Functional Independence Measure (FIM) — Rehabilitation Assessment
The Functional Independence Measure (FIM) is a standardized assessment tool used to measure the severity of disability and functional status in patients undergoing medical rehabilitation. It evaluates 18 functional items across 6 domains on a 7-level scale.
About
The FIM was developed by the Uniform Data System for Medical Rehabilitation (UDSMR) as part of the Functional Independence Measure Assessment System. It consists of 18 items: 13 motor items (scored 13-91) covering self-care, sphincter control, transfers, and locomotion, and 5 cognitive items (scored 5-35) covering communication, social cognition, and memory. Each item is rated on a 7-point ordinal scale from 1 (total assistance) to 7 (complete independence). The FIM is the most widely used functional assessment instrument in inpatient rehabilitation facilities worldwide and is mandated by Medicare for IRF-PAI reporting in the United States.
Formula
Each item scored 1-7: 7 = complete independence, 6 = modified independence (device), 5 = supervision/cueing, 4 = minimal contact assist (75%+ independence), 3 = moderate assist (50-74%), 2 = maximal assist (25-49%), 1 = total assist (<25%). Motor subscore (13 items): 13-91. Cognitive subscore (5 items): 5-35. Total FIM: 18-126.
The FIM is divided into two subscales. Motor FIM (13 items, score 13-91): eating, grooming, bathing, dressing upper body, dressing lower body, toileting, bladder management, bowel management, bed/chair/wheelchair transfer, toilet transfer, tub/shower transfer, walk/wheelchair locomotion, and stairs. Cognitive FIM (5 items, score 5-35): comprehension, expression, social interaction, problem-solving, and memory. The total FIM score ranges from 18 (complete dependence) to 126 (complete independence). FIM efficiency (change in FIM score per day) is a key outcome metric in rehabilitation programs.
Score Interpretation
The FIM is the most widely used measure of functional status in rehabilitation medicine. FIM efficiency (change in score per day) is a key quality metric for inpatient rehabilitation facilities. The minimal clinically important difference (MCID) is 22 points for total FIM in stroke rehabilitation. FIM scores predict discharge disposition, length of stay, and community integration after rehabilitation.
Complete Independence — 108+
Patient independent in all functional areas. Modified independence possible with devices.
Management: Discharge to community. Outpatient rehabilitation if needed.
Modified Independence to Supervision — 72–107
Minimal to moderate assistance needed for some tasks. Requires supervision for safety.
Management: Continue inpatient rehabilitation. Discharge planning with family training.
Moderate to Maximal Assistance — 36–71
Significant assistance required for most daily activities.
Management: Intensive inpatient rehabilitation program. Skilled nursing facility may be needed.
Total Assistance Required — 18–35
Complete dependence on caregivers for all functional activities.
Management: 24-hour nursing care. Long-term care facility placement consideration.
Reference Ranges
| Population | Normal Range |
|---|---|
| Acute stroke rehabilitation admission | Mean admission FIM 56-65, mean discharge FIM 86-95 |
| Spinal cord injury rehabilitation | Paraplegia mean admission 72, tetraplegia mean admission 38 |
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A 68-year-old stroke patient: After 3 weeks of inpatient rehabilitation, motor FIM = 62/91 (eating 5, grooming 5, bathing 4, dressing upper 5, dressing lower 4, toileting 5, bladder 6, bowel 6, bed transfer 5, toilet transfer 5, tub transfer 4, walk 4, stairs 3) and cognitive FIM = 28/35 (comprehension 6, expression 5, social 6, problem-solving 5, memory 6). Total FIM: 90/126 — Modified independence to supervision.
Common Mistakes
Scoring the patient based on performance in their home environment rather than in the clinical setting.
The FIM should be scored based on the patient's typical performance in the clinical setting during the rating period (usually 24-72 hours). If performance varies, use the lower (more dependent) score.
Frequently Asked Questions
What is the difference between FIM and Barthel Index?
How is FIM used for rehabilitation program evaluation?
Can the FIM be used for children?
References
- Keith RA, Granger CV, Hamilton BB, Sherwin FS. The functional independence measure: a new tool for rehabilitation. Adv Clin Rehabil. 1987;1:6-18.
- Uniform Data System for Medical Rehabilitation. FIM Instrument: Scoring Guide. 2024.
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