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Corewell Health and Quest Diagnostics to Enter into Joint Venture

Corewell Health and Quest Diagnostics have signed a definitive agreement to enter into a joint venture to expand access to innovative, quality and affordable laboratory services in Michigan.

The joint venture, Diagnostic Lab of Michigan, LLC, will be based at a state-of-the-art laboratory facility at the Corewell Health Southfield Center in Southfield, Michigan. The future 100,000-square-foot facility will feature advanced technologies, such as automated microbiology and high-throughput molecular testing.

In addition, Quest will provide the full complement of its Collaborative Lab Solutions (Co-Lab), including reference laboratory testing, professional laboratory management services, laboratory workforce and supply chain management, and analytics, for all of Corewell Health's 21 inpatient and outpatient hospital labs. These hospitals labs are located across the state and will remain open after the new lab is constructed.

"We are thrilled to collaborate with Quest Diagnostics, a leader in diagnostic lab services. Quest has a proven track record of delivering innovative and high-quality diagnostic services that put patients first. This new joint venture will support our ongoing efforts to make health care more affordable and accessible."
- Chad Tuttle, Chief Operating Officer, Corewell Health
Press Release
Page Published: September 16, 2025

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