Cognitive Change Screen Calculator
An informant-style yes/no screen for recent changes in memory and thinking, modelled on the AD8, with a prompt on when to seek review.
How it works
count "yes" answers to 8 change-based items (AD8-style) · 2 or more = screen-positive → discuss a fuller cognitive assessment
The AD8 is a short informant questionnaire that asks about change from a person's previous ability — not whether they can perform a task, but whether they have got worse at it. Because it targets decline, it helps separate normal aging from early dementia. Two or more "yes" answers is the usual screen-positive cutoff and a signal to seek a proper evaluation. Crucially, a positive screen is not a diagnosis: reversible causes such as medication side effects, depression, thyroid disorders, vitamin B12 deficiency and poor sleep can all mimic cognitive decline and should be checked.
Worked example
A family member notices their relative now repeats stories, has trouble managing the bills, and forgets appointments — three change items. That is 3 of 8, above the cutoff of 2, so an AD8-style screen would be positive and prompt a medical review.
Frequently asked questions
Who should answer these questions?
The AD8 works best answered by someone who knows the person well (an informant), because they can judge change over time. It can also be self-answered, but insight is sometimes reduced in early cognitive decline.
Does a positive screen mean dementia?
No. It means a fuller assessment is worthwhile. Many causes of these changes are treatable and reversible, and only a clinical evaluation can determine the cause.
What is the difference between normal aging and this?
Occasionally forgetting a name or where you left keys is normal. The AD8 focuses on a decline from a person's own prior level — a consistent change — which is more concerning than isolated lapses.
Related calculators
Educational estimate only — not a medical diagnosis or a substitute for professional assessment. Screening scores and reference values are population tools; they cannot judge your individual health. Discuss any concerns with a doctor, nurse or pharmacist.