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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 - Merced G Street - Employer Drug Testing Not Offered

3377 G Street,

Ste A

Merced, CA 95340

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4.4 mi away

Schedule Appointment 209-388-1046
Monday: 5:30 am-4:30 pm
Tuesday: 5:30 am-4:30 pm
Wednesday: 5:30 am-4:30 pm
Thursday: 5:30 am-4:30 pm
Friday: 5:30 am-4:30 pm
Saturday: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Employer Drug Screens Not Offered - Atwater Commerce Ave

1271 Commerce Ave,

Shops 5

Atwater, CA 95301

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5.31 mi away

Schedule Appointment 209-628-7860
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: Closed
Sunday: Closed
Quest Diagnostics - Merced West Childs Avenue - Employer Drug Testing Not Offered

857 W Childs Ave,

Merced, CA 95341

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6.12 mi away

Schedule Appointment 209-725-0658
Monday: 7:30 am-4:00 pm
Tuesday: 7:30 am-4:00 pm
Wednesday: 7:30 am-4:00 pm
Thursday: 7:30 am-4:00 pm
Friday: 7:30 am-4:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Merced East 13th - Employer Drug Testing Not Offered

240 East 13th Street,

Suite A

Merced, CA 95340

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6.21 mi away

Schedule Appointment 209-383-3531
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: Closed
Sunday: Closed
Quest Diagnostics - Turlock East Hawkeye Avenue

777 E Hawkeye Ave,

Ste 1

Turlock, CA 95380

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19.2 mi away

Schedule Appointment 209-202-9175
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 - Turlock East Tuolumne - Employer Drug Testing Not Offered

981 East Tuolumne Road,

Suite 100

Turlock, CA 95382

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19.34 mi away

Schedule Appointment 209-202-9569
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: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Chowchilla Trinity Avenue - Employer Drug Testing Not Offered

341 Trinity Ave,

Chowchilla, CA 93610

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22.36 mi away

Schedule Appointment 559-665-7286
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: Closed
Sunday: Closed
Quest Diagnostics - Ceres East Whitmore Avenue

2531 E Whitmore Ave,

Ste P

Ceres, CA 95307

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27.32 mi away

Schedule Appointment 209-581-0155
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-11:00 am
Sunday: Closed
Quest Diagnostics - Employer Drug Screens Not Offered - Los Banos West I Street

730 W I St,

Los Banos, CA 93635

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28.1 mi away

Schedule Appointment 209-827-3628
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: Closed
Sunday: Closed
Quest Diagnostics - Mariposa Highway 49

5300 Highway 49 N,

Mariposa, CA 95338

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29.98 mi away

Schedule Appointment 209-966-2529
Monday: 7:00 am-11:30 am , 12:30 pm-4:00 pm
Tuesday: 7:00 am-11:30 am , 12:30 pm-4:00 pm
Wednesday: 7:00 am-11:30 am , 12:30 pm-4:00 pm
Thursday: 7:00 am-11:30 am , 12:30 pm-4:00 pm
Friday: 7:00 am-11:30 am , 12:30 pm-4:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Modesto E Orangeburg Ave

2222 E Orangeburg Ave,

Suite 104

Modesto, CA 95355

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30.46 mi away

Schedule Appointment 888-277-8772
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 - Modesto 6th Street

1008 6th Street,

Suite C

Modesto, CA 95354

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31.37 mi away

Schedule Appointment 209-569-0379
Monday: 6:30 am-2:30 pm
Tuesday: 6:30 am-2:30 pm
Wednesday: 6:30 am-2:30 pm
Thursday: 6:30 am-2:30 pm
Friday: 6:30 am-2:30 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Oakdale South Oak Avenue

250 S. Oak Ave,

Bldg C, Ste 2

Oakdale, CA 95361

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32.05 mi away

Schedule Appointment 209-845-2911
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 - Modesto McHenry Avenue - Employer Drug Testing Not Offered

1524 Mchenry Ave,

Ste 120

Modesto, CA 95350

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32.07 mi away

Schedule Appointment 209-575-4559
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: 6:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Patterson Sperry

1045 Sperry Ave,

Ste D

Patterson, CA 95363

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33.5 mi away

Schedule Appointment 209-202-9293
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: Closed
Sunday: Closed
Quest Diagnostics - Modesto Pelandale Ave

3525 Pelandale Ave,

Modesto, CA 95356

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36.32 mi away

Schedule Appointment 209-222-1754
Monday: 7:30 am-11:30 am , 12:30 pm-4:00 pm
Tuesday: 7:30 am-11:30 am , 12:30 pm-4:00 pm
Wednesday: 7:30 am-11:30 am , 12:30 pm-4:00 pm
Thursday: 7:30 am-11:30 am , 12:30 pm-4:00 pm
Friday: 7:30 am-11:30 am , 12:30 pm-4:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Madera East Almond Avenue

363 East Almond Avenue,

Suite 107

Madera, CA 93637

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38.7 mi away

Schedule Appointment 559-662-8993
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: Closed
Sunday: Closed
Quest Diagnostics - Sonora Crossroads

1031 Sanguinetti Rd,

Ste B

Sonora, CA 95370

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42.22 mi away

Schedule Appointment 209-630-0257
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: Closed
Sunday: Closed
Quest Diagnostics - Oakhurst Victoria

48677 Victoria Ln,

Oakhurst, CA 93644

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45.81 mi away

Schedule Appointment 559-683-0909
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 - Manteca East Commerce Avenue

293 East Commerce Ave,

Manteca, CA 95336

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45.97 mi away

Schedule Appointment 209-823-2560
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: 6:30 am-10:30 am
Sunday: Closed
Quest Diagnostics - Manteca Norman Drive - Employer Drug Testing Not Offered

1140 Norman Dr,

Ste 2

Manteca, CA 95336

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46.13 mi away

Schedule Appointment 209-825-4158
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

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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. © 2025 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only.