ALS Functional Rating Scale Revised (ALSFRS-R)

The ALSFRS-R is a 12-item clinician-administered functional rating scale designed to assess disease progression and functional status in amyotrophic lateral sclerosis (ALS). Introduced by Cedarbaum and colleagues in 1999, it expands upon the original ALSFRS by incorporating respiratory function assessment. It is the primary outcome measure in ALS clinical trials and routine clinical monitoring, providing quantitative tracking of disease decline that predicts survival and guides management decisions.