Quest Diagnostics

Lab Testing at Mercy - Clayton

Quest partner location in Ballwin, MO 63011.

Partner Location

This location is part of Quest's partner network. Services and availability may differ from a standard Quest Patient Service Center. Please call 636-487-2771 before visiting to confirm they accept your lab order.

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Note: tests available at this location depend on its services. Confirm by calling before visiting.

Address

15945 Clayton Rd Ste 100
Ballwin, MO 63011
St. Louis County

636-487-2771

Hours

Monday	6:30 AM – 5:00 PM
Tuesday	6:30 AM – 5:00 PM
Wednesday	6:30 AM – 5:00 PM
Thursday	6:30 AM – 5:00 PM
Friday	6:30 AM – 5:00 PM
Saturday	Closed
Sunday	Closed

Nearby alternatives

LabCorp Ballwin
15421 Clayton Rd Ste 301, Ballwin, MO 63011
1.3 mi
Quest Diagnostics - Wood Lake - Employer Drug Testing Not Offered
1585 Woodlake Dr Ste 115, Chesterfield, MO 63017
4.5 mi
Quest Diagnostics - Chesterfield
17300 N Outer 40 Ste 104, Chesterfield, MO 63005
4.6 mi
Quest Diagnostics - Eureka
98 The Legends Pkwy Ste 108, Eureka, MO 63025
8 mi
Quest Diagnostics - Center For Performance Med
701 S New Ballas Rd, Saint Louis, MO 63141
8.1 mi

About this location

Quest partner location. Quest Diagnostics operates one of the largest networks of clinical laboratories in the United States, offering a wide range of diagnostic tests for patients, physicians, and employers.

Listing last updated 2026-04-25.