Table 1. OASS SCALE: Observer’s Assessment of Alertness/Sedation Scale.

Responsiveness	Speech	Facial Expression	Eyes	Composite Score
Responds readily to name spoken in a normal tone	Normal	Normal	Clear, no ptosis	5 (alert)
Lethargic response to name spoken in a normal tone	Mild slowing or thickening	Mild relaxation	Glazed or mild ptosis (less than half the eye)	4
Responds only after name is called loudly or repeatedly	Slurring or prominent slowing	Marked relaxation (slacked jaw)	Glazed or marked ptosis (half the eye or more)	3
Responds only after mild prodding or shaking	Few recognizable words			2
Does not respond to mild prodding or shaking				1 (sleep)