Collaborative Testing Services, Inc.   anniversary
P.O. Box 650820, Sterling, VA, USA 20165-0820  1-571-434-1925
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The first and still the largest forensic proficiency test provider, CTS has set the benchmark for forensic tests since 1978. Our ever-growing catalogue of tests reflects the responsive and innovative nature of our organization, as well as our involvement in and dedication to the forensic community. Organizations around the world turn to CTS each year to meet their proficiency testing needs. Check out our more than 70 tests offered across 10 disciplines:

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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:

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