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Quest Diagnostics helps you protect your practice and your patients with state-of-the-art testing, including a broad range of drug tests to meet medical necessity needs to identify the presence of prescribed and non-prescribed or illicit drugs.

State-of-the-art technologies and 650 toxicology and medical experts—a powerful combination

With fast turnaround, accurate results confirmation, an industry-leading testing portfolio, and an array of on-staff toxicologists and medical experts, Quest Diagnostics provides the most trusted and reliable drug monitoring services available today.

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Helping you stay current in drug monitoring

Full-Spectrum CBD May Trigger Positive THC Result

Use of so-called “full-spectrum” formulations of cannabidiol (CBD) products can cause users to test positive for THC, the component of marijuana that causes euphoria, according to an open-label study published in JAMA Psychiatry.

Quest Diagnostics Clinical Drug Monitoring

Diverse Testing for Diverse Needs

State-of-the-art technologies and 650 toxicology and medical experts—a powerful combination

Helping you stay current in drug monitoring

Jeff Gudin, MD

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Drug toxicology consultation for healthcare providers

Diverse Testing for Diverse Needs

State-of-the-art technologies and 650 toxicology and medical experts—a powerful combination

Helping you stay current in drug monitoring

Industry-leading expertise from Quest Diagnostics

Jeff Gudin, MD

Test Directory

Resource Center

Patient Information

Drug toxicology consultation for healthcare providers