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Due to Hurricane Isaias, our Patient Service Centers in affected areas may be closed. We ask that patients please double check your appointment status to ensure your designated Patient Service Center is operational. For site-specific information, please use Find a location and enter your zip code.

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Quest Diagnostics

West Hills

8401 Fallbrook Ave

West Hills

91304

CA

United States

34.222969

-118.623589

(866) 697-8378

Monday: Open 24 hours

Tuesday: Open 24 hours

Wednesday: Open 24 hours

Thursday: Open 24 hours

Friday: Open 24 hours

Saturday: Open 24 hours

Sunday: Open 24 hours

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. May include AI-generated and/or AI-modified imagery.