Barthel Index (BI) — Activities of Daily Living Assessment
The Barthel Index is a simple, valid, and reliable instrument for measuring functional independence in activities of daily living (ADLs). It is one of the most widely used functional assessment tools in rehabilitation medicine, geriatrics, and stroke research.
About
The Barthel Index was originally developed by Mahoney and Barthel in 1965 as a simple index of independence for scoring the ability of patients with chronic conditions to care for themselves. It assesses 10 basic ADLs: feeding, bathing, grooming, dressing, bowels, bladder, toilet use, transfers (bed to chair), mobility, and stairs. Each item is scored based on the amount of physical assistance required. Scores range from 0 (completely dependent) to 100 (completely independent). The Barthel Index has excellent inter-rater reliability (kappa 0.84-0.97), test-retest reliability (r = 0.99), and is available in multiple languages. It is recommended by NICE (UK) and the American Heart Association for stroke rehabilitation assessment.
Formula
10 items scored by level of assistance needed: feeding (0, 5, 10), bathing (0, 5), grooming (0, 5), dressing (0, 5, 10), bowels (0, 5, 10), bladder (0, 5, 10), toilet use (0, 5, 10), transfers (0, 5, 10, 15), mobility (0, 5, 10, 15), stairs (0, 5, 10). Total = sum of all items (range 0-100).
The Barthel Index is scored as follows: feeding (0 = unable, 5 = needs help, 10 = independent), bathing (0 = dependent, 5 = independent), grooming (0 = needs help, 5 = independent), dressing (0 = dependent, 5 = needs help but can do half, 10 = independent), bowels (0 = incontinent, 5 = occasional accident, 10 = continent), bladder (0 = incontinent/catheterized, 5 = occasional accident, 10 = continent), toilet use (0 = dependent, 5 = needs some help, 10 = independent), transfers (0 = unable, 5 = major help, 10 = minor help, 15 = independent), mobility (0 = immobile, 5 = wheelchair independent, 10 = walks with help, 15 = independent), stairs (0 = unable, 5 = needs help, 10 = independent).
Score Interpretation
The Barthel Index is one of the most widely validated functional assessment tools in clinical medicine. A score of 60-80 has been proposed as a threshold for discharge to community living. The MCID is 2-3 points in acute stroke and 10 points in chronic conditions. The Barthel Index is a predictor of length of stay, discharge destination, and survival in older adults and stroke patients. It is recommended by NICE for functional assessment in stroke care.
Independent — Minimal Assistance — 80+
Patient can perform most ADLs independently. May need assistance with complex tasks.
Management: Independent living possible. Consider outpatient or home therapy.
Moderate Dependence — 60–79
Patient needs assistance with some ADLs but is not completely dependent.
Management: Inpatient rehabilitation or community support services recommended.
Severe Dependence — 40–59
Patient requires assistance with most daily activities.
Management: Skilled nursing or long-term care facility likely needed.
Total Dependence — 0–39
Complete functional dependence requiring 24-hour care.
Management: 24-hour nursing care. Long-term care facility placement.
Reference Ranges
| Population | Normal Range |
|---|---|
| Stroke rehabilitation | Mean admission 40-50, mean discharge 65-75 |
| Community-dwelling older adults (80+) | Median BI 95-100 |
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View medical review board & editorial policy →Example Calculation
A 72-year-old woman recovering from hip fracture: feeding 10 (independent), bathing 0 (dependent on bed bath), grooming 5 (independent), dressing 5 (needs help with socks/shoes), bowels 10 (continent), bladder 10 (continent), toilet 5 (needs help), transfers 10 (minor help), mobility 10 (walks with walker), stairs 0 (unable). Total: 65/100 — Moderate dependence. Rehabilitation target: achieve 80+ for safe discharge home.
Common Mistakes
Scoring what the patient could do before illness rather than current performance.
The Barthel Index reflects current actual performance, not potential or pre-morbid function. Score based on what the patient actually does in their current environment over the preceding 24-48 hours.
Frequently Asked Questions
What is the difference between the Barthel Index and the Modified Barthel Index?
How does Barthel Index compare with FIM?
Can the Barthel Index be used for community-dwelling older adults?
References
- Mahoney FI, Barthel DW. Functional evaluation: the Barthel Index. Md State Med J. 1965;14:61-65.
- Collin C, Wade DT, Davies S, Horne V. The Barthel ADL Index: a reliability study. Int Disabil Stud. 1988;10(2):61-63.
- NICE Guideline NG128: Stroke Rehabilitation in Adults (2023).
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