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 Tag
Test Discontinuation
Effective June 3, 2026, due to vendor raw material supply shortages, all Lipoprotein (a) testing will be transitioned from in-house assay to Quest Diagnostics, Wood Dale, IL.
| Current (In-House) | Quest Diagnostics | |
| Test Name | Lipoprotein (a) | Lipoprotein (a) |
| Test code | LAB1230915 | LAB1232338 |
| Preferred Specimen Type | Serum | Serum |
| Reference Range | ≤30 mg/dL | <75 nmol/L |
| Turn Around Time | 2 days | 4 days |
.
| Quest Diagnostics Risk Stratification Risk | nmol/L |
| Optimal | <75 |
| Moderate | 75-125 |
| High | >125 |
NOTE: With this transition, there will be changes in reference ranges and units of measurement. The units will change from mass units (mg/dL) to molar units (nmol/L); molar units are the preferred units per the 2026 American College of Cardiology/American Heart Association Joint Committee Guidelines. There are no changes to the specimen type. Turnaround time will be 4 days.
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
Go-Live Date: December 17, 2025
Following Phase One in November, where tests previously referred to ARUP and some Mayo Clinic Lab tests were transitioned to Quest Diagnostics, we are now moving into Phase Two of this important change. Corewell Health Laboratory is continuing its transition to Quest Diagnostics as our primary reference testing partner.
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
Specimen Collection and Test Updates – August 2025
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.
Effective September 3, 2025, Drug Screen with Alcohol and Drug Screen without Alcohol will be discontinued for inpatient testing. The replacement test would be Drug Screen, Immunoassay, Urine [LAB677] for ED and inpatient.
Drug Screen Toxicology, Immunoassay, Urine [LAB3227] is available for outpatient testing.
For any questions or concerns, please contact your account manager or use the contact us link above.
Test Information
Discontinued Tests:
- Drug Screen with Alcohol, Immunoassay, Urine [LAB2111694]
- Drug Screen without Alcohol, Immunoassay, Urine [LAB2111041]