Skip to main content
Guidance

Diagnostic radiology: national diagnostic reference levels

Details of the national diagnostic reference levels (NDRLs), for clinicians using radiation in medicine.

Updates to this page

From:
UK Health Security Agency
Published:
22 January 2016
Last updated:
11 December 2025
Show all updates

  1. National DRLs for radiotherapy verification with Cone Beam CT have been published.

  2. NDRLs for general radiography, and fluoroscopy and interventional radiography have been updated.

  3. Added 'National Diagnostic Reference Levels (NDRLs) from 20 November 2024'.

  4. Added process to generate, adopt and maintain NDRLs.

  5. Updated with latest mammography and adult CT NDRLs. Year of publication also added to each NDRL value.

  6. Updated with latest update, including change to '2b. Paediatric CT examinations'.

  7. Added information on new NDRLs for dental radiography, and provided archive links to previous NDRLs.

  8. Added new data for NDRLs.

  9. First published.

Documents

National Diagnostic Reference Levels (NDRLs) from 11 December 2025

HTML

National Diagnostic Reference Levels (NDRLs): process to generate, adopt and maintain

HTML

Details

These tables give the national diagnostic reference levels for common X-ray examinations for patients.

NDRLs from previous years are also available:

Sign up for emails or print this page

Related content