Bates, D W, Buchwald, D, Lee, J et al. · Archives of internal medicine · 1995
Researchers compared blood test results from 579 ME/CFS patients with results from 147 healthy people. They found that ME/CFS patients were much more likely to have certain abnormal results, particularly immune-related changes like unusual white blood cells and immune complexes. However, no single test was abnormal enough in all patients to serve as a reliable diagnostic tool on its own.
This study provided early evidence that ME/CFS involves measurable immune system abnormalities rather than being purely psychological, lending biological credibility to the diagnosis when it was still frequently dismissed. Identifying patterns of immune dysfunction may help researchers understand ME/CFS pathophysiology and eventually develop targeted treatments. The multicenter, geographically diverse design strengthens confidence that findings reflect genuine disease characteristics rather than local variation.
This study does not establish that any of these laboratory abnormalities *cause* ME/CFS or that they are unique to ME/CFS—the authors explicitly note that specificity relative to other organic and psychiatric conditions producing fatigue remains unestablished. The case-control design cannot determine whether immune abnormalities precede symptom onset or are consequences of chronic illness. No individual test was sensitive or specific enough to serve as a diagnostic biomarker.
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
Bates, D W, Buchwald, D, Lee, J, Kith, P, Doolittle, T, Rutherford, C, et al. (1995). Clinical laboratory test findings in patients with chronic fatigue syndrome.. Archives of internal medicine. https://pubmed.ncbi.nlm.nih.gov/7632202/
BibTeX
@article{mecfsatlas-bates-1995-clinical-laboratory,
author = {Bates, D W and Buchwald, D and Lee, J and Kith, P and Doolittle, T and Rutherford, C and Churchill, W H and Schur, P H and Wener, M and Wybenga, D},
title = {Clinical laboratory test findings in patients with chronic fatigue syndrome.},
journal = {Archives of internal medicine},
year = {1995},
note = {PubMed: 7632202},
url = {https://www.mecfsatlas.com/evidence/bates-1995-clinical-laboratory},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/bates-1995-clinical-laboratory
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