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Unified Medical Language System® (UMLS®)

Lexical Variant Generation (LVG)

The Lexical Variant Generation program contains a series of commands that can be selected and combined to perform lexical transformations to text. A variety of commands are available to process lexical variations such as:

  • Inflections and conjugations
  • Word order in multi-word terms
  • Alphabetic case
  • Punctuation
  • Possessives

Users can create their own sequence of commands to process text to meet the needs of their applications. The Norm program is a predefined set of commands from the LVG program packaged together.

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