National Drug Extension Model

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Clinical drug concepts in the international edition are authored either using presentation strength (for discrete dose forms) or using concentration strength (for liquid dose forms and patches etc.) as appropriate for different types of product (see Appendix A of the international specification).  Concentration strength in SNOMED CT is where the description of the strength of a clinical drug has been normalised such that the denominator value is "one" and the denominator unit is a unit of mass (e.g. grams) or volume (e.g. milllilitres).  Presentation strength is a description of the strength of the clinical drug as it is present its unit of presentation

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(vial, ampoule, sachet).  In national extensions the concentration strength clinical drug may be sufficient, or there may be a requirement to represent some, usually liquid dose form product clinical drugs, using both concentration and presentation strength either for the abstract clinical drug or for the real clinical drug, or for both. This is shown in the diagram below:

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