National Chlamydia Screening Programme (NCSP)

Information, data, guidance and resources about the NCSP.

Chlamydia is the most common bacterial sexually transmitted infection, with sexually active young people at highest risk. As chlamydia often has no symptoms and can have serious health consequences (such as pelvic inflammatory disease, ectopic pregnancy and tubul factor infertility) opportunistic screening remains an essential element of good quality sexual health services for young adults.

Further information on chlamydia is available on the NHS website.

If you require a test kit, these are provided by your local sexual health services who will also provide you with the test result.

Through searching for local online sexual health services, you may be able to access online test kits if these are available in your area.

If you require a medical or sexual health advice, please contact the National Sexual Health Helpline provided by Public Health England on 0300 123 7123 (Monday to Friday 9am to 8pm, Saturday and Sunday 11am to 4pm).


National chlamydia screening programme (NCSP)

HIV / STI department, Public Health England
61 Colindale Avenue

Programme overview

A substantial proportion of all young adults become infected with chlamydia in a year. The aim of the National Chlamydia Screening Programme (NCSP) is to control chlamydia through early detection and treatment of asymptomatic infection, so reducing onward transmission and the consequences of untreated infection.


Public Health England (PHE) collects data on all chlamydia tests undertaken in England from NHS laboratories, local authorities and NHS commissioned laboratories, to measure screening activity.

Chlamydia activity data reported by PHE are based on primary care and community service chlamydia data from CTAD Chlamydia Surveillance System, and chlamydia data from GUMCAD STI Surveillance System.

Sexual and Reproductive Health Profiles

Public Health Outcome Framework data tool

Chlamydia diagnosis rate indicator: summary of revised rate (June 2013)

Annual chlamydia diagnosis rate: frequently asked questions

PHE: protection of personal information and data

Commissioning and provider guidance

Quality assurance (QA)

The NCSP is committed to supporting the highest possible standards in the commissioning and provision of chlamydia screening. The NCSP Quality Assurance (QA) framework sets out the NCSP strategy for QA.

Past reports are available from the archived NCSP website.

Programme materials

Downloadable versions of the compulsory Patient Information Leaflet and other materials are available to support marketing of the National Chlamydia Screening Programmes (NCSP) locally.

Materials can also be downloaded from the campaign resources page at the NHS Choices Sexual Health Professional website.

Pilots and studies

Collection of information relating to NCSP pilots and studies with results.

Published 1 January 2003
Last updated 26 January 2021 + show all updates
  1. Added details on requiring a test kit and the National Sexual Health Helpline.

  2. Added 'Audit and commissioning sexual health services' document.

  3. Added the ‘NCSP: incidents reporting policy’ under QA.

  4. First published.