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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 - Greenville

4101 Wesley St,

Suite G

Greenville, TX 75401

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15.11 mi away

Schedule Appointment 903-454-4491
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 - Paris

3150 Clarksville Street,

Suite 500

Paris, TX 75460

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32.68 mi away

Schedule Appointment 903-737-2995
Monday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Tuesday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Wednesday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Thursday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Friday: 8:00 am-12:00 pm , 1:00 pm-3:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Inside Rockwall Tom Thumb Store - Employer Drug Testing Not Offered

3070 N Goliad St,

Rockwall, TX 75087

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36.36 mi away

Schedule Appointment 972-722-7797
Monday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Tuesday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Wednesday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Thursday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Friday: 8:00 am-12:00 pm , 1:00 pm-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - McKinney

4510 Medical Center Dr,

Ste 310

McKinney, TX 75069

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38.51 mi away

Schedule Appointment 972-547-0159
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: Closed
Sunday: Closed
Quest Diagnostics - Rockwall

1201 Arista Dr,

Suite 107

Rockwall, TX 75032

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40.31 mi away

Schedule Appointment 972-532-7151
Monday: 8:00 am-5:00 pm
Tuesday: 8:00 am-5:00 pm
Wednesday: 8:00 am-5:00 pm
Thursday: 8:00 am-5:00 pm
Friday: 8:00 am-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Inside Rowlett Tom Thumb Store - Employer Drug Testing Not Offered

8805 Lakeview Pkwy,

Rowlett, TX 75088

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40.5 mi away

Schedule Appointment 214-607-1608
Monday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Tuesday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Wednesday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Thursday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Friday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Murphy

140 East F. M. 544,

Suite 80

Murphy, TX 75094

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40.88 mi away

Schedule Appointment 214-299-6363
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 - Inside Allen Walmart - Employer Drug Testing Not Offered

730 W Exchange Pkwy,

Allen, TX 75013

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41.04 mi away

Schedule Appointment 972-908-9557
Monday: 7:00 am-4:30 pm
Tuesday: 7:00 am-4:30 pm
Wednesday: 7:00 am-4:30 pm
Thursday: 7:00 am-4:30 pm
Friday: 7:00 am-4:30 pm
Saturday: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Inside Allen Tom Thumb Store - Employer Drug Testing Not Offered

900 W Mcdermott Dr,

Allen, TX 75013

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41.93 mi away

Schedule Appointment 972-737-3309
Monday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Tuesday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Wednesday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Thursday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Friday: 8:00 am-12:30 pm , 1:30 pm-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Inside Firewheel Parkway Tom Thumb Store - Employer Drug Testing Not Offered

2535 Firewheel Parkway,

Garland, TX 75040

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43.52 mi away

Schedule Appointment 972-200-9849
Monday: 7:30 am-12:00 pm , 1:00 pm-4:30 pm
Tuesday: 7:30 am-12:00 pm , 1:00 pm-4:30 pm
Wednesday: 7:30 am-12:00 pm , 1:00 pm-4:30 pm
Thursday: 7:30 am-12:00 pm , 1:00 pm-4:30 pm
Friday: 7:30 am-12:00 pm , 1:00 pm-4:30 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Inside Sherman Walmart Store

401 E Us Highway 82,

Sherman, TX 75092

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44.2 mi away

Schedule Appointment 903-813-5625
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: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Inside Garland Tom Thumb Store - Employer Drug Testing Not Offered

2645 Arapaho,

Garland, TX 75044

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45.36 mi away

Schedule Appointment 469-520-0540
Monday: 8:00 am-5:00 pm
Tuesday: 8:00 am-5:00 pm
Wednesday: 8:00 am-5:00 pm
Thursday: 8:00 am-5:00 pm
Friday: 8:00 am-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Inside Prosper Walmart Supercenter

500 Richland Blvd,

Prosper, TX 75078

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46.02 mi away

Schedule Appointment 972-346-1086
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: 7:00 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Inside Plano Tom Thumb Store - Employer Drug Testing Not Offered

3945 Legacy Dr,

Plano, TX 75023

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47.01 mi away

Schedule Appointment 214-227-1372
Monday: 8:00 am-5:00 pm
Tuesday: 8:00 am-5:00 pm
Wednesday: 8:00 am-5:00 pm
Thursday: 8:00 am-5:00 pm
Friday: 8:00 am-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Plano Medical Pavillion

3801 W 15Th St,

Ste 100, Bldg A

Plano, TX 75075

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48.04 mi away

Schedule Appointment 972-612-1887
Monday: 7:30 am-5:00 pm
Tuesday: 7:30 am-5:00 pm
Wednesday: 7:30 am-5:00 pm
Thursday: 7:30 am-5:00 pm
Friday: 7:30 am-5:00 pm
Saturday: 7:30 am-12:00 pm
Sunday: Closed
Quest Diagnostics - Inside Richardson Tom Thumb Store - Employer Drug Testing Not Offered

819 W Arapaho Rd,

Ste 39

Richardson, TX 75080

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49.12 mi away

Schedule Appointment 972-907-1122
Monday: 8:00 am-5:00 pm
Tuesday: 8:00 am-5:00 pm
Wednesday: 8:00 am-5:00 pm
Thursday: 8:00 am-5:00 pm
Friday: 8:00 am-5:00 pm
Saturday: Closed
Sunday: Closed
Quest Diagnostics - Frisco - Employer Drug Testing Not Offered

5575 Warren Pkwy,

Prof. Bldg I, Baylor Medical Center - Ste 303

Frisco, TX 75034

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49.79 mi away

Schedule Appointment 214-618-6470
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: 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.