Quest Diagnostics

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447 Miller Ave
Mill Valley, CA 94941
The Quest Diagnostics difference. Bringing together quality, speed, and technology to power advanced, affordable diagnostics for all. No trade-offs required.
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Reviews

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2.078 reviews
Matt P.
8/4/2025

They got to me right away but the woman taking my blood was pretty cold and rude - and the place just felt depressing.

Taylor H.
7/23/2025

This Quest location is the worst one I've seen. Completely mismanaged. Makes the DMV look like 5 star service. They will prioritize walk-ins over appointments, and make you miss the time window...

Mary B.
6/16/2025

What happened to our present medical system in which Quest Laboratory is the only one that exists in Marin county? This monopoly has created a mess in which patients must deal with unacceptable...

Scott B.
7/24/2025

Very poor customer service. Snooty. They don't care about patients. I have had multiple poor experiences here. STAY AWAY

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Jessica K.
11/5/2024

If anyone was at Quest on November 4th, 2024 and had to reschedule surgery due to being ill, and or was greatly affected due to being immunocompromised and falling ill, missed work due to illness,...

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