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Abbreviated mental test score
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Abbreviated mental test score
The Abbreviated Mental Test Score (AMTS) is a 10-point test designed for the rapid assessment of elderly patients for potential dementia. It is recommended as the primary screening tool in emergency and hospital settings for patients over 65. First introduced in 1972, it is now also utilized to assess mental confusion (including delirium) and other cognitive impairments. The test takes approximately 3–4 minutes to administer and requires no specialist training or licensing.
The AMTS was developed to address the need for a rapid, practical method of assessing cognitive impairment in geriatric patients. In 1972, Hodkinson adapted it from the 26-item Blessed Dementia Scale (BDS) by removing 16 items: 13 for repetitiveness, 2 for being too easy, and 1 for being too difficult. Validation studies revealed a near-linear correlation between AMTS and BDS scores, indicating strong convergent validity and measurement accuracy.
The standard AMTS consists of 10 questions that assess orientation, memory, and attention. The following questions are put to the patient. Each question correctly answered scores one point. A score of 7–8 or less suggests cognitive impairment at the time of testing, although further and more formal tests are necessary to confirm a diagnosis of dementia, delirium or other causes of cognitive impairment. Culturally-specific questions may vary based on region.
The AMTS has been criticised for containing culturally and temporally outdated questions. For example, the World War I question was gradually revised to ask for the start of World War II as fewer elderly patients had direct experience of the earlier conflict; however, even World War II is now beyond the lived experience of many older adults, causing the question to no longer assess time-orientation but rather semantic memory as many patients struggle to answer correctly, not due to cognitive impairment but because of limited personal relevance, reducing the test's diagnostic accuracy. Experts have suggested that recalling distant historical dates is an unreliable measure of cognitive impairment as answers are often confounded by retroactive interference from recent memories.
As no formal administration training is required, many clinicians administer and score the AMTS incorrectly. Score cut-off thresholds for cognitive impairment vary widely from 6–10, undermining the test's diagnostic reliability.
The AMTS poorly distinguishes between dementia and delirium, and lacks sensitivity to detect mild cognitive impairment, making it a poor tool for differentiation and early-stage diagnostics.
Shorter Versions
The AMT4 uses 4 items from the AMTS, with a cut off score of 3 or 4 compared to the usual 8 or 9. The AMT4 is part of the 4AT scale for delirium. The AMT5 includes 5 items. Despite its cut-off score of 4, it is still highly prone to false-positives.
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Abbreviated mental test score
The Abbreviated Mental Test Score (AMTS) is a 10-point test designed for the rapid assessment of elderly patients for potential dementia. It is recommended as the primary screening tool in emergency and hospital settings for patients over 65. First introduced in 1972, it is now also utilized to assess mental confusion (including delirium) and other cognitive impairments. The test takes approximately 3–4 minutes to administer and requires no specialist training or licensing.
The AMTS was developed to address the need for a rapid, practical method of assessing cognitive impairment in geriatric patients. In 1972, Hodkinson adapted it from the 26-item Blessed Dementia Scale (BDS) by removing 16 items: 13 for repetitiveness, 2 for being too easy, and 1 for being too difficult. Validation studies revealed a near-linear correlation between AMTS and BDS scores, indicating strong convergent validity and measurement accuracy.
The standard AMTS consists of 10 questions that assess orientation, memory, and attention. The following questions are put to the patient. Each question correctly answered scores one point. A score of 7–8 or less suggests cognitive impairment at the time of testing, although further and more formal tests are necessary to confirm a diagnosis of dementia, delirium or other causes of cognitive impairment. Culturally-specific questions may vary based on region.
The AMTS has been criticised for containing culturally and temporally outdated questions. For example, the World War I question was gradually revised to ask for the start of World War II as fewer elderly patients had direct experience of the earlier conflict; however, even World War II is now beyond the lived experience of many older adults, causing the question to no longer assess time-orientation but rather semantic memory as many patients struggle to answer correctly, not due to cognitive impairment but because of limited personal relevance, reducing the test's diagnostic accuracy. Experts have suggested that recalling distant historical dates is an unreliable measure of cognitive impairment as answers are often confounded by retroactive interference from recent memories.
As no formal administration training is required, many clinicians administer and score the AMTS incorrectly. Score cut-off thresholds for cognitive impairment vary widely from 6–10, undermining the test's diagnostic reliability.
The AMTS poorly distinguishes between dementia and delirium, and lacks sensitivity to detect mild cognitive impairment, making it a poor tool for differentiation and early-stage diagnostics.
Shorter Versions
The AMT4 uses 4 items from the AMTS, with a cut off score of 3 or 4 compared to the usual 8 or 9. The AMT4 is part of the 4AT scale for delirium. The AMT5 includes 5 items. Despite its cut-off score of 4, it is still highly prone to false-positives.