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Contact CLSI: Get in Touch with Us Today

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

Mailing Address

Clinical and Laboratory Standards Institute
P. O. Box 334
Malvern, PA 19355

Office Address

Clinical and Laboratory Standards Institute
5 Great Valley Parkway
Suite 219
Malvern, PA 19355

Please send payments to:

Clinical and Laboratory Standards Institute
PO Box 645766
PITTSBURGH, PA 15264-5255

Please send overnight courier payments to:

PNC Bank C/O Clinical and Laboratory Standards Institute
Lockbox Number 645766
500 1ST AVE
PITTSBURGH, PA 15219

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

Membership

membership@clsi.org

Customer Service, Orders, and General Questions

customerservice@clsi.org

Technical Questions

If you have technical questions regarding the content of CLSI standards and guidelines, please e-mail standard@clsi.org.