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In most environments, the recommended approach is to either use a precomputed transitive closure table or a description logic reasoner. However, where disk capacity or distribution bandwidth are limiting factors, branch numbering provides an efficient alternative approach. For more information on these approaches, please refer to Subtype search scope restriction  in the SNOMED CT Terminology Services Guide.

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Where available, the recommended approach is to use a description logic reasoner to calculate subsumption between expressions. However, comparing normal form expressions provides an alternative approach when a reasoner is not available. For more information on these approaches, please refer to Expression Retrieval and Normal Forms in the SNOMED CT Terminology Services Guide.

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