Quest Diagnostics
Lab Testing at Mercy Hospital Washington
Hospital outpatient lab in Washington, MO 63090.
Hospital Outpatient Lab
This is a hospital outpatient lab. Most hospital outpatient labs accept walk-in third-party lab orders, but some require a physician referral or appointment. Calling ahead is recommended.
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Address
901 E 5th St 1st FloorWashington, MO 63090
Franklin County
Hours
| Monday | 8:00 AM – 5:00 PM |
| Tuesday | 8:00 AM – 5:00 PM |
| Wednesday | 8:00 AM – 5:00 PM |
| Thursday | 8:00 AM – 5:00 PM |
| Friday | 8:00 AM – 5:00 PM |
| Saturday | Closed |
| Sunday | Closed |
Nearby alternatives
- Quest Diagnostics - Mercy Patients First901 Patients First Dr, Washington, MO 630900.3 mi
- LabCorp Wentzville801 Medical Dr Ste 100, Wentzville, MO 6338519.8 mi
- Quest Diagnostics - Wentzville - Employer Drug Testing Not Offered1201 Wentzville Pkwy Ste 117, Wentzville, MO 6338520.3 mi
- Quest Diagnostics - Eureka98 The Legends Pkwy Ste 108, Eureka, MO 6302520.6 mi
- Quest Diagnostics - O'fallon3449 Pheasant Meadow Dr Ste 101, O Fallon, MO 6336821.2 mi
More lab options around Washington
About this location
Hospital outpatient lab. 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.