The ALS Functional Rating Scale – Revised (ALSFRS-R) is the most widely used clinical tool for assessing physical function and disease progression in individuals with amyotrophic lateral sclerosis (ALS). It was introduced in 1999 as an update to the original ALSFRS (1991) to better capture respiratory function alongside bulbar and limb domains[1].
Purpose
ALSFRS-R measures functional decline over time, helping clinicians monitor disease progression, guide treatment decisions, and evaluate interventions in clinical trials. It is considered a gold standard for ALS severity assessment[1].
Structure
- 12 items grouped into three functional domains:
- Bulbar: speech, salivation, swallowing
- Motor: handwriting, cutting food, dressing/hygiene, turning in bed, walking, climbing stairs
- Respiratory: dyspnea, orthopnea, respiratory insufficiency[2]
- Each item is scored on a 5-point scale (0–4):
- 0 = no function
- 4 = normal function
- Total score range: 0–48 (higher scores indicate better function)[3].
Clinical Use
- Tracks progression: average decline is about 1 point per month, though individual rates vary[4].
- Used in clinical trials, prognostic modeling, and staging systems like MiToS and King’s staging[3].
Limitations
- Does not fully account for differences in onset type (bulbar vs limb vs respiratory).
- Floor effect in advanced stages; extended versions (ALSFRS-EX) and self-explanatory versions (ALSFRS-R-SE) have been developed to address these issues[3].
For more details, see:
References
[1] resref.com
[2] www.mdcalc.com
[3] en.wikipedia.org
Here’s a detailed ALSFRS-R scoring table showing all 12 items and their 0–4 scoring criteria:
ALSFRS-R Scoring Table
| Domain | Item | Score 4 (Normal) | Score 3 (Mild Impairment) | Score 2 (Moderate) | Score 1 (Severe) | Score 0 (None) |
|---|---|---|---|---|---|---|
| Bulbar | Speech | Normal speech | Detectable speech disturbance | Intelligible with repeating | Speech combined with non-verbal | Loss of useful speech |
| Salivation | Normal | Slight excess saliva | Moderately excessive | Marked drooling | Severe drooling | |
| Swallowing | Normal | Occasional choking | Dietary consistency changes | Needs tube feeding for some | Tube feeding only | |
| Motor – Upper Limb | Handwriting | Normal | Slow or sloppy | Not all words legible | Able to grip pen only | Unable to grip pen |
| Cutting food & handling utensils | Normal | Some difficulty, no help | Needs help for some tasks | Needs help for most tasks | Unable | |
| Dressing & hygiene | Normal | Independent but slow | Needs some assistance | Needs much assistance | Totally dependent | |
| Motor – Lower Limb | Turning in bed | Normal | Somewhat slow | Needs occasional help | Needs frequent help | Unable |
| Walking | Normal | Early ambulation difficulty | Walks with assistance | Non-ambulatory | Unable | |
| Climbing stairs | Normal | Slow or mild difficulty | Needs assistance | Cannot climb stairs | Unable | |
| Respiratory | Dyspnea | None | Occasional shortness of breath | Shortness on exertion | Shortness at rest | Severe at rest |
| Orthopnea | None | Some difficulty lying flat | Needs extra pillows | Cannot lie flat | Unable | |
| Respiratory insufficiency | None | Intermittent BiPAP use | Regular BiPAP use | Continuous BiPAP use | Ventilator dependent |
Total Score Range: 0–48 (higher = better function).