Inc. | Delaware
Quest Diagnostics Holdings Incorporated | Delaware
Quest Diagnostics Incorporated | Maryland
Quest Diagnostics Incorporated | Nevada
Quest Diagnostics Investments LLC | Delaware
Quest Diagnostics LLC | Connecticut
Quest Diagnostics LLC | Illinois
Quest Diagnostics LLC | Massachusetts
Quest Diagnostics Nichols Institute | California
Quest Diagnostics Nichols Institute, Inc. | Virginia
Quest Diagnostics of Pennsylvania Inc. | Delaware
Specialty Laboratories, Inc. | California
Unilab Corporation | Delaware