A classifier system for the diagnosis of disease from routine laboratory values.

LAB VALUES is an expert system that diagnoses the likelihood of various diseases, given the results of routine blood tests. Its knowledge structure employs bit maps. The similarity between a new case and a bit map in the knowledge base is calculated via a similarity score. The system was tested against published cases with definite diagnostic endpoints, and was found to perform well when compared to these published cases. System performance was not improved by incorporating disease frequency into the results.