Labcorp has agreed to acquire Millennium Health, a specialty laboratory focused on drug testing and surveillance, expanding Labcorp’s toxicology capabilities and nationwide access to testing services.
Millennium Health has more than 15 years of experience providing toxicology testing designed to give clinicians insights into patients’ recent use of prescription medications and illicit drugs. Its services are used to support the monitoring and treatment of patients with chronic pain, substance use disorders, mental health conditions, and other healthcare needs.
Following the acquisition, Labcorp plans to combine Millennium Health’s specialized toxicology capabilities and drug surveillance tools with its national laboratory infrastructure, broad testing menu, digital capabilities, and network of patient service centers across the United States.
The companies said the combination is expected to provide Millennium Health customers, clinicians, and patients with greater access to testing while also simplifying areas such as test ordering and delivery of laboratory results.
For Labcorp, the acquisition expands its presence in specialized toxicology testing, an area that can provide healthcare professionals with information needed to monitor medication adherence, identify potential drug interactions or misuse, and make more informed treatment decisions.
Millennium Health’s capabilities are particularly focused on supporting clinicians treating patients affected by chronic pain, substance use disorders, and behavioral health conditions. Labcorp intends to build on the company’s existing expertise while extending its services through Labcorp’s larger national platform.
The transaction is subject to applicable regulatory approvals and customary closing conditions.
The acquisition fits within Labcorp’s broader strategy of expanding specialized diagnostic capabilities that complement its existing laboratory network. Labcorp operates globally and provides diagnostic and drug development laboratory services to physicians, hospitals, pharmaceutical companies, researchers, and patients.
The company employs nearly 71,000 people and operates across approximately 100 countries. Labcorp said it performed more than 750 million patient tests globally and provided support for more than 85% of the new drugs and therapeutic products approved by the U.S. Food and Drug Administration in 2025.
KEY QUOTES:
“By combining Labcorp’s national scale, scientific leadership and digital capabilities with Millennium Health’s specialized toxicology testing capabilities and unique drug surveillance tools, we have an opportunity to make a greater impact on people living with chronic pain, mental health conditions and substance use disorders. We are committed to building upon Millennium’s strong reputation and broadening access to high-quality toxicology services for providers and their patients.”
Andrea Throop, Ph.D., Head Of Toxicology At Labcorp
“I am incredibly proud of what our team has been able to accomplish at Millennium Health and am very excited about what the next chapter holds. We are committed to our mission of helping customers improve patient care and avoid tragedy, and we are excited about how this acquisition by Labcorp will strengthen our ability to fulfill this role in communities across the country.”
Scott Walton, CEO Of Millennium Health
