Effective July 8, 2026, the Protein Electrophoresis, CSF and Serum will no longer be performed in-house. The new panel will now be sent to Quest Diagnostics.
Browsing Category
Southwest Michigan
Niles, Southwest Michigan, St. Joseph, Watervliet
Changes to Outpatient Occult Blood (FIT) Stool Testing (Corewell Health Southwest Region)
Effective Tuesday, May 26, 2026, outpatient occult blood testing (stool) will no longer be performed at Corewell Health Lakeland St. Joseph Laboratory and will instead be routed or mailed to Corewell Health Reference Laboratory in Grand Rapids, MI (35 Michigan St.) for processing.
In addition, the collection kits will be updated from OC-Light™ S FIT collection kits to OC-Auto™ collection kits.
Effective March 4, 2026, Corewell Health Laboratories in West Michigan will discontinue performing testosterone testing (LAB173 and LAB2111222) and Corewell Health Southwest Michigan will discontinue Testosterone Free and Total testing (LAB173)
The following replacements will be available as a send out to Quest Diagnostics:
⇒Testosterone, Total, MS – Epic Code: LAB1232313
⇒Testosterone, Free, Bioavailable and Total, MS – Epic Code: LAB1232237
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
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.
The following information was updated in the Lab Catalog.
All changes are for Corewell Health Laboratories in Southwest and West Michigan. For Laboratories in Southeast Michigan, please visit:corewellhealth.org/labcatalog and navigate to the Southeast Michigan site.
The following information was updated in the Lab Catalog.
All changes are for Corewell Health Laboratories in Southwest and West Michigan. For Laboratories in Southeast Michigan, please visit:corewellhealth.org/labcatalog and navigate to the Southeast Michigan site.
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.
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.