The criteria for f or a successful implementation of SNOMED CT includes the customization of SNOMED CT to meet user needs. The order in which SNOMED CT components are displayed is often important for for data entry and searching. This This topic is further explored in the SNOMED CT Search and Data Entry Guide. In general, rational ordering of selectable items depends on the nature of the application and its operating environment. The table below shows examples of ordering data entry items and search results rationally.
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CapId | examples-of-rational-ordering |
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Examples of rational ordering |
Approach | Description | Example Uses | Reference Set |
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Sequential ordering | Annotating each subset member with an integer, which specify the consecutive order of the members. Two subset members do not have the same number assigned to them. | Displaying descriptions sequentially according to their specified order. | Ordered component reference set |
Prioritization | Showing descriptions associated with high priority concepts before those associated with a lower priority. | | Ordered reference set | PrioritizationAnnotating each subset member with a an integer, which specify a priority order. Two or more subset members may have the same number assigned to them. |
| Showing concepts with a high priority before their siblings using hierarchical display results. - Display search results in priority order
- Results with same rank ordered by shortest or closest match
- Displaying a rank indicator in search result list
Association | Ordered component reference set
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Initially listing concepts and associated descriptions with a priority above a specified threshold and requiring additional steps to access those assigned a lower priority. - Initial search is conducted on components with highest priority
- Allow search to be extended to lower priorities
- If no high priority matches
- If user requests more matches
| Ordered reference set |
Sequential Ordering
An example of displaying Displaying items for data entry rationally is organizing list items in a rational way typically involves organizing the values in a selection list in an order which that is logical for the end users. If subsets of SNOMED CT concepts or descriptions are displayed during the process of data entry an 5.3. Ordered Reference Set As illustrated in the figure below, an ordered reference set can be used to specify the order in which the SNOMED CT components should be displayed, as illustrated in the figure below.
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Example of how an ordered reference set can be used to order items in a drop down list |
Examples of presenting concepts presenting concepts (or descriptions) in an order that is rational or helpful for a particular purpose irrespective of the term displayed, includepurpose include:
- Body parts including Displaying numbered body parts, such as fingers, cranial nerves and or vertebrae, in numeric order
- Displaying ordinal values, such as Enumerated values and scales including frequencies, severities and or stages, from lowest to highest
The table below shows how the order of cranial nerves can be specified in an ordered component reference set. The order attribute is used to indicate the sequential order of each subset member. Note that the linkedToId is set to 0 in this case because this refset does not specify nesting of the refset members
An ordered reference set used to specify the order of cranial nerves
refsetId | referencedComponentId | order |
linkedToId | Scg expression |
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609999999102 | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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ShowParts | id609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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609999999102 Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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| |
scg-expression 0 | Scg expression |
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609999999102 |
Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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609999999102 Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 Scg expression |
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609999999102 |
609999999102 t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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|
609999999102 Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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|
609999999102 |
609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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609999999102 Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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609999999102 Concept |
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t | 609999999102 | Cranial nerve simple reference set | |
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scg-expression Scg expression |
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609999999102 |
0 | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 0 | Scg expression |
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609999999102 | 609999999102 | Cranial nerve simple reference set | |
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scg-expression 12 | 0 | If there is a need to specify |
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Prioritization
Some situations may require a set of refset members subset members to be grouped, for example the set of most commonly used concepts in . For example, a set of concepts may need to be grouped based on how frequently they are used within a particular specialty, department or data entry scenario. In this case, you may want to use the ordered reference set for prioritization instead an ordered association reference set may be used for prioritization, instead of a purely sequential ordering of each member. Prioritization Prioritization is similar to sequential ordering, but also supports assigning the same rank to multiple components. A common use of prioritization is to support rational ordering of concepts or descriptions for display of data entry items and search results. More advanced uses may also be required, for example where the priority order is used to trigger certain decision support features or data entry options.
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Illustration of how rational display of data entry options can be supported by specifying a priority order of the refset members.
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CapId | using-a-priority-order-to-display-data-entry-options |
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Using a priority order to display data entry options |