Quest Diagnostics
Lab Testing at Quest Diagnostics - O'fallon
Quest Diagnostics Patient Service Center in O Fallon, MO 63368.
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Address
3449 Pheasant Meadow Dr Ste 101O Fallon, MO 63368
St. Charles County
Hours
| Monday | 6:30 AM – 3:00 PM |
| Tuesday | 6:30 AM – 3:00 PM |
| Wednesday | 6:30 AM – 3:00 PM |
| Thursday | 6:30 AM – 3:00 PM |
| Friday | 6:30 AM – 3:00 PM |
| Saturday | Closed |
| Sunday | Closed |
Nearby alternatives
- LabCorp Saint Charles1475 Kisker Rd Ste 140, Saint Charles, MO 633044.3 mi
- LabCorp O Fallon1002 Peruque Crossing Ct, O Fallon, MO 633665.6 mi
- LabCorp Saint Peters205 First Executive Ave, Saint Peters, MO 633766.9 mi
- Quest Diagnostics - Chesterfield17300 N Outer 40 Ste 104, Chesterfield, MO 630057.2 mi
- Quest Diagnostics - St Peters4101 Mexico Rd Ste E, Saint Peters, MO 633767.4 mi
More lab options around O Fallon
About this location
Quest Diagnostics Patient Service Center. 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.