To help ensure accurate results and avoid specimen collection delays, please note the specific collection requirements for this test. Cyclospora testing requires specific collection and preservative requirements that may differ from routine stool studies. Please ensure your office has the appropriate collection supplies available if you anticipate ordering this test.
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Referral/Sendouts
As part of our ongoing transition to Quest Diagnostics as our primary reference laboratory, an update has been made to the saliva collection device used for cortisol testing.
Quick Reference
Test: Cortisol, LC/MS, Saliva [Epic: LAB1232015, Interface: 1232015]
Approved Device: BLUE TOP Salivette® Cortisol Tube
Previously Accepted: White top tube
Status of White Top Tubes: No longer accepted – will be rejected
Action: Discard or return white top tubes and reorder blue top tubes via your supply form
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.
Effective December 3, 2025, meconium drug screen testing for Southeast Michigan will transition from ARUP to Corewell Health Reference Laboratory West.
This change ensures consistent, high-quality testing across all Corewell Health regions and clinically standardizes the services we provide as a system.
What’s Changing:
Southeast Michigan specimens will now be tested at Corewell Health Reference Laboratory West
Collection and transport processes remain unchanged.
Purpose of Test:
Meconium drug screen testing detects and documents fetal drug exposure during approximately the last trimester of a full-term pregnancy
For more information, please refer to the Lab Test Directory: Meconium Drug Testing LAB479
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, Referral/Sendouts
Collection Device Update: Referral STI Testing for Pediatric Patients
Effective March 12, 2025, Corewell Health Laboratories will update the STI testing process for patients under 14 years old. These tests will now be sent to Children’s of Wisconsin Laboratory, aligning with the current in-house testing methods for patients 14 years and older using the Alinity m multi collection tube. Previously, these tests were sent to Quest Diagnostics Laboratory using the Aptima® collection device. Please discontinue use of Aptima® collection devices on March 12, 2025.
We want to inform you about an important update regarding T-Spot test collections and deliveries. Due to severe weather conditions expected to affect parts of the United States, we have been advised by our reference laboratory to suspend the collection and sending of this test on Monday, February 17 after 3 p.m. through Tuesday, February 18. Testing collection will begin again on Wednesday, February 19th, unless the request is extended.
This precaution is necessary to ensure the safety and integrity of the specimens, as well as to avoid any potential delays or issues that could arise from the adverse weather. We appreciate your understanding and cooperation during this time.
We want to inform you about an important update regarding T-Spot, ImmuKnow, and CMV T-Cell Immunity Panel, test collections and deliveries. Due to severe weather conditions expected to affect parts of the United States later this week, we have been advised by our reference laboratory to suspend the collection and sending of these three tests on Thursday, January 9, and Friday, January 10. Testing collection will begin again on Monday, January 13th.
This precaution is necessary to ensure the safety and integrity of the specimens, as well as to avoid any potential delays or issues that could arise from the adverse weather. We appreciate your understanding and cooperation during this time.
Advanced Technology Laboratory, Cytology, Education & Training, Referral/Sendouts
New Test: HPV High Risk Screen with HPV Genotype Reflex
Effective August 26, 2024, Corewell Health Laboratories West will be updating their High-Risk HPV testing. The new assay will be performed on the Abbott Alinity m at Corewell Health Reference Laboratory West, Grand Rapids. Testing will now automatically include HPV Genotype results whenever HPV is detected. There will no longer be a separate charge to the patient for HPV Genotype testing.
There will also be an expanded number of High-Risk HPV Genotypes reported:
- HPV Genotype 16
- HPV Genotype 18
- HPV Genotype 45
- HPV Genotype 31/33/52/58
- HPV Genotype 35/39/51/56/59/66/68
The new assay is FDA approved for Primary screening in addition to co-testing.
Post hysterectomy vaginal specimens will still be a send out test (LAB1230722).