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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