Quest Diagnostics is a top healthcare company based in the United States, known for its diagnostic testing, information, and services. The company has a medium risk ESG score of 20.3. With a focus on clinical testing, anatomic pathology, esoteric testing, and substance abuse testing, Quest Diagnostics operates a vast network of 2,300 patient service centers, along with partnerships with doctors offices and hospitals. Additionally, they offer clinical trials testing, risk assessment services, and information technology solutions through a smaller diagnostic solutions segment.