REFERENCE · DIAGNOSTIC TECHNIQUE

FCD Diagnostic Models and Checklists

Clinician-focused educational reference; use within professional competence, consent and an individual assessment plan.

Purpose and Suitability
Anatomy and Physiology
Preparation and Safety
Performing the Assessment
Interpreting Findings
Explaining the Result
Evidence and Limitations
Media and Accessibility
Research and Sources

Purpose and Suitability

Understand what published diagnostic models and checklists add to clinical assessment, and where their evidence stops. These tools estimate or classify diagnostic likelihood; they do not measure everyday disability or assistance needs.

Diagnostic classifier: A rule or score intended to distinguish diagnostic groups. Its accuracy depends on who was studied and how the diagnosis was established.

Use the OT measurement guide for daily-function outcomes.

Anatomy and Physiology

These instruments combine clinical features rather than directly measuring brain pathology. A biomarker-defined comparison group can clarify one research contrast without proving that a questionnaire identifies every cause of cognitive difficulty.

Biomarker: A biological measurement relevant to a disease process; its meaning depends on the test and clinical context.

The FCD-Q8 study below compared selected FCD and early Alzheimer’s disease groups. It was not a study of all possible cognitive presentations. [3]

Preparation and Safety

Explain that a checklist supplements clinical reasoning. Use only the published version and authorized materials within professional competence; do not invite self-diagnosis or rehearse answers.

Do not withhold a chosen supporter, communication aid or access accommodation to satisfy a model feature. Attendance alone, speaking style and time spent describing symptoms can be influenced by transport, disability, language and context. Record these factors rather than treating them as shortcuts to diagnosis.

Performing the Assessment

Proposed diagnostic risk model

A published model combines clinical features to estimate diagnostic likelihood. It supports structured assessment rather than replacing judgment. Its development population and validation limits prevent treating the score as a universal diagnostic threshold. [1]

Functional cognitive disorder checklist

An 11-item and shorter 7-item checklist were developed through literature review, expert consensus and a multicentre pilot study. Results support further use and study, but prospective blinded external validation was still needed. This is not a self-diagnosis checklist. [2]

FCD-Q8: dated research addition

Added October 4, 2026. This is a separate eight-item instrument, not the seven-item version of the Cabreira checklist. A preliminary case-control study tested it against selected biomarker-supported diagnostic groups. Further prospective validation is needed. [3]

For any research instrument, record the version, why it is appropriate, the clinical evidence collected independently, missing items and the limits of application. This page does not reproduce instruments or offer a calculator.

Interpreting Findings

A high score may support further consideration within the studied framework; it does not replace a positive formulation and differential assessment. A low score does not automatically exclude FCD.

Sensitivity and specificity: How often a test identifies the target condition and correctly classifies people without it in the study population.

Reported accuracy in selected memory-clinic samples may not transfer to younger adults, primary care, diverse languages or mixed diagnoses. Diagnostic likelihood does not quantify symptom severity, credibility, capacity, work ability or the amount of care someone needs.

Explaining the Result

Authored example, not a patient quotation:

“This research checklist brings together features that can help clinicians think about the diagnosis. It cannot decide the diagnosis on its own, and it does not score how difficult your daily life is. We will assess those needs separately.”

Evidence and Limitations

Instrument	Study and findings	Main interpretation limit
McWhirter risk model	49 participants without dementia; 31 classified as FCD. Age and length of the initial spoken response formed a model with reported AUC 0.94.	Small development sample and expert-consensus reference diagnosis; not a universal clinical rule.
Cabreira 11-/7-item checklist	Expert development and a 239-person pilot across seven UK memory services, including 143 FCD cases.	Retrospective scoring by clinicians aware of diagnosis; diagnostic suspicion bias and prospective external-validation needs.
FCD-Q8	78 participants in one Spanish tertiary clinic: 34 FCD and 44 early Alzheimer cases; blinded questionnaire assessor. AUC 0.87 (95% CI 0.78–0.95); at ≥5, sensitivity 76.5%, specificity 88.6%.	Preliminary selected, biomarker-enriched case-control sample; broader prospective validation needed.

These studies concern diagnosis, not longitudinal disability measurement. [1][2][3]

AUC: A summary of how well a classifier separates two groups across thresholds. It is not the probability that one person’s diagnosis is correct.

The Cabreira authors called for further validation before recommended clinical use. FCD-Q8 is a different instrument, so its study does not supply that checklist’s external validation. No single item should be used as a diagnostic shortcut. [2][3]

Media and Accessibility

An original study-comparison diagram can show development, pilot testing and external validation. Label sample sizes and study designs. Avoid presenting checkboxes that visitors could complete as a diagnosis quiz.

Provide a plain-language explanation beside any accuracy statistic; do not use colours alone to communicate uncertainty.

Research and Sources

McWhirter’s indexed abstract was reviewed; full-text methodological appraisal remains pending. Cabreira’s full text and FCD-Q8 publisher methods, results and limitations were checked. This is a targeted evidence update, not a completed systematic review of all FCD diagnostic instruments.

Citation	Full citation
[1]	McWhirter L, Ritchie C, Stone J, Carson A. Identifying functional cognitive disorder: a proposed diagnostic risk model. CNS Spectrums. 2022;27(6):754–763. FND-CIT-0026. https://doi.org/10.1017/S1092852921000845
[2]	Cabreira V, Alty J, Antic S, et al. Development of a diagnostic checklist to identify functional cognitive disorder versus other neurocognitive disorders. BMJ neurology open. 2025;7(1):e000918. DOI. PMID: 40034653. FND-CIT-0140.
[3]	García-Roldán E, Almodóvar-Sierra Á, Luque-Tirado A, et al. Preliminary Validation of the FCD-Q8 Tool in Functional Cognitive Disorder and Early Alzheimer’s Disease: A Biomarker-Verified Case–Control Study. European Journal of Neurology. 2025;32(11):e70383. DOI. FND-CIT-0260.

Continue: Functional Cognitive Disorder Diagnostic Inventory

Navigate: Home · Course · Reference Library · Site Map