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Quest Diagnostics

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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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Quest Diagnostics - Norwalk Cross Street - Employer Drug Testing Not Offered

40 Cross St,

Ste 260

Norwalk, CT 06851

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1.57 mi away

Schedule Appointment 475-208-6966
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

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1.99 mi away

Schedule Appointment 475-208-6963
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

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4.99 mi away

Schedule Appointment 475-328-4366
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 - Fairfield Post Road - Employer Drug Testing Not Offered

1305 Post Rd,

Ste 101

Fairfield, CT 06824

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7.89 mi away

Schedule Appointment 203-418-4026
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
Quest Diagnostics - Fairfield Black Rock - Employer Drug Testing Not Offered

2150 Black Rock Tpke,

Bank Of America Building 2Nd Floor

Fairfield, CT 06825

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8.57 mi away

Schedule Appointment 203-418-4459
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 - Stamford Summer St

1250 Summer St,

Ste 203

Stamford, CT 06905

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9.06 mi away

Schedule Appointment 475-619-3857
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 - Ridgefield - Employer Drug Testing Not Offered

38A Grove St,

Ridgefield, CT 06877

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11.27 mi away

Schedule Appointment 475-215-6843
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
Quest Diagnostics - Bridgeport Beechmont - Employer Drug Testing Not Offered

3180 Main St,

Beechmont Building 1St Floor

Bridgeport, CT 06606

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11.48 mi away

Schedule Appointment 475-988-0510
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 - Greenwich/Cos Cob-Employer Drug Testing Not Offered

405 E Putnam Ave,

Cos Cob, CT 06807

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12.24 mi away

Schedule Appointment 203-561-8506
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 - Bridgeport East Main Street - Employer Drug Testing Not Offered

970 E Main St,

Bridgeport, CT 06608

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12.3 mi away

Schedule Appointment 203-212-5824
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

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13.19 mi away

Schedule Appointment 475-988-0509
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
Quest Diagnostics - Trumbull White Plains Road - Employer Drug Testing Not Offered

948 White Plains Rd,

Unit 5

Trumbull, CT 06611

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13.19 mi away

Schedule Appointment 203-400-6245
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
Quest Diagnostics - Stratford Lordship Boulevard

555 Lordship Blvd,

First Floor

Stratford, CT 06615

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13.58 mi away

Schedule Appointment 203-290-3145
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
Quest Diagnostics - Trumbull Technology Drive - Employer Drug Testing Not Offered

115 Technology Dr,

1St Floor

Trumbull, CT 06611

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14.22 mi away

Schedule Appointment 475-239-5516
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

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15.11 mi away

Schedule Appointment 203-455-9003
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 - Newtown - Employer Drug Testing Not Offered

228 S Main St,

Tj Maxx Shopping Center

Newtown, CT 06470

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17.54 mi away

Schedule Appointment 475-444-8390
Monday: 6:00 am-12:00 pm , 1:00 pm-3:30 pm
Tuesday: 6:00 am-12:00 pm , 1:00 pm-3:30 pm
Wednesday: 6:00 am-12:00 pm , 1:00 pm-3:30 pm
Thursday: 6:00 am-12:00 pm , 1:00 pm-3:30 pm
Friday: 6:00 am-12:00 pm , 1:00 pm-3:30 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - 120 Main Street Danbury - Employer Drug Testing Not Offered

120 Main St,

Danbury, CT 06810

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17.66 mi away

Schedule Appointment 203-240-7301
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
Quest Diagnostics - Huntington

175 E Main St,

Ste 105

Huntington, NY 11743

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17.84 mi away

Schedule Appointment 631-421-2682
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
Quest Diagnostics - Shelton

515 Bridgeport Ave,

Shelton, CT 06484

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18.63 mi away

Schedule Appointment 475-269-0338
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 - Danbury Germantown

7 Germantown Rd,

Danbury, CT 06810

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18.71 mi away

Schedule Appointment 475-206-0507
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: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Milford - Employer Drug Testing Not Offered

233 Broad St,

Milford, CT 06460

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18.86 mi away

Schedule Appointment 203-306-5066
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: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Bethel - Employer Drug Testing Not Offered

83B Stony Hill Rd Ste 110,

Big Y Shopping Center

Bethel, CT 06801

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18.98 mi away

Schedule Appointment 475-206-0506
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
Quest Diagnostics - Commack

2171 Jericho Tpke,

Ste 102

Commack, NY 11725

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21.33 mi away

Schedule Appointment 516-677-7721
Monday: 6:00 am-3:30 pm
Tuesday: 6:00 am-3:30 pm
Wednesday: 6:00 am-3:30 pm
Thursday: 6:00 am-3:30 pm
Friday: 6:00 am-3:30 pm
Saturday: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Derby - Employer Drug Testing Not Offered

299 Seymour Ave,

Derby, CT 06418

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21.46 mi away

Schedule Appointment 475-777-3484
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 - Prado Norte Lomas de Chapultepec

Av Prado Norte 530,

Lomas De Chapultepec

Mexico City, Mexico, 11000

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21.64 mi away

55-416-0777
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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Our company

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.