Wiedbusch, Elzbieta, Jason, Leonard A · Archives of community medicine · 2022 · DOI
This study looked at five different ways to measure how much ME/CFS reduces a person's ability to function in daily life—something that is a key part of diagnosis. Using a large international group of over 2,300 patients and 359 healthy controls, researchers found that all five methods worked reasonably well, but a simple single-question approach was the best at identifying who actually had ME/CFS. This suggests doctors could use an easier, faster method to assess this important symptom.
Defining and measuring functional impairment is central to ME/CFS diagnosis, yet inconsistency in how this is assessed creates challenges for patients seeking diagnosis and researchers conducting studies. This study provides evidence that a simple, single-question approach can be as effective as more complex methods, which could streamline diagnosis and make it more accessible to patients worldwide. Standardizing functional assessment could reduce diagnostic delays and improve consistency in research and clinical practice.
This study does not establish causation or explain why functional impairment occurs in ME/CFS—it only measures how to assess it. The cross-sectional design cannot determine whether functional decline preceded or followed illness onset, or whether the measured impairment is stable over time. Results apply to this specific population and may not generalize to all ME/CFS presentations, particularly in understudied populations.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Wiedbusch, Elzbieta & Jason, Leonard A (2022). Comparing Operationalized Approaches for Substantial Reduction of Functioning in Chronic Fatigue Syndrome and Myalgic Encephalomyelitis.. Archives of community medicine. https://doi.org/10.36959/547/653
BibTeX
@article{mecfsatlas-wiedbusch-2022-comparing-operationalized,
author = {Wiedbusch, Elzbieta and Jason, Leonard A},
title = {Comparing Operationalized Approaches for Substantial Reduction of Functioning in Chronic Fatigue Syndrome and Myalgic Encephalomyelitis.},
journal = {Archives of community medicine},
year = {2022},
doi = {10.36959/547/653},
note = {PubMed: 35673386},
url = {https://www.mecfsatlas.com/evidence/wiedbusch-2022-comparing-operationalized},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/wiedbusch-2022-comparing-operationalized
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