Quest Diagnostics
Lab Testing at Proactive Work Ontario
Quest partner location in Ontario, CA 91761.
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 909-390-3400 before visiting to confirm they accept your lab order.
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Address
1801 Excise Ave Ste 108Ontario, CA 91761
San Bernardino County
Hours
| Monday | 7:00 AM – 5:00 PM |
| Tuesday | 7:00 AM – 5:00 PM |
| Wednesday | 7:00 AM – 5:00 PM |
| Thursday | 7:00 AM – 5:00 PM |
| Friday | 7:00 AM – 5:00 PM |
| Saturday | Closed |
| Sunday | Closed |
Nearby alternatives
- Ontario Testing Center, Inc402 S Milliken Ave Ste E2, Ontario, CA 917611.6 mi
- Comp - Ontario59 S Milliken Ave Ste 100, Ontario, CA 917611.8 mi
- Examone - Riverside9220 Haven Ave Ste 250, Rancho Cucamonga, CA 917303.1 mi
- LabCorp Rancho Cucamonga10801 Foothill Blvd Ste 104, Rancho Cucamonga, CA 917304.5 mi
- Quest Diagnostics - Eastvale Orbis - Employer Drug Testing Not Offered6102 Orbis Way Ste 510, Eastvale, CA 928804.6 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.