Drug screening

Quest Diagnostics


Reasons for drug testing

Drug testing lab group of 5
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, random, and DOT.

Products and services

Lab technician pipettes in the drug testing lab
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

Woman on laptop using drug testing portal

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

The real costs of drug testing

Drug testing calculator

Every company and every industry have different costs and different risks. Get an accurate picture of your ROI with the new Savings Calculator.
Estimate your savings