- Clinical Frailty Scale (CFS) tab: Select the single numbered level (1–9) that best describes the patient's overall fitness based on your clinical assessment or the patient's self-report. The CFS is a global clinical judgment scale — choose the level whose description most closely matches the patient's usual daily function, not function during an acute illness.
- Fried Frailty Phenotype tab: Tick each of the five criteria that is present over the past 12 months. The criteria require objective data (grip strength, gait speed, activity survey), but can be approximated from clinical history when formal measurements are unavailable. Total 0 = robust; 1–2 = pre-frail; 3–5 = frail.
- Use Print / Save as PDF to generate a formatted report for the medical record.
- Pair frailty scores with the Charlson Comorbidity Index for a comprehensive prognosis and goals-of-care package.
When to Use
Use these frailty assessment tools when evaluating an elderly patient with CKD G4–G5 or ESKD for whom the benefit-versus-burden balance of dialysis needs to be discussed, or when monitoring functional trajectory in a patient already on hemodialysis or peritoneal dialysis. Frailty is distinct from comorbidity — it captures the patient's physiologic reserve and functional vulnerability, which determine how well they will tolerate the physical and time demands of dialysis.
Appropriate population
Adults aged 60 or older (though frailty can occur earlier in CKD) being evaluated for dialysis initiation, dialysis modality change, or conservative kidney management. Also appropriate for serial reassessment every 6–12 months in elderly dialysis patients to track whether frailty is progressing. Use the CFS when a global clinical impression can be formed from history and physical examination; add the Fried Phenotype when a more objective, criterion-based score is needed for documentation or research.
Limitations
Frailty scores reflect the patient's usual functional state — do not score during an acute illness because illness-related functional decline will artificially inflate the score. The Fried Phenotype requires objective data (grip strength, gait speed, activity level) that may need formal measurement; the tool here uses self-reported or clinician-observed equivalents. Neither instrument alone determines dialysis candidacy — they are decision support tools, not decision makers.
Pearls & Pitfalls
Use both tools together when possible
The CFS is fast and requires only a clinical impression; the Fried Phenotype requires criterion-based data. They measure overlapping but distinct constructs. A patient with a high CFS may score only 1–2 on the Fried scale if physical measurements are near-normal. Use both when documentation is required for a formal goals-of-care conversation or for palliative care referral.
Frailty is reversible at early stages
Pre-frailty (Fried score 1–2) and mild frailty (CFS 5) are potentially reversible with structured exercise (resistance training, walking), protein-rich nutritional support, and optimization of dialysis adequacy and anemia. Identifying frailty early enables proactive rehabilitation rather than just prognostic framing.
Pitfalls
(1) Do not score during an acute hospitalization or illness — functional status is temporarily depressed. Score based on the patient's usual 2-week pre-illness baseline. (2) The CFS is not a substitute for a full geriatric assessment in complex cases — it complements, not replaces, a comprehensive evaluation. (3) A single frailty score should not be used as a hard cutoff to withhold dialysis — it is one input in a shared decision-making process. (4) Frailty scores can change over time; reassess at least annually or after a major illness episode.
Why Use It
Frailty is present in 30–73% of maintenance dialysis patients, depending on the measurement tool and population studied. In elderly patients starting hemodialysis, a Clinical Frailty Scale score of 5 or higher predicts significantly higher 6-month mortality compared with non-frail patients (Hashimoto 2024). The Fried Frailty Phenotype, originally validated in the Cardiovascular Health Study, has been adapted and validated in CKD cohorts — each additional frailty criterion is independently associated with hospitalization, falls, and death. Identifying frailty before dialysis initiation allows the clinical team to set realistic expectations, optimize nutrition and physical rehabilitation, and — where appropriate — discuss conservative kidney management as a legitimate and often palliative alternative.
Frailty Assessment — CFS & Fried Phenotype
Use the tabs to switch between the Clinical Frailty Scale (a global clinical rating) and the Fried Frailty Phenotype (five measurable criteria). Both tools update their interpretation immediately when you make a selection.
Select the single description that best matches the patient's overall status. Base the score on the patient's usual functional state — not on an acute illness episode.
Check each criterion that is present over the past year. Score 0 = Robust, 1–2 = Pre-frail, 3–5 = Frail.
All computation runs in your browser; no values are stored or transmitted.
Next Steps
Use the result to support — not replace — clinical judgment.
- Interpret the value against the targets shown in the calculator and the Evidence section below, in the context of the full clinical picture.
- Trend serial measurements rather than acting on a single result; confirm abnormal or unexpected values before changing management.
- Apply the relevant KDIGO / specialty-guideline threshold and document the indication.
- Escalate or refer to nephrology when results are out of range, rapidly changing, or discordant with the clinical picture — and discuss the implications with the patient.
Evidence & References
Formula & Equations
Clinical Frailty Scale (CFS) — 9-level global rating
| Score | Level | Description | Dialysis implication |
|---|---|---|---|
| 1 | Very Fit | Robust, energetic, exercises regularly; fittest for age | Dialysis well tolerated; full rehabilitation potential |
| 2 | Well | No active disease symptoms; exercises occasionally | Dialysis well tolerated |
| 3 | Managing Well | Medical problems controlled; walks at moderate pace; independent in all ADLs | Dialysis tolerated; monitor functional status |
| 4 | Vulnerable | Not dependent for daily help; symptoms limit activity; often slowed or tired | Dialysis tolerated but monitor for functional decline; exercise and nutrition support recommended |
| 5 | Mildly Frail | Needs help with heavy housework, finances, medications; loses independence with stairs, bathing, going out | Dialysis possible but increased complication risk; shared decision-making essential |
| 6 | Moderately Frail | Needs help with all outside activities and housekeeping; needs help indoors with stairs or bathing | Dialysis high risk; CKM is a legitimate alternative; family discussion strongly recommended |
| 7 | Severely Frail | Completely dependent for personal care; even minor illness causes further decline | Dialysis benefit must be carefully weighed against burden; CKM/comfort care warranted discussion |
| 8 | Very Severely Frail | Completely dependent; approaching end of life; small illnesses can be fatal | Dialysis unlikely to improve quality or quantity of life; comfort-focused approach compassionate |
| 9 | Terminally Ill | Life expectancy <6 months even without kidney failure; not frail per se but applies terminally | Dialysis inappropriate; palliative/comfort care is the compassionate approach |
Fried Frailty Phenotype — 5 criteria (score 0–5)
| Criterion | Operational definition |
|---|---|
| Unintentional weight loss | ≥4.5 kg (10 lbs) in the past year, or self-reported unexplained weight loss |
| Exhaustion / Low energy | Self-report of feeling that everything is an effort or inability to get going (≥3 days per week) |
| Weakness (grip strength) | Low grip strength for sex and BMI: women <17–21 kg, men <26–30 kg (sex/BMI-adjusted cutoffs) |
| Slowness (gait speed) | Slow walking speed on 4-metre walk: >7 seconds (women <159 cm or <60 kg) or >6 seconds (others) |
| Low physical activity | Low weekly energy expenditure: men <383 kcal/week, women <270 kcal/week (MLTA survey) |
| Fried score | Category | Clinical meaning |
|---|---|---|
| 0 | Robust | No frailty criteria met; maintain exercise and nutrition to preserve reserve |
| 1–2 | Pre-frail | Intermediate state; at risk of progression; exercise interventions can reverse pre-frailty |
| 3–5 | Frail | Three or more criteria met; high risk of adverse dialysis outcomes; geriatric assessment and CKM discussion recommended |
Evidence & References
The Clinical Frailty Scale was developed by Rockwood et al. at Dalhousie University and first published in 2005 in the Canadian Study of Health and Aging cohort. An updated 9-level version was published in 2020. In hemodialysis patients, Hashimoto et al. (2024) demonstrated that CFS ≥5 significantly and independently predicted 6-month mortality after dialysis initiation. The Fried Frailty Phenotype was derived from the Cardiovascular Health Study (CHS) by Fried et al. in 2001 and has since been validated in CKD populations, where each additional frailty criterion increases the odds of hospitalisation and death.
- Rockwood K, Song X, MacKnight C, et al. A global clinical measure of fitness and frailty in elderly people. CMAJ. 2005;173(5):489–495.
- Fried LP, Tangen CM, Walston J, et al. Frailty in older adults: evidence for a phenotype. J Gerontol A Biol Sci Med Sci. 2001;56(3):M146–M156.
- Hashimoto S, Nakata H, Imaizumi T, et al. Clinical Frailty Scale predicts 6-month mortality in elderly patients initiating hemodialysis. PLoS ONE. 2024.
- Pereira M, Bittencourt A, de Almeida LM, et al. Frailty and functional dependency in hemodialysis patients. BMC Geriatr. 2024;24:416.
- Kurella Tamura M, Covinsky KE, Chertow GM, Yaffe K, Landefeld CS, McCulloch CE. Functional status of elderly adults before and after initiation of dialysis. N Engl J Med. 2009;361(16):1539–1547.
