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SNOMED CT derivative products

SNOMED CT UK Query Table and History Substitution Table

Releases of this item contain 2 related derivatives of the SNOMED CT UK Edition to aid the processing of inactive content within systems and data repositories.

The History Substitution Table provides a single table identifying valid substitutions for concepts that are now inactive, along with metadata about that substitution; it is computed using the historical relationships within the main SNOMED CT release but presented as a simpler look-up table.

The Query Table is an extension to a normal SNOMED CT transitive closure table, taking into account the History Substitutions Table and other data. It provides a mechanism to achieve optimal data retrieval, regardless of inactive and active concept status in data or query definitions. The Query Table is recommended as a mechanism for ensuring inactive content is still returned in searches, and is specifically recommended by the Joint GP IT Committee for use in primary care systems.

Status: Supported


  • Licences (2)

Releases of this item

SCT_QTHS_31.3.0_20210120000001

Release 31.3.0, 27 January 2021.


Released on Wednesday, 27 January 2021

SCT_QTHS_31.1.0_20201125000001

Release 31.1.0, 25 November 2020.


Released on Wednesday, 2 December 2020

SCT_QTHS_31.0.0_20201028000001

Release 31.0.0, 28 October 2020.


Released on Wednesday, 11 November 2020

SCT_QTHS_30.2.0_20200930000001

Release 30.2.0, September 2020.


Released on Wednesday, 7 October 2020

SCT_QTHS_30.0.0_20200805000001

Release 30.0.0, August 2020.


Released on Wednesday, 5 August 2020

SCT_QTHS_29.3.0_20200610000001

Release 29.3.0, June 2020.


Released on Wednesday, 17 June 2020

SCT_QTHS_29.2.0_20200513000001

Release 29.2.0, May 2020.


Released on Wednesday, 13 May 2020

SCT_QTHS_29.1.0_20200415000001

Release 29.1.0, 22 April 2020.


Released on Wednesday, 15 April 2020

SCT_QTHS_29.0.0_20200401000001

Release 29.0.0, April 2020.


Released on Wednesday, 1 April 2020

SCT_QTHS_28.0.0_20191001000001

Release 28.0.0, October 2019.


Released on Tuesday, 1 October 2019

SCT_QTHS_27.0.0_20190601000001

Release 27.0.0, June 2019.


Released on Tuesday, 4 June 2019

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