Compare historical versions of a SNOMED CT concept

In this page:

Compare detailed information for two concepts using the SCT Browser's Comparing Perspective.

Prerequisite steps: Browse SNOMED CT International Edition concepts or Find the SCTID for a known concept term or Find the FSN or PT for a known concept SCTID

Steps	References

Steps	References
With the desired focus concept in the Concept Details panel, press on the `Perspective` button in the header bar to see a drop-down options list of available perspectives: `Full` `Comparing` `Comparing hierarchy` `Responsive (tablets, phones)`
Select `Comparing` to switch the presentation to `Perspective: Comparing`.
`Perspective: Comparing` maintains the browser header bar, but changes to show two side-by-side Concept Details panels, with a full-width Search panel below them. When invoked with a concept already in the `Perspective: Full` Concept Details panel, the focus concept will be preserved in both `Perspective: Comparing` Concept Details panels. Panel sizes can be adjusted The relative sizes of the three panels can be adjusted by pressing and dragging their grey border bars. When comparing historical versions it is useful to reduce the Search panel height once concepts are loaded for comparison, as shown in the adjacent screenshot. Reloading clears Perspective: Comparing Reloading the page will reset the SCT Browser to the `Perspective: Full` default presentation.
With the same focus concept in each Concept Details panel, use their `History` context tab to change their content to a historical version, as described in View the history of a SNOMED CT concept.
The two Concept Details context tabs can now be used to independently select alternative versions from the concept history, so that they can be compared side-by-side.
Once done with comparisons, select `Full` in the header bar `Perspective` button drop-down options list to switch back to `Perspective: Full`.
The comparison focus concept will be retained in the `Perspective: Full` Concept Details panel, however it will be reset to the latest published version.