Investigation of suspected chronic fatigue syndrome/myalgic encephalopathy.
Owe, Jone Furlund, Næss, Halvor, Gjerde, Ivar Otto et al. · Tidsskrift for den Norske laegeforening : tidsskrift for praktisk medicin, ny raekke · 2016 · DOI
Quick Summary
This study looked at 365 people who came to a hospital's neurology department because they thought they might have ME/CFS. The doctors found that only about 13% actually had ME/CFS, while nearly half of the patients had mental health or stress-related conditions instead. The study highlights how important it is for doctors to do thorough checks before deciding someone has ME/CFS, since other treatable conditions can cause similar fatigue symptoms.
Why It Matters
This study is important because it shows that many patients referred for ME/CFS actually have other treatable conditions, particularly mental health disorders. For ME/CFS patients and researchers, this underscores the need for better diagnostic clarity and earlier identification of alternative causes, potentially reducing diagnostic delays and ensuring patients receive appropriate care faster.
Observed Findings
Only 48 out of 365 patients (13.2%) referred for suspected CFS/ME received a CFS/ME diagnosis
Mental and behavioural disorders were diagnosed in 169 patients (46.3%), representing the largest diagnostic group
18 patients (4.9%) were diagnosed with post-infectious fatigue
Two patients with serious unrecognized somatic illness were identified through the assessment
MRI and lumbar puncture identified changes of uncertain significance in a small number of patients
Inferred Conclusions
Thorough somatic and psychiatric investigation before specialist referral could improve diagnostic efficiency and reduce inappropriate referrals
Mental disorders and life crisis reactions are common and important differential diagnoses that must be carefully distinguished from ME/CFS
Long specialist waiting times may delay diagnosis for patients with psychiatric causes of fatigue, who could benefit from earlier appropriate treatment
A systematic assessment protocol can identify rare serious somatic illnesses that might otherwise be missed in patients presenting with fatigue
Remaining Questions
What percentage of the 169 patients with mental/behavioural diagnoses also had concurrent CFS/ME or post-infectious fatigue?
What This Study Does Not Prove
This study does not prove that mental health diagnoses are more common than ME/CFS in the general population—it only reflects patterns in patients referred to a specialist neurology clinic, which likely enriches for certain diagnostic categories. It also does not establish causation or mechanisms, nor does it clarify whether psychiatric conditions coexist with ME/CFS or are differential diagnoses. The study design cannot determine whether long waiting times actually caused diagnostic delays or only correlate with them.
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 →
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What specific neuroimaging and CSF findings were identified, and what is their clinical significance?
How many patients with mental disorder diagnoses had received prior assessment in primary care, and what factors contributed to referral to specialist services?
What are the long-term outcomes for patients diagnosed with mental/behavioural disorders versus those with CFS/ME diagnoses?