Quest Diagnostics

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160 Middle Rd
Sayville, NY 11782
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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1.512 reviews
Fausto Pete M.
1/11/2024

Quest diagnostics app and on line service is horrible . 5 times and 1 1:2 hrs later I still couldn't sign in to my account to make appointment . On different days , I encountered the same...

Christine K.
9/20/2025

I went to the Sayville office. The technician who took my blood was unfriendly to the point of rudeness. She didn't greet me, introduce herself or show any courtesy. She remained expressionless...

Dan O.
9/17/2024

Terrible, dirty, dilapidated and vicious. There was a problem with the way my Dr. submitted the paperwork for insurance. The incredibly rude tech got more and more visibly annoyed as she had to...

Tymiek M.
8/19/2024

Came for a military drug screening. The place is dirty and smells horrible. The customer service is very bad and you won't be treated like a priority. This business lacks professionalism and this...

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Vicki A.
12/22/2023

This is a terribly run Quest office. It's dirty, old and smells like mothballs. I've had issues MULTIPLE times with the same rude phlebotomist. She's lazy and has no clue how to speak to...

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