Functional Ambulation Category
Also written as: FAC — Functional Ambulation Category
A six-point ordinal scale (0–5) used in rehabilitation to classify a patient's walking ability based on physical assistance requirements and terrain type.
Full Definition
The Functional Ambulation Category (FAC) is a validated clinical scale that rates ambulatory ability from 0 (non-functional ambulation) to 5 (independent ambulation on all surfaces including stairs). It is frequently used alongside K-Level classifications in prosthetics documentation to quantify rehabilitation progress and to justify component upgrades in insurance submissions. Editors should note that FAC scores are written as numerals (FAC 3, not FAC three) and that the scale was developed for stroke rehabilitation but has been widely adopted in prosthetics outcome measurement. It should not be conflated with the Medicare K-Level system, which is a separate classification framework.
Usage
Usage note: Write as 'FAC' (expand on first use). Score numerals are written as digits: 'FAC 4,' not 'FAC four.' Do not use interchangeably with K-Level, which is a separate system used specifically for Medicare reimbursement decisions.
In Context
- "The rehabilitation outcome report recorded a baseline FAC score of 2, improving to FAC 4 at six-month follow-up with the prosthetic limb." — Rehabilitation outcome report
- "The editor queried whether 'K3' had been confused with 'FAC 3' in the insurance justification letter, as the two scales measure different constructs." — Editorial query log