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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Note: tests available at this location depend on its services. Confirm by calling before visiting.

Address

1801 Excise Ave Ste 108
Ontario, CA 91761
San Bernardino County

909-390-3400

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, Inc
402 S Milliken Ave Ste E2, Ontario, CA 91761
1.6 mi
Comp - Ontario
59 S Milliken Ave Ste 100, Ontario, CA 91761
1.8 mi
Examone - Riverside
9220 Haven Ave Ste 250, Rancho Cucamonga, CA 91730
3.1 mi
LabCorp Rancho Cucamonga
10801 Foothill Blvd Ste 104, Rancho Cucamonga, CA 91730
4.5 mi
Quest Diagnostics - Eastvale Orbis - Employer Drug Testing Not Offered
6102 Orbis Way Ste 510, Eastvale, CA 92880
4.6 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.