Clinician reference tool — not medical advice. This is a clinical decision-aid intended for healthcare professionals: it gives deterministic suggestions to think with, not a diagnosis or a prescription. If you’re a patient, you’re welcome to look around — but please review anything here with your own doctor; it isn’t a substitute for personalized medical care.

Evidence: Systematic review of dietary supplementation for ME/CFS f… 2025 · sources last checked 2026-08-20

Reference tool — not medical advice. Thresholds, targets, and first-line agents differ by guideline body and change over time — switch the lens to compare. Clinician judgement, dosing/monitoring, contraindications, and live coverage always required. Runs entirely in your browser — no data is collected.

ME/CFS management guide

A care guide for myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS), anchored on NICE NG206 (2021). Energy management / PACING is the cornerstone; graded exercise therapy is NOT recommended (it can cause harm). Toggle the professional lens (conventional / naturopathic / dietary) to see honestly-graded adjuncts — never replacements for evidence-based care.

Guideline lens

Severity (NICE)choose one

Predominant symptoms

Comorbidities

Flags

⚠ This is a real biological illness

Post-exertional malaise (PEM) is cardinal — management centres on PACING (staying within the energy envelope), NOT pushing through. There is no pharmacologic cure; every option here is symptom-directed and adjunctive.

Cornerstone

Energy management / pacing — patient-led, across physical, cognitive, emotional and social exertion

GET

Graded exercise therapy is NOT recommended (NICE NG206, 2021) — it can cause harm. Do not advise 'push through' or 'exercise as a cure'.

Lens

Conventional (NICE NG206) — the evidence-based foundation

With every activity recommendation

Pair every activity or exercise recommendation with this: listen to your body and don't overdo it; the patient decides the amount and intensity in the moment.

In ME/CFS this means pacing within the energy envelope to avoid post-exertional malaise; graded exercise therapy is not advised (NICE NG206).

Notes

  • • ME/CFS is a real, biological, multi-system illness — NOT deconditioning, somatization or a psychological disorder. Validate it. Mood symptoms are a consequence of a disabling, often-dismissed illness, not its cause.
  • • Post-exertional malaise (PEM) is the cardinal feature: a delayed, disproportionate worsening after exertion of ANY kind (physical, cognitive, emotional, sensory). Management centres on PACING within the energy envelope — not pushing through.
  • • Do NOT prescribe graded exercise therapy or advise patients to 'push through' (NICE NG206, 2021 — can cause lasting harm). CBT, if used at all, is a supportive coping tool offered by choice — never framed as a cure or as treating 'abnormal illness beliefs'.
  • • Drug hypersensitivity is common — start any medication (sleep, orthostatic, pain) at a fraction of the usual dose and titrate very slowly.
  • • Canada has no national guideline that has undergone NICE's 2021 GET/CBT reversal (the Alberta 2016 CPG predates it) — this tool follows NICE NG206 as the most current authoritative guidance.

Suggested drug classesLens: Conventional. Complementary lenses are adjuncts, not replacements for evidence-based care.

Select severity and predominant symptoms to begin.

Switch the professional lens to compare conventional care with honestly-graded naturopathic and dietary adjuncts — the pacing cornerstone and the no-GET rule hold across all lenses.

Should I be tested?

Last reviewed 2026-09-23

"Should I be tested?" for ME/CFS

Clinical diagnosis — no single test

Also called: ME/CFS testing, chronic fatigue syndrome diagnosis, myalgic encephalomyelitis testing, is it CFS, CFS blood test

Patients who have had unexplained, disabling fatigue for months, often after reading about ME/CFS online or being told about it by an ND, want to know whether a blood test can confirm it. ME/CFS is a real, recognized diagnosis with defined criteria (IOM/NAM 2015 SEID criteria; NICE NG206 2021), but it is diagnosed clinically, from the symptom pattern, not from a lab result; testing exists to exclude other explanations, and normal results are the expected finding rather than a dead end.

Raises suspicion

  • • Post-exertional malaise: a delayed worsening of symptoms, hours to days after physical, cognitive or emotional exertion, out of proportion to what was done, that can take days or weeks to settle
  • • Unrefreshing sleep alongside the crash pattern above
  • • Cognitive difficulty (slowed thinking, poor concentration or memory) or orthostatic intolerance (worse standing: light-headed, foggy, racing heart)
  • • A substantial reduction in ability to do occupational, educational, social or personal activities, present for at least 6 weeks in adults (4 weeks in children/young people)

Does not raise suspicion

  • • Ordinary tiredness that recovers with a normal night's rest and does not show the delayed, disproportionate crash pattern
  • • Fatigue that is fully explained by another already-diagnosed condition, poor sleep habits, or a known medication effect
  • • Feeling run down without the combination of post-exertional malaise, unrefreshing sleep, and cognitive or orthostatic symptoms

Red flags

  • • Unintentional weight loss, fever, or night sweats: need work-up for a systemic cause, not managed as ME/CFS
  • • New focal neurological signs (weakness, numbness, or problems with speech or vision): need urgent neurological assessment
  • • Fainting (loss of consciousness), rather than just feeling faint: needs its own assessment

Who to test

More likely instead

Counselling script

“There's no blood test that confirms ME/CFS — the diagnosis rests on your history, especially the delayed crash after exertion, unrefreshing sleep, and cognitive or orthostatic symptoms. We'll run a focused panel to rule out other explanations, not to confirm the diagnosis, so a normal result is expected and doesn't mean nothing is wrong. If you're feeling worse standing up, that's worth checking too, since it's common and often treatable.”

Chart snippet (OSCAR-safe plain text)

Concern discussed, not tested

Concern re: ME/CFS discussed, raised by patient or after online research.
Discriminating features: post-exertional malaise, unrefreshing sleep, cognitive or orthostatic symptoms >6 weeks; reviewed.
Red flags: weight loss, fever, night sweats, focal neurological signs, fainting; absent.
Assessment: pattern consistent with possible ME/CFS; no diagnostic test exists, exclusion work-up appropriate.
Plan: exclusion panel considered per NICE NG206; orthostatic stand test discussed.
Ref: NICE NG206 2021; IOM/NAM 2015 SEID criteria (Jason et al).
Patient given info page: https://chronic-fatigue-syndrome.ajaxharwoodclinic.com/patient
Revisit if: new focal neurological signs, weight loss, fever, or fainting develop.

Testing ordered

Concern re: ME/CFS discussed.
Discriminating features: post-exertional malaise, unrefreshing sleep, cognitive or orthostatic symptoms >6 weeks; red flags absent.
Assessment: exclusion work-up indicated; no diagnostic test exists for ME/CFS itself.
Plan: CBC, electrolytes, kidney function, liver panel, TSH, A1C/glucose, ferritin, celiac serology ordered; additional tests by clinical judgement.
Ref: NICE NG206 2021; IOM/NAM 2015 SEID criteria (Jason et al).
Patient given info page: https://chronic-fatigue-syndrome.ajaxharwoodclinic.com/patient
Revisit if: results do not explain the picture, or red-flag features develop.

Revisit if

  • • Red-flag features develop (weight loss, fever, night sweats, focal neurological signs, fainting)
  • • Exclusion tests reveal an alternative explanation, which is then managed on its own terms
  • • Symptoms worse on standing persist despite reassurance, warranting a formal orthostatic assessment

References

  1. 1. NICE. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (NG206) (2021)States there is currently no diagnostic test for ME/CFS and it is recognised on clinical grounds
  2. 2. NICE. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (NG206) (2021)Lists the initial investigations used to exclude other diagnoses when ME/CFS is suspected
  3. 3. Jason LA et al., DePaul University (summarising the IOM/NAM 2015 report). Examining the Institute of Medicine's Recommendations Regarding Chronic Fatigue Syndrome: Clinical Versus Research Criteria (2015)Describes the IOM/NAM 2015 SEID criteria: post-exertional malaise, unrefreshing sleep, plus cognitive impairment or orthostatic intolerance
Evidence notes

Tag rationale: B, not borderline. ME/CFS is a real, defined clinical diagnosis (IOM/NAM 2015 SEID criteria; NICE NG206 2021) but has no confirmatory lab test, which is exactly the B definition. This record is written to sit alongside the existing ahc-chronic-fatigue-syndrome clinician page, which already cites NICE NG206 and IOM/NAM (its own references 1-2) but currently has almost no content on the initial exclusion work-up or orthostatic testing (per docs/ecosystem-survey.md); this record fills that gap rather than duplicating the management content already there. Gap: hs-CRP exists in the TestSelect catalogue but its verdict is restricted to cardiovascular risk stratification (not general inflammation screening), so it is deliberately NOT linked here even though NICE NG206 lists plain CRP in its exclusion panel — these are different clinical uses of the same analyte and conflating them would misrepresent the hs-crp test record. Wished-for test ids: a standard (non-cardiovascular) CRP/ESR entry, and a creatine kinase entry, would let more of the NG206 panel be catalogued precisely. The NASA 10-minute lean/stand test and 9am cortisol are noted as plain text per the brief's convention for tests with no TestSelect record.

Popular labels: what they mean

"Chronic EBV" / "reactivated Epstein-Barr" as a cause of fatigue

Not a recognized medical diagnosis

Also called: chronic EBV, reactivated Epstein-Barr, EBV reactivation, chronic mono, Epstein-Barr fatigue

After fatigue persists, patients or NDs sometimes order EBV antibody panels, and a positive result is interpreted as 'reactivated' or 'chronic' EBV driving the symptoms. Almost every adult has been infected with EBV and carries antibodies for life, which makes a positive result an easy but misleading explanation to land on; it is a fair thing to want an answer for, and the underlying tiredness is real even when this particular explanation is not supported.

Raises suspicion

  • • This chronic-fatigue label itself has no validated test or diagnostic criteria
  • • A compatible acute illness right now (fever, sore throat, lymphadenopathy, sometimes splenomegaly) supports a real, different, self-limited diagnosis: acute infectious mononucleosis
  • • Markedly elevated whole-blood EBV DNA with fever, lymphadenopathy, splenomegaly, hepatitis, or unexplained low blood counts persisting over months, especially in a child or young adult, raises a rare, distinct, specialist diagnosis: chronic active EBV disease (CAEBV)

Does not raise suspicion

  • • A positive VCA IgG or EBNA antibody result in an adult with chronic fatigue: over 90% of adults carry these antibodies for life after a past infection, so this is the expected, near-universal finding, not evidence of reactivation
  • • A 'high' or fluctuating antibody titre without any current acute illness

Red flags

  • • Splenomegaly, or left upper quadrant or shoulder-tip pain, after a mono-like illness: risk of splenic rupture, avoid contact sports and heavy lifting until cleared
  • • Airway compromise from tonsillar swelling in acute mono: needs urgent assessment
  • • The CAEBV picture above (persistent fever, lymphadenopathy, splenomegaly, hepatitis, low blood counts over months): needs urgent specialist referral

Who to test

  • Compatible acute illness (fever, sore throat, lymphadenopathy) suggesting infectious mononucleosisMonospot (heterophile antibody, CONO-orderable #94) or VCA IgM; no TestSelect entry yet for either.
  • Chronic fatigue alone, to look for 'chronic' or 'reactivated' EBVEBV antibody testing (VCA IgG, EBNA) has no validated use for this; nearly all adults are seropositive for life, and a positive result does not diagnose reactivation or explain the fatigue.
  • Suspected CAEBV (rare): persistent fever, lymphadenopathy, splenomegaly, hepatitis, or low blood counts over monthsQuantitative whole-blood EBV DNA PCR plus specialist hematology or infectious-disease referral; no TestSelect entry, this is a specialist-directed rare-disease work-up.

More likely instead

  • • ME/CFS (assessed on its own criteria)
  • • Depression
  • • Hypothyroidism
  • • poor sleep habits (insomnia)
  • • another already-explained cause of fatigue

Counselling script

“A positive EBV antibody test doesn't mean the virus has 'reactivated' — over 90% of adults carry these antibodies for life after a past infection, so this is the expected finding, not evidence of ongoing illness. If you have fever, sore throat and swollen glands right now, we'd check for active mono instead, which is a different, treatable question. True chronic active EBV disease is real but extremely rare and looks quite different from ordinary fatigue.”

Chart snippet (OSCAR-safe plain text)

Concern discussed, not tested

Concern re: 'chronic'/'reactivated' EBV discussed as cause of fatigue, raised by patient, ND, or prior antibody panel.
Discriminating features for acute mono or CAEBV: absent.
Assessment: EBV antibody seropositivity (VCA IgG/EBNA) is near-universal in adults and does not indicate reactivation or explain chronic fatigue; distinguished from acute infectious mononucleosis and from rare chronic active EBV disease.
Plan: no EBV antibody panel ordered for this indication; alternative causes of fatigue considered.
Ref: CDC EBV laboratory testing guidance; Kawada et al CAEBV guidelines 2023.
Patient given info page: https://chronic-fatigue-syndrome.ajaxharwoodclinic.com/patient
Revisit if: fever, sore throat and lymphadenopathy develop, or fever, night sweats, lymphadenopathy, splenomegaly, or low blood counts persist over months.

Revisit if

  • • A compatible acute illness develops (fever, sore throat, lymphadenopathy): assess for infectious mononucleosis on its own terms
  • • Persistent fever, lymphadenopathy, splenomegaly, hepatitis, or low blood counts over months: urgent specialist referral for suspected CAEBV
  • • Fatigue persists: reassess against ME/CFS criteria in its own right

References

  1. 1. CDC. Laboratory Testing for Epstein-Barr Virus (EBV) (2026)Over 90% of adults have been infected with EBV and will show antibodies from years earlier
  2. 2. CDC. Laboratory Testing for Epstein-Barr Virus (EBV) (2026)High or elevated antibody levels can persist for years and are not diagnostic of recent infection
  3. 3. Committee for Guidelines for the Management of Chronic Active EBV Disease (Japan MHLW Research Team). Updated guidelines for chronic active Epstein-Barr virus disease (2023)Defines chronic active EBV disease (CAEBV) as requiring confirmation of a high copy number of EBV genome in EBV-infected T or NK cells, a distinct and rare diagnosis
Evidence notes

Tag rationale: C, not borderline. The popular 'chronic/reactivated EBV causes fatigue' construct has no validated criteria linking antibody titres to symptoms in an immunocompetent adult, and EBV seroprevalence is near-universal, so a positive result is the expected finding rather than diagnostic. The label is deliberately distinguished from two real, well-defined diagnoses so it is never used to dismiss genuine illness: acute infectious mononucleosis (common, self-limited, monospot/VCA IgM) and CAEBV (rare, serious, defined in the 2023 updated international guideline by markedly elevated whole-blood EBV DNA and specific clinical/hematologic features). Gap: no direct study found in this session quantifying symptom outcomes in immunocompetent adults labelled with 'chronic EBV' specifically (as opposed to the general seroprevalence and CAEBV literature used here); recorded as a gap rather than treated as separately settled. Wished-for test ids: monospot/heterophile antibody and VCA IgM have no TestSelect entry despite being CONO-orderable (#94) and clinically common; a quantitative EBV DNA PCR entry would also help for the rare CAEBV pathway. Host is 'chronic-fatigue-syndrome' per batch instruction.

Counselling checklist

  • K037 is time-based, billed per half-hour unit or major part thereof: 1 unit needs 20 minutes direct patient contact, 2 units 46 minutes, 3 units 76 minutes. Time must be consecutive, direct patient contact, and excludes chart review or other non-patient-facing time. Start and stop times must be recorded in the patient's permanent record or the service is not payable. No other consultation, assessment, visit, or time-based service is payable the same day, same patient, same physician.

Lines to be added to the copied summary

(none checked yet)

Guidelines

References

  1. [1]NICE NG206 — Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (2021). REVERSED prior guidance: GET not recommended (can harm); CBT supportive not curative; energy management/pacing is the core strategy; PEM cardinal. link
  2. [2]IOM/NAM (2015) — Beyond ME/CFS: Redefining an Illness (SEID criteria: PEM + unrefreshing sleep + cognitive/orthostatic). Canadian Consensus Criteria (2003). Compression-garment RCT for orthostatic intolerance (PMC8781100). link
  3. [3]Systematic review of dietary supplementation for ME/CFS fatigue (2025; high risk of bias) + CoQ10+NADH RCT — best-supported but weak-to-moderate. Bateman Horne / US ME/CFS Clinician Coalition (US pharmacologic reference). link
  4. [4]Nutrition/chronobiology review (fibromyalgia + associated CFS) — balanced nutrition; no evidence for restrictive 'cure' diets; malnutrition risk. CDC ME/CFS provider toolkit. link