40 Cross St,
Ste 260
Norwalk, CT 06851
Get Directions
Lab testing, laboratory and office locations around the world
Quest Diagnostics has headquarters in the U.S. and operations in India, Ireland, and Mexico. Our products and services are used by customers in over 130 countries. We also collaborate with many international diagnostic laboratories, hospitals and clinics to help improve human health around the world.
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0.59 mi away
Monday:
7:00 am-4:00 pm
Tuesday:
7:00 am-4:00 pm
Wednesday:
7:00 am-4:00 pm
Thursday:
7:00 am-4:00 pm
Friday:
7:00 am-4:00 pm
Saturday:
7:30 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - Norwalk 148 East Avenue - Employer Drug Testing Not Offered
148 East Ave,
Norwalk, CT 06851
Get Directions0.64 mi away
Monday:
7:30 am-4:30 pm
Tuesday:
7:30 am-4:30 pm
Wednesday:
7:30 am-4:30 pm
Thursday:
7:30 am-4:30 pm
Friday:
7:30 am-4:30 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - Darien
557 Post Rd,
Darien, CT 06820
Get Directions2.94 mi away
Monday:
7:00 am-4:00 pm
Tuesday:
7:00 am-4:00 pm
Wednesday:
7:00 am-4:00 pm
Thursday:
7:00 am-4:00 pm
Friday:
7:00 am-4:00 pm
Saturday:
Closed
Sunday:
Closed
7.23 mi away
Monday:
6:00 am-5:00 pm
Tuesday:
6:00 am-5:00 pm
Wednesday:
6:00 am-5:00 pm
Thursday:
6:00 am-5:00 pm
Friday:
6:00 am-5:00 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
9.09 mi away
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:
7:00 am-12:00 pm
Sunday:
Closed
10.24 mi away
Monday:
6:00 am-5:00 pm
Tuesday:
6:00 am-5:00 pm
Wednesday:
6:00 am-5:00 pm
Thursday:
6:00 am-5:00 pm
Friday:
6:00 am-5:00 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - Greenwich/Cos Cob-Employer Drug Testing Not Offered
405 E Putnam Ave,
Cos Cob, CT 06807
Get Directions10.44 mi away
Monday:
6:30 am-4:00 pm
Tuesday:
6:30 am-4:00 pm
Wednesday:
6:30 am-4:00 pm
Thursday:
6:30 am-4:00 pm
Friday:
6:30 am-4:00 pm
Saturday:
7:00 am-11:00 am
Sunday:
Closed
Quest Diagnostics - Ridgefield - Employer Drug Testing Not Offered
38A Grove St,
Ridgefield, CT 06877
Get Directions12.73 mi away
Monday:
7:00 am-4:00 pm
Tuesday:
7:00 am-4:00 pm
Wednesday:
7:00 am-4:00 pm
Thursday:
7:00 am-4:00 pm
Friday:
7:00 am-4:00 pm
Saturday:
8:00 am-12:00 pm
Sunday:
Closed
13.19 mi away
Monday:
6:00 am-5:00 pm
Tuesday:
6:00 am-5:00 pm
Wednesday:
6:00 am-5:00 pm
Thursday:
6:00 am-5:00 pm
Friday:
6:00 am-5:00 pm
Saturday:
6:00 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - Bridgeport East Main Street - Employer Drug Testing Not Offered
970 E Main St,
Bridgeport, CT 06608
Get Directions13.83 mi away
Monday:
7:00 am-4:00 pm
Tuesday:
7:00 am-4:00 pm
Wednesday:
7:00 am-4:00 pm
Thursday:
7:00 am-4:00 pm
Friday:
7:00 am-4:00 pm
Saturday:
Closed
Sunday:
Closed
Quest Diagnostics - Bridgeport Barnum Avenue - Employer Drug Testing Not Offered
1450 Barnum Ave,
Bridgeport, CT 06610
Get Directions14.68 mi away
Monday:
7:30 am-2:00 pm
Tuesday:
7:30 am-2:00 pm
Wednesday:
7:30 am-2:00 pm
Thursday:
7:30 am-2:00 pm
Friday:
7:30 am-2:00 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
14.91 mi away
Monday:
7:00 am-2:00 pm
Tuesday:
7:00 am-2:00 pm
Wednesday:
7:00 am-2:00 pm
Thursday:
7:00 am-2:00 pm
Friday:
7:00 am-4:00 pm
Saturday:
Closed
Sunday:
Closed
15.09 mi away
Monday:
6:00 am-4:00 pm
Tuesday:
6:00 am-4:00 pm
Wednesday:
6:00 am-4:00 pm
Thursday:
6:00 am-4:00 pm
Friday:
6:00 am-4:00 pm
Saturday:
Closed
Sunday:
Closed
15.94 mi away
Monday:
7:00 am-3:30 pm
Tuesday:
7:00 am-3:30 pm
Wednesday:
7:00 am-3:30 pm
Thursday:
7:00 am-3:30 pm
Friday:
7:00 am-3:30 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
16.31 mi away
Monday:
6:00 am-4:30 pm
Tuesday:
6:00 am-4:30 pm
Wednesday:
6:00 am-4:30 pm
Thursday:
6:00 am-4:30 pm
Friday:
6:00 am-4:30 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - Stratford Main Street - Employer Drug Testing Not Offered
2890 Main St,
Stratford, CT 06614
Get Directions16.63 mi away
Monday:
6:00 am-5:00 pm
Tuesday:
6:00 am-5:00 pm
Wednesday:
6:00 am-5:00 pm
Thursday:
6:00 am-5:00 pm
Friday:
6:00 am-5:00 pm
Saturday:
7:00 am-12:00 pm
Sunday:
Closed
Quest Diagnostics - 120 Main Street Danbury - Employer Drug Testing Not Offered
120 Main St,
Danbury, CT 06810
Get Directions19.48 mi away
Monday:
8:00 am-12:00 pm , 12:30 pm-4:30 pm
Tuesday:
8:00 am-12:00 pm , 12:30 pm-4:30 pm
Wednesday:
8:00 am-12:00 pm , 12:30 pm-4:30 pm
Thursday:
8:00 am-12:00 pm , 12:30 pm-4:30 pm
Friday:
8:00 am-12:00 pm , 12:30 pm-4:30 pm
Saturday:
Closed
Sunday:
Closed
19.5 mi away
Monday:
6:00 am-3:00 pm
Tuesday:
6:00 am-3:00 pm
Wednesday:
6:00 am-3:00 pm
Thursday:
6:00 am-3:00 pm
Friday:
6:00 am-3:00 pm
Saturday:
7:00 am-1:30 pm
Sunday:
Closed
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Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services. Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services.
Quest®, Quest Diagnostics®, any associated logos, and all associated Quest Diagnostics registered or unregistered trademarks are the property of Quest Diagnostics. All third-party marks—® and ™—are the property of their respective owners. © 2026 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only.