Fatigue Severity Scale
The Fatigue Severity Scale is a brief self-report of fatigue impact. This page is for clinics. It is not a diagnosis of a sleep or medical disorder and not a public test.
Overview
What is the FSS?
The FSS asks about fatigue severity and interference. Fatigue has many medical, psychiatric, and sleep-related causes, so a score is not a diagnosis. It is also listed among blood-testing-adjacent symptom measures because fatigue is reviewed before laboratory work, not because it orders tests.
Development and clinical use
Krupp and colleagues published the FSS as a fatigue-severity instrument. Confirm current official materials before using it in a live pathway.
- Catalogue status
- Educational entry
- Production scoring
- Not independently verified
- Mode
- self-report
- Typical use
- Clinician-reviewed intake
- Clinical role
- Fatigue-impact screening support
Administration
A focused client experience
FSS is completed as a focused self-report and stored for clinician review. This public page does not collect answers or return a score.
- One question at a time with visible progress
- Large keyboard-operable response choices
- Previous, next, and answer-review steps
- Clear confirmation that results go to the clinic
The illustration shows layout only. It does not reproduce FSS item wording.
Report showcase
Designed to make evidence easy to review
The downloadable synthetic example illustrates report layout using invented response patterns, without patient data or instrument questions.
- Named instrument, version, and provenance
- Item-level response pattern without source wording
- Methodology, references, and clinical boundary
- Responsible clinician review rather than automated conclusions
Clinician review required
Methodology
Understand the measure and its scoring conventions
Published scoring conventions may exist in official materials. This public page does not independently verify scoring, cutoffs, or a production scoring rule. Use the official form and scoring instructions for the version you intend to use.
References
- Original FSS paperKrupp LB et al. The Fatigue Severity Scale. Arch Neurol. 1989;46(10):1121-1123.
Questions
What clinics ask before they evaluate the FSS
These answers stay inside educational catalogue scope. They do not replace official manuals or clinician judgement.
Does FSS diagnose chronic fatigue or sleep apnoea?
No. It is a fatigue-impact self-report. Diagnosis remains a clinician task.
Can I complete FSS here?
No. This page does not collect answers or recommend blood tests.
How is FSS used on Lirena?
As a sleep and general-intake self-report. Clinicians review the result with history rather than treating a score as a diagnosis.
Does FSS determine which blood tests to order?
No. Symptom questionnaires on Lirena do not order or select laboratory tests.