DRAFT FOR COMMUNITY REVIEW
The policies and principles used to develop the mapping from EDQM to SNOMED CT pharmaceutical dose forms are described below.
Aims and Objectives
To produce as close as possible to a 1..1 exact semantic match mapping between the EDQM Pharmaceutical Dose Forms as source and the SNOMED CT descendants of 736542009 | Pharmaceutical dose form (dose form) | to support the use cases described above.
When an exact match is not possible, further discussions will be undertaken with the relevant parties and guidance will be offered to users of the map.
Scope
Map source: EDQM Pharmaceutical Dose Forms
Active PDFs at 2021-09-07 that are not ‘Veterinary only’
A "snapshot" full download of EDQM PDF data was taken via the EDQM API
Add table of excluded EDQM dose forms.
Map target: SNOMED CT 20210731 international edition
Active concepts that are < 736542009 | Pharmaceutical dose form (dose form) |
Definition of a pharmaceutical dose form: “the physical manifestation of a Medicinal Product that contains the active ingredient(s) and/or inactive ingredient(s) that are intended to be delivered to the patient”
Based on the use cases, PDFs that have been inactivated in EDQM may still be used in product SmPCs; these will require a historical association to an active PDF. This should be considered once the initial scope has been completed
Patient Friendly Terms (PFT) are currently excluded; these may be used in product labelling but are not used as a definitional attribute for a medicinal product.
Authorised dose forms (those that may be used in section 3 of an SmPC in Europe) include Combined Pharmaceutical Dose Forms, Combined Terms and Combination Pack concepts as well as PDFs. In order to fulfil use case 1, these concepts may require addition to SNOMED CT but currently they are out of scope.
We are not mapping the EDQM and SNOMED CT dose form attribute values, because for EDQM, these are not definitional so might give us misleading results if we then tried to do an "automatic" map based on these. However, we are noting when the attribute values between two concepts that give an exact map based on their definition do not have an exact attribute value map.
Cardinality
The aim is to get 1..1 semantic maps wherever possible and to provide guidance in all situations where that is not the case.
Association/Correlation
The aim is for the source and target to be "equivalent" (i.e. an exact semantic match)
But there will be some maps that are not exact, but which we wish to make and to note that they have a different association.
Narrower (than): Use this association when the meaning of the SNOMED CT concept is narrower than the meaning of the EDQM concept
- Another way of saying this is that this is a "broad-to-narrow" map (from EDQM source to S-CT target); this is a 'narrower' mapping, because you're mapping to a narrower meaning
For example, a mapping between "Intravesical solution/solution for injection" in EDQM to "Conventional release intravesical solution" in S-CT is "narrower" as the EDQM concept appears to suggest two quite different methods of administration are possible, whereas the S-CT concept is specifically a solution - Some 'Narrower target' maps may be made, in situations where the EDQM concept is inappropriate for inclusion in SNOMED CT but alternative more granular concepts are available. These may give a 1..* cardinality.
Broader (than): Use this association when the meaning of the SNOMED CT concept is broader than the meaning of the EDQM concept
- Another way of saying this is that this is a "narrow-to-broad" map (from EDQM source to S-CT target); this is a 'broader' mapping, because you're mapping to a broader meaning
For example, a mapping between "Capsule, soft" in EDQM to "Conventional release oral capsule" in S-CT is "broader" as the S-CT concept encompasses both hard and soft capsule types - Some 'Broader target’ maps may be made; these are likely to give a *..1 cardinality when the mapping is considered in its entirety
In all cases where the final mapping is 'Broader target’ or 'Narrower target', implementation guidance will be provided.
Principles
Mapping to a Semantic Match
The map was developed, based on the principle that the source and target codes of 'equivalent' maps must be an exact semantic match.
For more information on the semantic representation of codes in the source and target terminologies please refer to 3.1 Comparison of Dose Form Semantics.
Transform Dose Forms
As a general principle. if there is a PDF that undergoes a transform to another PDF (e.g. "Powder for intravesical solution") whose transformed dose form (the administrable dose form) would be "Intravesical solution", the transformed PDF concept should be available in SNOMED CT International content even if there are no CDs that directly require it. Some extensions may model "administrable CDs" or equivalent concepts and require the administrable dose form.
Please Add Other Principles Here
Feedback
Overview
Content Tools
Apps