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Clinical Manifestations.

Amit Das1, Matthew P Janicki2,3, Natalia S Rozas1

  • 1LuMind IDSC Foundation, Woburn, MA, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

Specialized tools are crucial for diagnosing Alzheimer's disease in people with Down syndrome (DS-AD), as standard methods are ineffective, especially for those with moderate to severe intellectual disability (ID). Informant-based assessments are recommended across all ID levels.

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Area of Science:

  • Gerontology and Neurodegenerative Diseases
  • Genetics and Developmental Disabilities
  • Clinical Assessment and Diagnostics

Background:

  • Individuals with Down syndrome (DS) face a substantially elevated risk for Alzheimer's disease (AD) compared to the neurotypical (NT) population.
  • The inherent intellectual disability (ID) in DS necessitates specialized assessment tools for detecting cognitive decline in DS-associated AD (DS-AD).

Purpose of the Study:

  • To investigate international perspectives on the utility and application of assessment tools for DS-AD.
  • To evaluate the effectiveness of existing DS-AD assessment tools across varying levels of intellectual disability.

Main Methods:

  • A survey was distributed to 51 international DS-AD clinicians and researchers.
  • Analysis included 43 complete submissions, focusing on the utility and appropriateness of ten DS-AD assessment tools (five informant-based, five direct assessments).
  • Survey queried clinical staging of mild cognitive impairment in DS (MCI-DS) and DS-AD Dementia.

Main Results:

  • Over 95% of respondents agreed that NT-designed AD tools are unsuitable for detecting MCI-DS and DS-AD Dementia, particularly in individuals with moderate-to-severe ID.
  • Informant-based assessments were highly rated for usefulness and appropriateness across all ID severity levels (mild to profound).
  • Direct assessments were deemed highly useful primarily for mild-to-moderate ID, with significantly lower appropriateness ratings for severe and profound ID.

Conclusions:

  • There is a strong consensus on the limited utility of NT-designed AD tools for DS-AD diagnosis, highlighting the critical need for specialized DS tools.
  • Informant-based tools are recommended for broader applicability across ID spectrums, while direct assessments are best suited for milder ID.
  • Regional variations in tool awareness underscore the need for a global framework to standardize DS-AD assessment and ensure evidence-based care.