Purpose: The Kentucky Aphasia Test (KAT) is an objective measure of language functioning for persons with aphasia. This article describes materials, administration, and scoring of the KAT; presents the rationale for development of test items; reports information from a pilot study; and discusses the role of the KAT in aphasia assessment.
Method: The KAT has 3 parallel test batteries, KAT-1, KAT-2, and KAT-3. Each battery contains the same orientation test and 6 subtests, each with 10 items, assessing expressive and receptive language functions. Subtests for KAT-1, KAT-2, and KAT-3 systematically increase in difficulty so that it is possible to assess individuals with severe, moderate, and mild aphasia, respectively. The KAT was administered to 38 participants with aphasia and 31 non-brain-damaged (NBD) participants.Results: Results with the KAT clearly differentiated the language performance of individuals with and without aphasia. NBD participants made few errors, and overall scores on the test for individuals with aphasia were rarely within 1 SD of the NBD group. Performance of the participants with aphasia administered KAT-1, KAT-2, and KAT-3 suggested that the 3 versions of the test represent a hierarchy of difficulty.