Contact CLSI: Get in Touch with Us Today

We’d be happy to speak with you more about our products, programs, membership, and mission.

CLSI Address

Clinical and Laboratory Standards Institute
950 West Valley Road, Suite 2500
Wayne, PA 19087 USA

Phone Numbers

P: +1.610.688.0100
F: +1.610.688.0700
Toll Free (US): 877.447.1888
Customer Service phone hours
8:30 AM–5:00 PM Eastern (US) Time

E-mail Us


Customer Service, Orders, and General Questions

Web Assistance

Technical Questions

If you have technical questions regarding the content of CLSI standards and guidelines, please e-mail