The Mini-Cog shows whether a person may have clinically important cognitive impairment. It does not diagnose Alzheimer's disease or identify the cause of any impairment. Clinicians use this brief cognitive screen as one piece of an Alzheimer's evaluation. The result helps determine whether the person needs more detailed testing.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does the Mini-Cog measure?
- How is the test scored?
- How reliable is the result?
- What should happen after the screen?
What does the Mini-Cog measure?
The Mini-Cog takes about three minutes. It combines delayed recall of three words with a clock-drawing task, according to the National Institute on Aging's cognitive assessment resources. The word-recall task samples memory.
Drawing a clock also draws on executive abilities—the mental skills used to organize and complete a task—and visuospatial abilities, which help a person understand shapes and spatial relationships. Because the screen samples only a few abilities, it cannot provide a complete picture of someone's thinking or daily functioning. It also cannot show whether Alzheimer's disease, another condition, or some other factor explains a low score.
How is the test scored?
The Mini-Cog has a five-point scoring scale: The official Mini-Cog scoring guidance says a score of 0 to 2 indicates a higher likelihood of clinically important cognitive impairment. This is a screening threshold, not confirmation that the person has dementia or Alzheimer's disease.
A score of 3 to 5 indicates a lower likelihood of dementia. However, it does not rule out cognitive impairment, especially when the person or someone close to them has noticed changes in memory, judgment, language, or other thinking abilities.
- Uncued recall of the three words earns 0 to 3 points.
- The clock drawing earns either 0 or 2 points.
- The two results are added for a total between 0 and 5.
How reliable is the result?
The Mini-Cog can identify many people who have dementia, but its result is not certain for an individual. In a population-based study of 1,119 older adults, the test had 76% sensitivity and 89% specificity for independently diagnosed dementia, as reported by University of Washington investigators in the Journal of the American Geriatrics Society. In practical terms, some people with dementia received a result below the screening threshold, while some without dementia screened positive.
A person's score therefore needs interpretation alongside reported symptoms, health information, and daily functioning. The broader evidence also has limits. A Cochrane review found only three eligible community studies, with variable accuracy and methodological problems that may have inflated performance estimates. The Mini-Cog should not be treated as a stand-alone community diagnostic test.
What should happen after the screen?
A score of 0 to 2 should prompt a comprehensive evaluation or referral for further assessment. A score of 3 to 5 may still justify that evaluation when memory or thinking concerns persist.
An Alzheimer's evaluation examines both whether cognitive decline is present and what may be causing it. According to the National Institute on Aging's diagnostic overview, that process can include: Before the appointment, write down specific changes and how they affect everyday tasks. If possible, ask someone familiar with those changes to contribute to the history, since a Mini-Cog score alone cannot establish mild cognitive impairment, dementia, or Alzheimer's disease.
- A history from the person and someone who knows them well
- More detailed cognitive and functional testing
- A physical or neurological examination
- Laboratory testing
- In some cases, CT, MRI, PET, or biomarker testing
