E3 PreliminaryHigher confidencePEM ✓Machine draft
Assessing Functional Capacity in Myalgic Encephalopathy/Chronic Fatigue Syndrome: A Patient-Informed Questionnaire.
Sommerfelt, Kristian, Schei, Trude, Seton, Katharine A et al. · Journal of clinical medicine · 2024 · DOI
Quick Summary
Researchers created a new questionnaire called FUNCAP to measure how much people with ME/CFS can actually do in their daily lives. The tool has two versions: a longer one with 55 questions (for doctors and disability assessments) and a shorter one with 27 questions (for regular check-ups). After testing it with thousands of patients from Norway and around the world, they found it works reliably and accurately captures the impact of ME/CFS on real-life activities.
Why It Matters
Many ME/CFS patients struggle to get accurate diagnoses and access disability benefits because doctors lack standardized tools to measure functional limitations. FUNCAP fills this critical gap by providing a validated, patient-centered assessment that reflects how post-exertional malaise actually impacts daily life—potentially improving both clinical care and research on new treatments.
Observed Findings
- Two versions of FUNCAP were successfully developed and validated: FUNCAP55 (55 questions) and FUNCAP27 (27 questions)
- Both versions showed good reliability and validity in Norwegian (n=1,263) and English-language international (n=1,387) populations
- The questionnaire covers eight functional domains including personal hygiene, mobility, orthostatic tolerance, domestic activities, communication, community participation, light/sound reactions, and concentration
- Minimal floor and ceiling effects were observed, indicating the tool effectively captures the full range of functional impairment
- Comparable psychometric properties were found across both linguistic and geographic populations
Inferred Conclusions
- FUNCAP is a valid and reliable tool for assessing functional capacity specifically in ME/CFS patients
- Both the 55-question and 27-question versions are suitable for different clinical contexts: longer version for diagnosis and disability assessments, shorter version for routine follow-up and research
- Patient-informed development process successfully created a questionnaire that accurately reflects the lived experience of ME/CFS-related functional limitations
- The questionnaire's performance across different populations suggests broad applicability for international clinical and research use
Remaining Questions
What This Study Does Not Prove
This study does not prove that FUNCAP is superior to other functional assessment tools, nor does it demonstrate whether the questionnaire can predict disease progression or treatment response. It also does not establish which specific interventions might improve functional capacity—it only measures capacity itself.
Tags
EXPLORATORYPEM DEFINED
Metadata
- DOI
- 10.3390/jcm13123486
- PMID
- 38930014
- Review status
- Machine draft
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 8 April 2026