Guidance
Chlamydia Testing Activity Dataset (CTAD): specification and technical guidance
Guidance and specifications for the recording and extraction of CTAD data from laboratories in England processing local authority and NHS commissioned chlamydia tests.
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CTAD collects data on all chlamydia tests undertaken in England from local authority and NHS commissioned laboratories, to measure screening activity.
This guidance is an overview of the CTAD dataset specification. The information helps staff in laboratories, service providers and service commissioners.
Updates to this page
Published 1 January 2003
Last updated 6 August 2026
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Updated guidance.
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First published.