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When using a structured data entry mechanism, SNOMED CT encoded data can be selected in a variety of ways. For example, the concepts or descriptions may be selected directly from a list, or the encoding may result from responses to simple choices or the entry of particular values.  Simple reference sets can ensure that SNOMED CT codes are entered effectively and consistently.

A simple reference set of concepts may be used to represent the options available in a small selection list. Similarly, a simple reference set of descriptions or a  language reference set may specify the set of descriptions available for searching in a specific coded data element. The figure below illustrates how a simple reference set is is used as a value set in a data entry form.

Using simple reference sets to constrain data entry.

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Using simple reference sets to constrain data entry