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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Address
15945 Clayton Rd Ste 100Ballwin, MO 63011
St. Louis County
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 Ballwin15421 Clayton Rd Ste 301, Ballwin, MO 630111.3 mi
- Quest Diagnostics - Wood Lake - Employer Drug Testing Not Offered1585 Woodlake Dr Ste 115, Chesterfield, MO 630174.5 mi
- Quest Diagnostics - Chesterfield17300 N Outer 40 Ste 104, Chesterfield, MO 630054.6 mi
- Quest Diagnostics - Eureka98 The Legends Pkwy Ste 108, Eureka, MO 630258 mi
- Quest Diagnostics - Center For Performance Med701 S New Ballas Rd, Saint Louis, MO 631418.1 mi
More lab options around Ballwin
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.