Screening persons for dementia and a diagnosis of dementia are two different things.
Screening for dementia with tools like the Abbreviated Mental Test (AMT) and Mini Mental State Examination (MMSE) cannot be used to diagnose a person with dementia. They are instead used to spot some obvious symptoms of dementia in persons being screened, after which persons who have been identified with dementia symptoms may be encouraged to consult a doctor for further testing.
Persons who have been identified as having dementia symptoms during screening do not necessarily have dementia, and vice versa: there is some chance that some persons who have not been identified as having dementia symptoms may have dementia.
Dementia screenings are helpful, but are not as thorough as a medically qualified professional’s evaluation and diagnosis.
If someone you know shows signs of dementia, please consult a doctor for testing and diagnosis.