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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 - Smithtown NY

300 E Main St,

Ste 3A

Smithtown, NY 11787

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1.91 mi away

Schedule Appointment 631-626-6201
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Hauppauge

490 Wheeler Rd,

Ste 190

Hauppauge, NY 11788

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2.72 mi away

Schedule Appointment 516-677-7724
Monday: 6:00 am-1:00 pm
Tuesday: 6:00 am-1:00 pm
Wednesday: 6:00 am-1:00 pm
Thursday: 6:00 am-1:00 pm
Friday: 6:00 am-1:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Commack

2171 Jericho Tpke,

Ste 102

Commack, NY 11725

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3.97 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 - Centereach - Employer Drug Testing Not Offered

2112 Middle Country Rd,

Centereach, NY 11720

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6.56 mi away

Schedule Appointment 631-372-2060
Monday: 8:00 am-4:00 pm
Tuesday: 8:00 am-4:00 pm
Wednesday: 8:00 am-4:00 pm
Thursday: 8:00 am-4:00 pm
Friday: 8:00 am-4:00 pm
Saturday: 8:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - East Setauket Technology Drive

23 Technology Dr,

Ste 2

East Setauket, NY 11733

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7.29 mi away

Schedule Appointment 516-677-7723
Monday: 6:30 am-3:30 pm
Tuesday: 6:30 am-3:30 pm
Wednesday: 6:30 am-3:30 pm
Thursday: 6:30 am-3:30 pm
Friday: 6:30 am-3:30 pm
Saturday: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Bay Shore

8 Saxon Ave,

Ste D

Bay Shore, NY 11706

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8.59 mi away

Schedule Appointment 516-677-7719
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Selden

91 College Plz,

Unit A

Selden, NY 11784

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8.68 mi away

Schedule Appointment 516-677-7731
Monday: 6:30 am-3:30 pm
Tuesday: 6:30 am-3:30 pm
Wednesday: 6:30 am-3:30 pm
Thursday: 6:30 am-3:30 pm
Friday: 6:30 am-3:30 pm
Saturday: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Port Jefferson

1010 Route 112,

2nd Fl

Port Jefferson Station, NY 11776

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10.0 mi away

Schedule Appointment 516-677-7729
Monday: 6:30 am-3:30 pm
Tuesday: 6:30 am-3:30 pm
Wednesday: 6:30 am-3:30 pm
Thursday: 6:30 am-3:30 pm
Friday: 6:30 am-3:30 pm
Saturday: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Huntington

175 E Main St,

Ste 105

Huntington, NY 11743

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10.22 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 - Sayville

160 Middle Rd,

Sayville, NY 11782

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10.68 mi away

Schedule Appointment 516-677-7734
Monday: 7:00 am-3:00 pm
Tuesday: 7:00 am-3:00 pm
Wednesday: 7:00 am-3:00 pm
Thursday: 7:00 am-3:00 pm
Friday: 7:00 am-3:00 pm
Saturday: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Medford - Employer Drug Testing Not Offered

570 Expressway Dr S,

Ste 101

Medford, NY 11763

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11.43 mi away

Schedule Appointment 516-677-7727
Monday: 6:00 am-2:30 pm
Tuesday: 6:00 am-2:30 pm
Wednesday: 6:00 am-2:30 pm
Thursday: 6:00 am-2:30 pm
Friday: 6:00 am-2:30 pm
Saturday: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Babylon

500 W Main St,

Suite 202-203

Babylon, NY 11702

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13.24 mi away

Schedule Appointment 516-677-7718
Monday: 6:30 am-3:00 pm
Tuesday: 6:30 am-3:00 pm
Wednesday: 6:30 am-3:00 pm
Thursday: 6:30 am-3:00 pm
Friday: 6:30 am-3:00 pm
Saturday: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - East Patchogue

285 Sills Rd,

Bldg 8 Ste A

East Patchogue, NY 11772

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13.52 mi away

Schedule Appointment 516-677-7728
Monday: 6:00 am-2:00 pm
Tuesday: 6:00 am-2:00 pm
Wednesday: 6:00 am-2:00 pm
Thursday: 6:00 am-2:00 pm
Friday: 6:00 am-2:00 pm
Saturday: 8:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Plainview

146A Manetto Hill Rd,

Ste101

Plainview, NY 11803

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14.73 mi away

Schedule Appointment 516-677-7713
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Syosset

269 Jericho Tpke,

Syosset, NY 11791

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15.92 mi away

Schedule Appointment 516-677-5355
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Bethpage

4276 Hempstead Tpke,

Bethpage, NY 11714

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16.73 mi away

Schedule Appointment 516-677-7701
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Seaford

850 Hicksville Rd,

Ste 114

Seaford, NY 11783

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17.62 mi away

Schedule Appointment 516-677-7716
Monday: 6:00 am-2:30 pm
Tuesday: 6:00 am-2:30 pm
Wednesday: 6:00 am-2:30 pm
Thursday: 6:00 am-2:30 pm
Friday: 6:00 am-2:30 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Massapequa Park

4900 Merrick Rd,

2Nd Fl

Massapequa Park, NY 11762

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18.21 mi away

Schedule Appointment 516-677-7736
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: 6:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Fairfield Post Road - Employer Drug Testing Not Offered

1305 Post Rd,

Ste 101

Fairfield, CT 06824

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20.14 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 - Norwalk 148 East Avenue - Employer Drug Testing Not Offered

148 East Ave,

Norwalk, CT 06851

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20.67 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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20.82 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 - Wading River

6144 Route 25A,

Ste 8 Bldg B

Wading River, NY 11792

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21.0 mi away

Schedule Appointment 516-677-7733
Monday: 6:30 am-3:00 pm
Tuesday: 6:30 am-3:00 pm
Wednesday: 6:30 am-3:00 pm
Thursday: 6:30 am-3:00 pm
Friday: 6:30 am-3:00 pm
Saturday: 8:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Norwalk Cross Street - Employer Drug Testing Not Offered

40 Cross St,

Ste 260

Norwalk, CT 06851

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21.45 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 - Prado Norte Lomas de Chapultepec

Av Prado Norte 530,

Lomas De Chapultepec

Mexico City, Mexico, 11000

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21.83 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.