Chemistry, West Michigan

Specimen Type Change for Outpatient Chemistry Tests – Effective December 3, 2025

Effective Date: December 3, 2025

What’s Changing?

The preferred specimen type for most outpatient Chemistry tests will change from:

Lithium Heparin Gel PST (mint green-top with gel) to Serum Separator SST (gold-top with gel)

Why the Change?

SST tubes provide improved specimen quality and stability, supporting more accurate test results.

Key Points

SST (gold-top) is now the preferred tube for outpatient Chemistry specimens.

PST (mint green-top) will still be accepted for the respective tests.

Resources

View Complete Test List

Lab Catalog

(Note: This change only impacts West Michigan; Southeast and Southwest Michigan sites already use gold-top SST tubes for many of these tests.)

Questions?

Use the Contact Us link above.

November 21, 2025 by
General Information, West Michigan

Update: Laboratory Requisition Shipping Timeline – Please Plan Ahead

We want to share an important update regarding the shipping timeline for requisition orders.

As part of our ongoing efforts to streamline operations and improve service delivery, Corewell Health has transitioned to a new external printing vendor for requisition materials. While this change supports long-term efficiency, it does come with a temporary adjustment in turnaround time.

Requisition shipments will now take up to 12 business days to arrive, which is a longer timeframe than previously experienced.

To help ensure your office remains fully stocked and avoids any supply interruptions, we recommend placing orders at least three weeks in advance of running out of requisitions.

We appreciate your understanding and cooperation as we adapt to this new process. If you have any questions or need support with ordering, please don’t hesitate to reach out.

Thank you for your continued partnership!

November 7, 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
Emergency, Inpatient, Test Utilization, West Michigan

Hypercoagulation/Thrombophilia Tests No Longer Available for Adult Emergency Room (ED) and Inpatient

Effective 10/29/2025, hypercoagulation/thrombophilia test ordering will no longer be available in the adult inpatient and emergency department settings at Corewell Health West.

This change aligns the hospital system with the American Society of Hematology Choosing Wisely initiative. This will decrease unnecessary costly testing in the inpatient setting and help to prevent inappropriate diagnoses. Continue Reading

October 24, 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