Clock Drawing Task (Cognitive Impairment Screening)


Draws closed circle (1 point)

Draws numbers in correct position (1 point)

Correctly includes all 12 numbers (1 point)

Draws hands in correct position asked by examiner (1 point)

Total Criteria Point Count:


CDT Score

4 points: No obvious impairment
1 to 3 points: Possible cognitive impairment


  1. Nolan KA, Mohs RC. Screening for dementia in family practice. In: Richter RW, Blass JP eds. Alzheimer's Disease: A guide to practical management, Part II. St. Louis, Mo. Mosby Year Book, Inc. 1994:81-95. OCLC: 39751494 WorldCat Logo



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