Jump to content

Functional Assessment of Chronic Illness Therapy-Fatigue scale


Original Editor - Ajay Upadhyay

Top Contributors - Shailly Yadav, Fasuba Ayobami, Vidya Acharya, Ajay Upadhyay, WikiSysop, Kim Jackson, Lauren Lopez and Alexandra Stead

Introduction

The FACIT-Fatigue is a 13-item, self-report questionnaire that quantifies fatigue severity and its impact on daily activities over the preceding seven days.[1] Developed by Yellen, Cella and colleagues as part of the Functional Assessment of Cancer Therapy (FACT) system,[1] it was later formalised into the FACIT Measurement System.[2] Version 4, the current and most widely used revision, is distributed with official scoring guidance via FACIT.org.[3] It has since been validated well beyond its parent oncology instrument, across a substantial and growing body of studies in oncology, rheumatology, and haematology.[4][5]

Fatigue is common across oncology, rheumatological, musculoskeletal, cardiorespiratory, neurological, and post-viral rehabilitation, and self-report measurement is one of the few practical ways to capture it systematically.[5] The scale captures the experience and functional impact of fatigue - tiredness, weakness, and listlessness, rather than sleepiness, mood, or cognitive fatigue specifically, though scores correlate with related constructs such as vitality and mood.[1][5][6][7] Factor-analytic work supports treating the total score as a single global fatigue domain, even though items can be descriptively split into symptom and impact clusters, so the total score, not sub-scores, is the metric physiotherapists should report and track.[4][6]

Why FACIT-Fatigue matters for physiotherapy

Fatigue is a common symptom encountered by physiotherapists across oncology rehabilitation, rheumatological and musculoskeletal conditions, cardiorespiratory and neurological rehabilitation, and post-viral care, and self-report measurement is one of the few practical ways to capture it systematically.[5][8]

Intended Population

Intended Population and Settings for FACIT-Fatigue

The table below pulls the body of literature reviewed for this page together into an overall picture of where the FACIT-Fatigue is safe to rely on and where it is being used ahead of its evidence.

Evidence tier Conditions Source(s)
Formally validated Cancer (multiple types), rheumatoid arthritis, psoriatic arthritis, axial spondyloarthritis, chronic lymphocytic leukaemia, cold agglutinin disease, iron-deficiency anaemia [6][7][9][10][11][12][13][14][15][16][17]
Used, with supportive but limited validation - neurological conditions Multiple sclerosis, Parkinson's disease, stroke [18][19]
Not established General musculoskeletal outpatients, ME/CFS as a primary diagnostic population, paediatrics, non-condition-specific community rehabilitation No dedicated validation identified in the sources reviewed for this page
Neurological conditions

A validation study by Delgado-Álvarez et al. (2022) found the FACIT-F showed appropriate concurrent validity with the Modified Fatigue Impact Scale and the Fatigue Severity Scale, and was able to distinguish patients with and without fatigue, though the authors noted that FACIT-F itself had not previously been specifically validated in multiple sclerosis (MS).[19] A separate systematic review of self-report fatigue questionnaires in multiple sclerosis, Parkinson's disease, and stroke concluded that the FACIT-F and Fatigue Severity Scale "show promise" specifically in Parkinson's disease, while recommending other instruments as the primary choice in MS as the Unidimensional Fatigue Impact Scale.[18]

A note on long COVID and post-viral fatigue

The FACIT-Fatigue has been used to demonstrate improvements in fatigue following an exercise-based rehabilitation programme in long COVID.[10] This does not amount to formal psychometric validation for this population, and the item set may not fully capture post-exertional malaise.[10] NICE guidance cautions against generic exercise-based advice where post-exertional malaise (PEM) overlap is suspected.[20] Pair the FACIT-Fatigue with a measure such as the DePaul Symptom Questionnaire, and screen for PEM before progressing exercise load.[10][20]

Method of Use

FACIT-Fatigue Structure and Scoring

All 13 items use a five-point Likert response format over a 7-day recall period, rated from 0 = Not at all to 4 = Very much.[3]

Item cluster Items What it captures
Symptom subscale 5 items Direct experience of tiredness, weakness, and fatigue[6]
Impact subscale 8 items Effect of fatigue on activity, work, social function, and need to rest[6]
Total scale 13 items Overall fatigue severity and impact (reported metric)[4][6]

Reverse Scoring

Out of the thirteen items, eleven (items 1-6 and 9-13) are worded negatively and need to be scored in reverse. Items 7 and 8 are already phrased in a positive manner, so they will remain unchanged. Once reverse-scoring is applied, all items will align in the same direction across the scale: 0 indicates the worst and 4 signifies the best.[3] Although most electronic versions and the official FACIT scoring rules handle this phase automatically, it is known to be a cause of scoring error in manual administration.[3]

Figure 1. Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F) Scale (Version 4) as depicted in the Hartford Institute for Geriatric Nursing (HIGN) "Try This" assessment series.[21]

Calculating the Total Score

Scoring formula: Total score = 13 × (sum of item scores ÷ number of items answered).[3]

This pro-rating formula allows a valid score to be calculated when a small number of items are missing.[3] Official guidance permits scoring provided at least 7 of the 13 items (>50%) are completed; with fewer valid responses, the total score should not be calculated.[3] 

Worked example: A patient answers all 13 items. After reverse-scoring items 1–6 and 9–13, the 13 item scores sum to 34 (out of a possible 52). Applying the formula: 13 × (34 ÷ 13) = 34. Because all 13 items were answered, the pro-rating step doesn't change the result here — it only affects the score when one or more items are left blank. If, instead, only 10 items had been answered summing to 27, the score would be 13 × (27 ÷ 10) = 35.1, rescaled to what the full 13-item score would be expected to look like.
Interpreting the score

The score range is 0–52, with higher scores indicating less fatigue, and a general (non-clinical) population mean of approximately 43 has been reported.[3][6] Several disease-specific severity bandings and cut-points exist in the literature, but none is universal.[5] As one illustration, a validation study in axial spondyloarthritis proposed bands of severe (≤21), moderate (22-30), mild (31-40), and none/minimal (>40).[9] Separately, oncology literature has used cut-points below 30 and below 34 to flag clinically significant fatigue, with both cut-offs supported by cluster analysis in a chronic lymphocytic leukaemia sample; the FACIT Group itself does not endorse a single specific cut-off.[5][6] A long COVID rehabilitation cohort used a comparable but not identical set of bands (very severe 0-20, severe 21-30, moderate 31-40, mild 41-52), which is a useful reminder that bandings are study-specific rather than fixed to the scale itself (see the long COVID section below for more detail on this study).[10]

Evidence for FACIT-Fatigue

The FACIT-Fatigue is one of the more thoroughly psychometrically tested fatigue measures in clinical use, with evidence drawn from multiple disease-specific validation studies.[5] Structural validity work supports a single global fatigue factor while also allowing a descriptive symptom/impact item split.[4][6] Because the Minimal Clinically Important Difference (MCID) is derived using anchor-based and/or distribution-based statistical methods applied to a specific patient sample, it is population- and study-dependent rather than a single fixed constant for the scale.[14]

Reliability

Internal consistency (Cronbach's alpha) has been reported at 0.86-0.87 in a 636-patient rheumatoid arthritis validation trial,[11] at or above 0.90 in psoriatic arthritis,[12] at approximately 0.93 in iron-deficiency anaemia,[7] and at 0.94-0.96 in cold agglutinin disease.[13] Test-retest reliability, expressed as an intraclass correlation coefficient, has been reported at 0.87 in iron-deficiency anaemia[7] and at or above 0.80 in psoriatic arthritis.[12]

Validity

Convergent validity against the SF-36/SF-12 Vitality domain has been reported at r = 0.73-0.84 in rheumatoid arthritis,[11] r = 0.74 in iron-deficiency anaemia,[7] and above r = 0.80 in psoriatic arthritis.[12] The scale has also shown concurrent validity against the Profile of Mood States-Fatigue subscale (r = -0.92), the Brief Fatigue Inventory (r = -0.88), and the Fatigue Severity Scale (r = -0.767) in oncology samples.[5] Known-groups validity has been demonstrated using American College of Rheumatology response criteria in rheumatoid arthritis,[11] between haemoglobin-responder and non-responder groups in cold agglutinin disease,[13] and between high- and low-haemoglobin groups in iron-deficiency anaemia.[7]

Responsiveness

Responsiveness to change has been shown following haemoglobin correction in anaemia,[7] following exercise-training interventions in lung, colorectal, and prostate cancer,[5] and following an exercise-based rehabilitation programme in long COVID (see Intended Population above for detail).[10]

Limitations

Several limitations can temper how much weight is placed on a single FACIT-Fatigue score:

  • Self-report bias- Scores reflect the patient's perception and recall of the past week and can be influenced by mood, expectation, and context, as with any patient-reported outcome measure.[1]
  • Not diagnostic -The FACIT-Fatigue quantifies fatigue severity and impact; it does not identify the underlying cause, which requires separate clinical assessment.[1][6]
  • Cross-condition MCID is not interchangeable - figures range from roughly 2.4 to 11 points depending on population and method.[14]
  • Limited MSK-specific, paediatric, and long COVID evidence - no dedicated validation for general musculoskeletal outpatient or paediatric populations was identified, and long COVID studies using the scale have stopped short of claiming formal validation in that population.[10][18][19] In practice, this means physiotherapists working with general MSK caseloads where fatigue is not the primary presenting complaint (e.g. most orthopaedic, sports, or spinal outpatient work) should be cautious about relying on the FACIT-Fatigue as a primary outcome measure, and may be better served by one of the alternative measures listed above, or by using the FACIT-Fatigue only as a secondary, exploratory measure alongside condition-specific tools.

Clinical Reference

Using the FACIT-Fatigue in physiotherapy practice

  • Clinical reasoning at initial assessment: A baseline score below the population norm (~43) or a disease-relevant threshold supports flagging fatigue explicitly in the problem list.[1][6]
  • Monitoring outcomes over time: The brief, stable 7-day recall window suits repeated administration across a programme; use a disease-matched MCID where one exists to judge meaningful change.[5][10]
  • Shared decision-making and goal setting: A validated self-report score gives patients a concrete way to communicate fatigue and supports conversations about exercise dosage, pacing, and goal-setting.[1][2]
  • Triangulating with objective measures: The FACIT-Fatigue captures perceived fatigue only, not exercise capacity or physiological fatigability, so pairing it with an objective measure (e.g. shuttle walk test, haemoglobin) gives a fuller picture.[1][6][7][10]

Alternative Outcome Measures

Because the FACIT-F's evidence base varies by condition, it is not always the best-fit fatigue measure, particularly outside oncology, rheumatology, and haematology.[18] Physiotherapists should match the tool to the construct and population being assessed. The options below are commonly used alternatives, each suited to a different context:

  1. Fatigue Severity Scale (FSS) - a brief, widely used 9-item scale; recommended alongside FACIT-Fatigue specifically in Parkinson's disease.[18][8]
  2. Modified Fatigue Impact Scale (MFIS) - captures physical, cognitive, and psychosocial fatigue impact; validated for use in multiple sclerosis.[19]
  3. DePaul Symptom Questionnaire (PEM module)- the preferred tool for screening post-exertional malaise in long COVID or ME/CFS presentations.[10]
  4. Multi-Dimensional Fatigue Inventory (MFI) - separates fatigue into general, physical, and mental dimensions.[8]
  5. Pediatric Quality Of Life (PedsQL) - used where the FACIT-Fatigue's adult-normed item set is not appropriate, i.e. in paediatric populations.[8]
  6. Short Form 36 Vitality Subscale- a brief single-domain proxy for fatigue-related vitality, useful when a full fatigue-specific tool isn't feasible.[8]
  7. Visual Analog Scales (VAS)-a simple, fast single-item option for tracking fatigue session-to-session. [8]

Conclusion

The FACIT-Fatigue gives physiotherapists a brief, well-studied way to put a number on fatigue, a symptom that is otherwise hard to pin down.[1][3] Used consistently, it turns a vague complaint of tiredness into something that can be tracked across a programme and discussed openly with the patient as an effective tool to support clinical reasoning, monitor change over a programme, and structure shared conversations about pacing and goals for managing fatigue.[5] It works best alongside an objective measure, not in place of one, and its real value lies in supporting the conversation around progress rather than standing in for clinical judgement.[6][10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Yellen SB, Cella DF, Webster K, Blendowski C, Kaplan E. Measuring fatigue and other anemia-related symptoms with the Functional Assessment of Cancer Therapy (FACT) measurement system. J Pain Symptom Manage. 1997;13(2):63–74.
  2. ↑ 2.0 2.1 Webster K, Cella D, Yost K. The Functional Assessment of Chronic Illness Therapy (FACIT) Measurement System: properties, applications, and interpretation. Health Qual Life Outcomes. 2003;1:79
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 FACIT.org. FACIT-Fatigue Scale (Version 4), English (Universal): administration and scoring guidelines [Internet]. Elmhurst (IL): FACIT.org; 2007 [cited 2026 Jul 19]. Available from: https://www.facit.org
  4. ↑ 4.0 4.1 4.2 4.3 Cella D, Lai JS, Stone A. Self-reported fatigue: one dimension or more? Lessons from the Functional Assessment of Chronic Illness Therapy–Fatigue (FACIT-F) questionnaire. Support Care Cancer. 2011;19(9):1441–50.
  5. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 Ilsley T, Howden EJ. Clinimetrics: Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-Fatigue). J Physiother. 2023;69(4):232–9.
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 Eek D, Ivanescu C, Corredoira L, Meyers O, Cella D. Content validity and psychometric evaluation of the Functional Assessment of Chronic Illness Therapy-Fatigue scale in patients with chronic lymphocytic leukemia. J Patient Rep Outcomes. 2021;5(1):27.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Acaster S, Dickerhoof R, DeBusk K, Bernard K, Strauss W, Allen LF. Qualitative and quantitative validation of the FACIT-fatigue scale in iron deficiency anemia. Health Qual Life Outcomes. 2015;13:60.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Hewlett S, Dures E, Almeida C. Measures of fatigue: Bristol Rheumatoid Arthritis Fatigue Multi-Dimensional Questionnaire (BRAF MDQ), Bristol Rheumatoid Arthritis Fatigue Numerical Rating Scales (BRAF NRS) for severity, effect, and coping, Chalder Fatigue Questionnaire (CFQ), Checklist Individual Strength (CIS20R and CIS8R), Fatigue Severity Scale (FSS), Functional Assessment Chronic Illness Therapy (Fatigue) (FACIT-F), Multi-Dimensional Assessment of Fatigue (MAF), Multi-Dimensional Fatigue Inventory (MFI), Pediatric Quality Of Life (PedsQL) Multi-Dimensional Fatigue Scale, Profile of Fatigue (ProF), Short Form 36 Vitality Subscale (SF-36 VT), and Visual Analog Scales (VAS). Arthritis Care Res (Hoboken). 2011;63 Suppl 11:S263-86.
  9. ↑ 9.0 9.1 Cella D, de la Loge C, Fofana F, Guo S, Ellis A, Fleurinck C, et al. The Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-Fatigue) scale in patients with axial spondyloarthritis: psychometric properties and clinically meaningful thresholds for interpretation. J Patient Rep Outcomes. 2024;8(1):92.
  10. ↑ 10.00 10.01 10.02 10.03 10.04 10.05 10.06 10.07 10.08 10.09 10.10 Daynes E, Baldwin MM, Annals M, Gardiner N, Chaplin E, Ward S, et al. Changes in fatigue symptoms following an exercise-based rehabilitation programme for patients with long COVID. ERJ Open Res. 2024;10(4):00089-2024.
  11. ↑ 11.0 11.1 11.2 11.3 Cella D, Yount S, Sorensen M, Chartash E, Sengupta N, Grober J. Validation of the Functional Assessment of Chronic Illness Therapy Fatigue Scale relative to other instrumentation in patients with rheumatoid arthritis. J Rheumatol. 2005;32(5):811–9.
  12. ↑ 12.0 12.1 12.2 12.3 Cella D, Wilson H, Shalhoub H, Revicki DA, Cappelleri JC, Bushmakin AG, et al. Content validity and psychometric evaluation of Functional Assessment of Chronic Illness Therapy-Fatigue in patients with psoriatic arthritis. J Patient Rep Outcomes. 2019;3(1):30.
  13. ↑ 13.0 13.1 13.2 Cella D, Hill QA, Karaouni A, Joly F, Sourdille T, Shafer F, et al. FACIT-Fatigue scale in patients with cold agglutinin disease: psychometric validation and estimation of clinically meaningful change. Front Hematol. 2025;4:1490130.
  14. ↑ 14.0 14.1 14.2 Cella D, Eton DT, Lai JS, Peterman AH, Merkel DE. Combining anchor and distribution-based methods to derive minimal clinically important differences on the Functional Assessment of Cancer Therapy (FACT) anemia and fatigue scales. J Pain Symptom Manage. 2002;24(6):547–61.
  15. ↑ Fabi A, Hager S, Lourdes L, Gandini C, Gavioli EM, Wakade R, et al. Validation of the FACIT-Fatigue scale in patients with locally advanced or metastatic breast cancer. Oncologist. 2025;30(10):oyaf292.
  16. ↑ Pouchot J, Kherani RB, Brant R, Lacaille D, Lehman AJ, Ensworth S, et al. Determination of the minimal clinically important difference for seven fatigue measures in rheumatoid arthritis. J Clin Epidemiol. 2008;61(7):705–13.
  17. ↑ Kiss F, Farkas N, Nagy G, Minier T, Kumánovics G, Faludi R, et al. Minimal clinically important differences (MCID) for the Functional Assessment of Chronic Illness Therapy Fatigue Scale in patients with systemic sclerosis. Int J Environ Res Public Health. 2023;20(1):771.
  18. ↑ 18.0 18.1 18.2 18.3 18.4 Elbers RG, Rietberg MB, van Wegen EEH, Verhoef J, Kramer SF, Terwee CB, et al. Self-report fatigue questionnaires in multiple sclerosis, Parkinson's disease and stroke: a systematic review of measurement properties. Qual Life Res. 2012;21(6):925–44.
  19. ↑ 19.0 19.1 19.2 19.3 Delgado-Álvarez A, Matías-Guiu JA, Delgado-Alonso C, Cuevas C, Palacios-Sarmiento M, Vidorreta-Ballesteros L, et al. Validation of two new scales for the assessment of fatigue in multiple sclerosis: F-2-MS and FACIT-F. Mult Scler Relat Disord. 2022;63:103826.
  20. ↑ 20.0 20.1 National Institute for Health and Care Excellence. COVID-19 rapid guideline: managing the long-term effects of COVID-19 [NG188] [Internet]. London: NICE; 2020 Dec 18 [updated 2024; cited 2026 Jul 19]. Available from: https://www.nice.org.uk/guidance/ng188
  21. ↑ Hartford Institute for Geriatric Nursing, New York University Rory Meyers College of Nursing. Try This: General Assessment Series No. 30. Functional Assessment of Chronic Illness Therapy–Fatigue (FACIT-F) Scale (Version 4). New York (NY): Hartford Institute for Geriatric Nursing; 2020. Available from: https://hign.org/sites/default/files/2020-06/Try_This_General_Assessment_30.pdf
Retrieved from "https://www.physio-pedia.com/w/index.php?title=Functional_Assessment_of_Chronic_Illness_Therapy-Fatigue_scale&oldid=383012"