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Overview
Using the Any SNOMED CT subsets for , used to code COVID-19 data coding is dependent on a range of factors related to the local requirements and context of usage. Overall, the following three steps are important when planning and preparing the use of these subsets. In the following sections, we will provide information on each of these steps.
Identify Data Elements
, should be designed based on the context in which they will be used, and other specific usage requirements.
To make the process of planning and designing your SNOMED CT subsets more efficient and internationally consistent, we recommend the following three steps.
These three steps are explained in more detail below.
Step 1 - Identify Data Elements
The first step is to identify the data elements that may require SNOMED CT coding. These data elements may already be defined in national reporting requirements Footnote ref
, or you may be developing a new information model (or data set) for a new purpose. Your requirements for coded content will depend on your specific use case and the data items in your information model. In additionAlthough the recording and use of COVID-19 data revolve around the same clinical scope, the requirements for content depends on the specific use case and the involved data items. Furthermore, different countries, regions, and hospitals may apply different clinical techniques or practices, which can also result in differing coding requirements for content. Therefore Therefore, deciding which subsets to implement require you to clarify requires clarification of the scope of the content requiredneeded, by answering questions such as:Footnote ref n 2
- What will the your SNOMED CT subsets be used for?
- Will it they be used to capture new data in a clinical information system to support frontline service delivery?
- Will it they be used for disease surveillance?
- Will it they be used to integrate data from various sources?
- Will they be used for international collaboration?
- Will it they be used for retrospective analysis of data?
- Which data elements are required for the your use case?
- For data capture, what What coded data needs to be collected to support the clinical processcare?
- For disease surveillance, what parameters are required to monitor the disease progression?
- For data integration, what data items will be shared or communicated?
- For retrospective analysis of data, what are the available data items that are relevant to include for SNOMED CT analytics?
- What coded data needs to be collected to provide disease surveillance?
- What coded data needs to be shared between or integrated from different sources?
- What coded data is required for international collaboration?
- What coded data may be needed for retrospective data analysis?
- What existing subsets are available for the data elements of interest?
- Where these subsets designed based on the same or compatible requirements
- Are the subset members adequate for our needs?
Answering these questions will help in understanding which of the available existing subsets are relevant for your context, and it will also bring attention to . It may also help to identify potential content gaps in the subsets, or extraneous concepts which may be unnecessary for the are not required for your specific scenario. Please note that the questions above are provided for inspiration , and there only. Additional questions specific to your use case are likely to be additional questions to answer specific to your contextneeded.
Step 2 - Download Subsets
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Subset Categories
The SNOMED CT COVID-19 subsets have been developed as a collection of concepts contributed from a range of Members that are considered to be potentially relevant to COVID-19 data coding. The subsets have been organized into the following 5 categories, determined by the data items which are likely to be recorded together.
Patient Demographics (PAT)
Clinical Assessment (ASS)
Tests and Investigations (INV)
Please follow the links in the lists above for detailed information on the specific subsets within each category.
Reference Set Tool
The second step is to download any available existing subsets that are associated with your required data elements.
The international The SNOMED CT COVID-19 subsets are made available via the SNOMED International's Reference set and translation tool , which can be accessed via this link:- https://refset.ihtsdotools.org/.
The These subsets are have been placed in the 'COVID-19 subsets' project and are named according to the naming convention which is presented below.
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The IHTSDO Reference Set Management and Translation Tool provides a directory of existing published content reference sets and translations, currently against the SNOMED CT International Edition. If you would like to request an account to create your own reference sets or translations, please contact techsupport@ihtsdo.org. |
Subset Types
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| GlosTerm | intensional subset definition |
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Subset
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For the subsets that have been extensionally defined, we provide two versions:
- One version which only includes the members listed
- One version which includes the members listed, and the descendants of each of these members. This version supports the collection of more specific values where these are available.
Naming Convention
The reference sets international subsets provided by SNOMED International have been named using a naming convention which follows the general categories of subsetsthe following convention.
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Please see the examples of subset naming in the table below.The table below shows some examples of subsets named using this convention.
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| Category | Subset | Name |
| Provider and Facility Details (PRF) | Site of Care subset | CV19-PRF-SiteOfCare |
Patient Demographics (PAT) | Marital status subset | CV19-PAT-MaritalStatus |
| Marital status subset including subtypes | CV19-ASS-MaritalStatus-withSubtypes | |
Clinical Assessment (ASS) | Symptoms subset | CV19-ASS-Symptoms |
| Symptoms subset including subtypes | CV19-ASS-Symptoms-withSubtypes | |
Tests and Investigations (INV) | Specimen subset | CV19-INV-Specimen |
| Specimen subset including subtypes | CV19-INV-Specimen-withSubtypes | |
| Prevention, Treatment, and Education (PTE) | Prevention procedures subset | CV19-PTE-PreventionProcedures |
| Prevention procedures subset including subtypes | CV19-PTE-PreventionProcedures-withSubtypes |
Review and Adapt
Subset Categories
The international SNOMED CT subsets have been organized into a number of categories, based on groupings of data elements that are likely to be recorded together. The six categories identified are:
Patient Demographics (PAT)
Clinical Assessment (ASS)
Tests and Investigations (INV)
Please follow the links above for information on the specific subsets within each category.
Subset Types
Some of the international subsets have been developed
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For each extensionally-defined subset, where the members have subtypes, we provide two versions:
- One version which includes only the listed members
- One version which includes the members listed and the subtypes of each of these members. This version supports the collection of more specific values where these are available.
Step 3 - Review and Adapt
The third step is to carefully review each international subset, and adapt it to meet your specific requirements. The subsets provided represent a collection of concepts that have been Prior to deployment, the subsets should be carefully reviewed and adapted to meet national or local requirements. As the subsets represent collections of concepts contributed from a range of SNOMED International Members, it . It is therefore important to review the each subset members to identify member to:
- Identify any concepts that are not required for your use case;
- Identify any concepts missing from the subset that may be required for your specific use case.
Please ensure that any concepts included in your subsets are available useful to the local concepts, and potentially identify meanings that are missing from the set, and should thus be added.Additionally, it is important to ensure that the concepts included in the subsets are contained in the SNOMED CT Edition which the system uses. Checking this involves reviewing that is implemented in your system. This may involve:
- Reviewing the effective time of
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- each international concept (shown in the subset tables) to ensure that it is less than or equal to the International Version used in your local system.
- Checking that any extension concepts included are published within the SNOMED CT edition you are using.
Unpublished Content
Please note that the subsets in this guide may include unpublished content, that content (e.g. planned for the July 2020 International Edition). This content should not be used until it has been published. An example of such member is the concept
in the CV19-ASS-Complications subset. This concept will be added officially published. Concepts that are currently planned to be published in the July 2020 version of the International Edition . Although they are not yet available in the downloadable version of the subset, they are referenced in the subset tables of this guide to bring the upcoming additions to your attention and have been included in this guide to assist with planning.Concept t 882784691000119100 | Pneumonia caused by severe acute respiratory syndrome coronavirus 2 (disorder) |
Extension Content
In response to an immediate need for COVID-19-specific concepts, various Member countries have developed concepts within their national SNOMED CT Extensions. These extension concepts are documented in this guide and may be used as an inspiration to other Members. All though, please note that the extension concepts for COVID-19 are not included in the International Edition, and any implementers must only use the extension concepts available within the Edition they deploy. The extension concepts are not available in Please note, however, that extension concepts should only be used when the module in which they are published is included in the implemented SNOMED CT Edition. SNOMED CT extension concepts are not included in the subsets available via the Reference Set tool.
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