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As many clinical concepts are multidimensional by nature, concepts can have more than one parent. This creates a polyhierarchical structure, which increases the amount of information provided. As the formal representation language of SNOMED CT uses both hierarchical and attributive relationships, the multidimensional character of concepts can be expressed accordingly. Figure 8 shows the polyhierarchical structure of SNOMED CT concepts.

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Figure 8 – Polyhierarchical structure of concepts (as shown in SNOMED International Starter Guide)

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Figure 9 – Full polyhierarchical view of concept 788951001 |Hemorrhage of digestive system (disorder)| (International Edition 2021-07-31) using Ontoserver Shrimp browser (https://ontoserver.csiro.au/shrimp)

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