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
PO Box 334
Malvern, PA 19355

Office Address

Global Headquarters
Clinical and Laboratory Standards Institute
1055 Westlakes Drive, Suite 300
Berwyn, PA 19312

Dubai Office
Clinical and Laboratory Standards Institute MENA
Office Suite # 902, Level 9, Dubai World Trade Center,
P.O.Box 124752, Dubai, United Arab Emirates

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

Phone: +1.610.688.0100
Fax: +1.610.688.0700
Toll Free (US): 877.447.1888
Middle East & Africa: +971 4 311 6357

Customer Service phone hours
8:30 AM–5:00 PM Eastern (US) Time

CLSI MENA
Phone: +971 4 311 6357
Toll Free (US): 877.447.1888

MENA office hours
9:00 AM - 5:00 PM UAE Standard Time (GMT+4:00)

E-mail Us

Membership Inquiries: membership@clsi.org

Customer Service, Orders, and General Questions: customerservice@clsi.org

Middle East & Africa Support: mena@clsi.org

Technical Questions

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