Quest Diagnostics
Lab Testing at Quest Diagnostics - Mercy Tower A Psc
Quest Diagnostics Patient Service Center in Saint Louis, MO 63141.
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Address
621 S New Ballas Rd Suite 23Saint Louis, MO 63141
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 | 8:00 AM – 12:00 PM |
| Sunday | Closed |
Nearby alternatives
- Quest Diagnostics - Center For Performance Med701 S New Ballas Rd, Saint Louis, MO 631410.3 mi
- LabCorp Saint Louis747 N New Ballas Rd, Saint Louis, MO 631411.7 mi
- Arcpoint Labs Of St. Louis West11255 Olive Blvd, Saint Louis, MO 631412 mi
- Quest Diagnostics - Wood Lake - Employer Drug Testing Not Offered1585 Woodlake Dr Ste 115, Chesterfield, MO 630173.9 mi
- LabCorp Maryland Heights12685 Dorsett Rd Ste A, Maryland Heights, MO 630434.8 mi
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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.