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Collaborative Testing Services, Inc.

P.O. Box 650820, Sterling, VA, USA 20165-0820  1-571-434-1925
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Quality buzzwords may come and go, but one thing has remained the same since 1971: CTS' unwavering commitment to assisting laboratories in meeting their quality assurance objectives. Find out how our interlaboratory and proficiency tests can help you achieve better measurements, better control, and better laboratory performance. We offer testing programs for:

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You are a click away from the most comprehensive client portal offered by a proficiency test provider. The CTS Customer Portal opens the door to...

Testing Instructions
Data Management
(including data entry, revisions, history)
Reports
Guides to Interpreting Reports
Order History
Test Delivery
(for digital download tests)