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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
The AD8 is a brief informant-based cognitive screening interview focused on perceived change in memory, judgment, orientation, and daily cognitive function. Each endorsed change item scores 1 point (total 0-8). A score of 2 or higher is a commonly used threshold for cognitive impairment signal.
Formula: AD8 total = count of endorsed change items (0-8).
AD8 was developed as a rapid informant interview to detect very mild dementia and is widely used with a >=2 screening threshold.
Higher AD8 scores indicate stronger informant-reported cognitive decline signal and support further diagnostic assessment.
Use when a reliable informant is available and quick screening for possible cognitive impairment is needed in primary or specialist care.
Performance depends on informant quality and may be influenced by limited contact, stress, or baseline expectations.
For related assessments, see IQCODE-16, CDR Global and SLUMS Score.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
Estimate informant-reported cognitive decline using the short 16-item IQCODE mean score.
GeriatricsClassify dementia severity with the Clinical Dementia Rating global stage (0, 0.5, 1, 2, 3).
GeriatricsClassify SLUMS cognitive-screen totals (0-30) to support triage for fuller neurocognitive evaluation.
Mental HealthInterpret Montreal Cognitive Assessment (MoCA) scores. The leading cognitive screening tool for mild cognitive impairment and dementia.