Qin, You, Pang, Feng-Shun, Cai, Bei-Yuan · Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine · 2009
This article reviews how the definition and diagnostic criteria for ME/CFS have changed over time. The authors examine the evolution of how doctors identify and classify this condition using different diagnostic frameworks. Understanding these changes helps patients and doctors communicate more clearly about the disease.
Accurate diagnostic criteria are essential for consistent patient identification, treatment access, and research recruitment. Clarifying how definitions have changed helps explain why different studies may use different patient populations and why some patients are diagnosed while others are not.
This review does not establish which diagnostic criteria are most accurate or clinically superior, nor does it present new evidence about ME/CFS biology or treatment effectiveness. It is a descriptive analysis of existing criteria rather than validation of any particular diagnostic approach.
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
Qin, You, Pang, Feng-Shun, & Cai, Bei-Yuan (2009). [Changes on definition and diagnostic criteria of the chronic fatigue syndrome].. Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine. https://pubmed.ncbi.nlm.nih.gov/20073230/
BibTeX
@article{mecfsatlas-qin-2009-changes-definition,
author = {Qin, You and Pang, Feng-Shun and Cai, Bei-Yuan},
title = {[Changes on definition and diagnostic criteria of the chronic fatigue syndrome].},
journal = {Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine},
year = {2009},
note = {PubMed: 20073230},
url = {https://www.mecfsatlas.com/evidence/qin-2009-changes-definition},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/qin-2009-changes-definition
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