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A system user enters the search string "Fragmentation of renal calculus;" the search returns no results. The search application that the user has been provided with has the option to extend the search by using the word equivalents table (see 

Word Equivalents Table Example

Extending searches with word equivalents - step 1

The user selects this option (or it is invoked automatically because the initial search without word equivalents found nothing) and searches again using the same search string. The table is used to make substitutions in the search string to produce all possible unique search variants: 

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These 8 search variants are used as the target phrases for the searches. The search results of these variants are combined, duplicate Concepts are eliminated and the list of search results is returned.

Extending searches with word equivalents - step 2

For more information on the the search support tables provided by SNOMED International, please see  6.1.5 Search Support Tables.

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