Alzheimer's Disease Assessment Scale (Cognitive Subscale)
The Alzheimer’s Disease Assessment Scale (Cognitive Subscale) measures the severity of cognitive dysfunctions characteristic of persons with Alzheimer’s disease. The word recall task is administered first. The next 10 minutes are spent in open-ended conversation to assess speech function. Then the other cognitive tasks are administered. Patients are rated on a scale from 0-5 on most questions, reflecting the degree of severity of dysfunction. Questions 1, 6, and 7, are rated on a scale of 0-10, 0-8, and 0-12, respectively. A rating of 0 signifies no impairment on a task or absence of a particular behavior, while a rating of 5 (or 8, 10, or 12) is reserved for the most severe or most frequent degree of impairment. A rating of 1 refers to a very mild indication of impairment on a given task. Ratings of 2, 3, or 4 refer to mild, moderate, and moderately severe impairments on the given task, respectively. The ADAS-COG requires about 30-45 minutes to administer completely.
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