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Southwest Michigan

Corewell Health System, Southeast Michigan, Southwest Michigan, West Michigan

Update on Corewell Health and Quest Diagnostics Joint Venture

Dear Valued Client:

We are pleased to announce that Corewell Health and Quest Diagnostics, a leading national laboratory company, have completed the formation of their laboratory services joint venture (JV) named Diagnostic Lab of Michigan, LLC.

This multifaceted collaboration will broaden access to innovative, high-value laboratory services for you and other providers in Michigan. Excitingly, work has begun on a new state-of-the-art laboratory in Southfield, Michigan, to service the JV. This laboratory will not be operational until the beginning of 2027. We will provide updates on the laboratory start date as work progresses.

Improving Access to Diagnostic Innovation in Michigan Over Time

Corewell Health and Quest Diagnostics share the goal to broaden access to quality, accessible and affordable laboratory services for providers and patients in Michigan. We expect Diagnostic Lab of Michigan to concentrate the shared resources and expertise of Corewell Health and Quest Diagnostics on improving access to diagnostic innovation in Michigan.

Over time, Diagnostic Lab of Michigan will provide several new benefits, including:

• Greater convenience for patients, as Corewell Health and Quest Diagnostics combine their patient service networks to reach more patients in Michigan.
• Michigan-grown diagnostic innovation, including through automation in the new laboratory.
• Broad health plan access to support patient affordability.

Your current Corewell Health Lab Account Representative will continue supporting you as part of the new joint venture laboratory. If you have questions, please contact Matt Boring, Sales Director, 248-345-5604.

We appreciate your business and look forward to the continuation of high-quality laboratory services for our patients, providers and communities.

Sincerely,

Sarah Britton
Vice President, Laboratory Services
Corewell Health

Corewell Letter to Clients Close

January 6, 2026 by
General Information, Southwest Michigan, West Michigan

Outpatient Laboratory Hours of Operation Update

Effective January 1, 2026, the following outpatient laboratory (PSC’s) hours will be updated.

 

Corewell Health Big Rapids Hospital Laboratory   

605 Oak St., Big Rapids, 49307

Monday to Friday: 6:30 a.m. to 6 p.m.; Saturday: 7 a.m. to 11 a.m.

 

Corewell Health Gerber Hospital Laboratory – Newaygo

211 W. Pine Lake Drive, Newaygo, 49337

Monday to Thursday: 7 a.m. to noon.,12:30 p.m. to 3 p.m.; Friday: 7 a.m. to noon

 

Corewell Health Greenville Hospital Laboratory

615 S. Bower St., Greenville, 4883

Monday to Friday: 6:30 a.m. to 6 p.m.; Saturday: 7 a.m. to 11 a.m.

 

Corewell Health Greenville Hospital Laboratory – Lakeview 

8650 W Howard City-Edmore Road, Lakeview, 48850

Monday to Friday: 7 a.m. to 3:30 p.m.; Saturday: 8 a.m. to noon

 

Corewell Health Lakeland Hospitals Laboratory – Niles   

31 N. St. Joseph Ave., Niles, 49120

Monday to Friday: 6:30 a.m. to 5 p.m.; Saturday: 7 a.m. to 11 a.m.

 

Corewell Health Pennock Hospital Laboratory

1009 W. Green St., Hastings, 49058

Monday to Friday: 6 a.m. to 6 p.m.; Saturday: 7 a.m. to 11 a.m.

 

Corewell Health Pennock Hospital Laboratory – Lake Odessa 

4294 Laurel Drive, Lake Odessa, 48849

Monday to Friday: 7 a.m. to 3 p.m.

 

Corewell Health Reed City Hospital Laboratory

300 N. Patterson Road, Reed City, 49677

Monday to Friday: 6:30 a.m. to 6 p.m.; Saturday: 7 a.m. to 11 a.m.

 

Corewell Health Watervliet Hospital Laboratory 

400 Medical Park Drive, Watervliet, 49098

Monday to Friday: 7 a.m. to 3:30 p.m.

 

Corewell Health Zeeland Hospital Laboratory

8333 Felch St., Zeeland, 49464

Monday to Friday: 6 a.m. to 6 p.m.; Saturday: 7 a.m. to 11 a.m.

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December 30, 2025 by
Referral/Sendouts, Southeast Michigan, Southwest Michigan, West Michigan

Primary Reference Lab Change to Quest Diagnostics

Effective November 19, 2025

Corewell Health Laboratory is transitioning to Quest Diagnostics as our primary reference testing laboratory. This change means that nearly all referral and send-out tests will now be performed by Quest Diagnostics. A limited number of tests will continue to be sent to other laboratories to ensure we meet the needs of our patients and clinicians.

What You Need to Know:

  • Test Crosswalks: Tests currently performed at ARUP and Mayo Clinic Labs will be matched to comparable tests at Quest Diagnostics.
  • Discontinued Tests: Tests with low utilization or those no longer deemed clinically necessary will be discontinued.
  • New LAB Numbers: All tests will receive new LAB numbers, which must be updated in your EMR compendium if interfaced.
  • Collection Devices: Some tests may require different collection devices.
  • Transition Timeline:
    • November 19, 2025: Focus on tests currently referred to ARUP.
    • December 17, 2025: Focus on tests currently referred to Mayo Clinic Labs.
  • Crosswalk Resources: Crosswalks between current and future test offerings will be provided to help you prepare.
  • Test Directory Access: Please refer to your regional Lab Test Directory for details on specific test changes. ARUP and Mayo Clinic Lab test pages will include links to the corresponding Quest Diagnostic tests.

We understand the significance of these changes and are committed to supporting your practice throughout this transition. Updates and modifications will be communicated promptly.

Contact Information:

  • Corewell Health East Sendouts: 248.551.9045
  • Corewell Health West Referrals: 616.267.2753
  • Or use the Contact Us link above.
October 27, 2025 by
General Information, Southwest Michigan, West Michigan

Temporary Disruption in Requisition Printing – October 15 to November 3

Due to a vendor transition for printing services at Corewell Health Laboratories Southwest and West, there will be a temporary pause in printing paper requisitions and forms.

Disruption Dates:
October 15 – November 3, 2025

What You Need to Know:

  • No requisitions or forms will be printed or distributed during this time.
  • If you anticipate needing paper requisitions or forms, please email CHWLabServices@corewellhealth.org by October 14 to place an advance order.
  • Orders received during the disruption period will be held and processed on November 3, once printing resumes.

We appreciate your understanding and apologize for any inconvenience this may cause.

October 7, 2025 by
Compliance & Safety, Southwest Michigan, West Michigan

Lab Catalog URL Update – Action Required by December 31, 2025

Effective December 31, 2025, the URL corewellhealth.testcatalog.org will be discontinued.
There will be no automatic redirect to the new site.

To avoid disruption of service, please update your saved links or browser favorites for the Lab Catalog (also known as the Lab Test Directory) to:

👉 corewellhealth.org/labcatalog

This landing page allows you to select the appropriate region for you or your patient’s specimen and will always direct you to the most up-to-date catalog URL for your area.

✅ Update your bookmarks today to ensure uninterrupted access to lab testing information.

October 7, 2025 by