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Chlamydia Testing Activity Dataset (CTAD) collects data on all chlamydia tests undertaken in England from NHS laboratories and LA/NHS commissioned laboratories, to measure screening activity.

CTAD became mandatory in April 2012 (as a national NHS Information Standard, ISB 1528) superseding the National Chlamydia Screening Programme (NCSP) and the non-NCSP non-GUM (NNNG) data sources of primary care and community service chlamydia data.

This guidance was updated in January 2015 to reflect amendments to CTAD authorised by the , and aim to support and improve CTAD data quality and completeness.