C6LF is a screening tool used to determine if a patient may be having a large vessel stroke.
C = Cortical signs (mild or severe aphasia; neglect; gaze deviation; visual field deficit)
6 = NIHSS score of 6 or greater
L = Acute loss of consciousness without recovery
F = Symptoms fluctuating in severity
Each item is worth 1 point when positive. A score of 1 or greater is a possibility of a large vessel stroke.