title: Automated mapping of observation codes using extensional definitions.
abstract: OBJECTIVE
  To create "extensional definitions" of laboratory codes from derived characteristics of coded values in a clinical database and then use these definitions in the automated mapping of codes between disparate facilities.
  
  
  METHODS
  Repository data for two laboratory facilities in the Intermountain Health Care system were analyzed to create extensional definitions for the local codes of each facility. These definitions were then matched using automated matching software to create mappings between the shared local codes. The results were compared with the mappings of the vocabulary developers.
  
  
  METHODS
  The number of correct matches and the size of the match group were recorded. A match was considered correct if the corresponding codes from each facility were included in the group. The group size was defined as the total number of codes in the match group (e.g., a one-to-one mapping is a group size of two).
  
  
  RESULTS
  Of the matches generated by the automated matching software, 81 percent were correct. The average group size was 2.4. There were a total of 328 possible matches in the data set, and 75 percent of these were correctly identified.
  
  
  CONCLUSIONS
  Extensional definitions for local codes created from repository data can be utilized to automatically map codes from disparate systems. This approach, if generalized to other systems, can reduce the effort required to map one system to another while increasing mapping consistency.
authors.affiliation: University of Utah and Intermountain Health Care, Salt Lake City, Utah 84132, USA. kenneth.zollo@hsc.utah.edu
authors.forename: K A
authors.initials: KA
authors.lastname: Zollo
authors.forename: S M
authors.initials: SM
authors.lastname: Huff
mesh_terms: D000465:Algorithms; D002984:Clinical Laboratory Information Systems / Q000592:standards*; D001330:Electronic Data Processing; D016347:Medical Records Systems, Computerized / Q000592:standards*; D012984:Software; D018875:Vocabulary, Controlled