Guidance
Diagnostic radiology: national diagnostic reference levels
Details of the national diagnostic reference levels (NDRLs), for clinicians using radiation in medicine.
- From:
- UK Health Security Agency
- Published
- 22 January 2016
- Last updated
-
208NovemberJuly20242025 — See all updates
Documents
Details
These tables give the national diagnostic reference levels for common X-ray examinations for patients.
NDRLs from previous years are also available:
Details
These tables give the national diagnostic reference levels for common X-ray examinations for patients.
NDRLs from previous years are also available:
Updates to this page
Published 22 January 2016
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Update history
2025-07-08 09:30
NDRLs for general radiography, and fluoroscopy and interventional radiography have been updated.
2024-11-20 09:14
Added ‘National Diagnostic Reference Levels (NDRLs) from 20 November 2024’.
2022-11-24 13:11
Added process to generate, adopt and maintain NDRLs.
2022-10-13 16:14
Updated with latest mammography and adult CT NDRLs. Year of publication also added to each NDRL value.
2022-06-14 16:58
Updated with latest update, including change to ‘2b. Paediatric CT examinations’.