Reasons for Drug Testing

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We perform millions of drug tests annually as a leading drug testing provider. Learn more about the most common reasons for testing, including pre-employment and random.

Products and Services

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We offer a broad range of drug screening options that allow you to combine and customize your program to meet your unique business needs, all from a single, convenient provider.

Online Solutions

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By choosing Quest Diagnostics as your drug testing company, you will gain all of the advantages of proven technology, coupled with exceptional service and personal support.

Knowledge Center


We provide you with a variety of drug testing resources, tools and information to help you create the best program.
Our Resources

We're There When You Need Us™

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We're more than just your drug testing laboratory. Learn more about our mission and the passion for  service.
Our Philosophy