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Table 3 Observer’s Assessment of Alertness/Sedation scale

From: Relation between fentanyl dose and patient state index during spinal anesthesia for elective cesarean section

Score level Responsiveness
5 Responds readily to name spoken in a normal tone
4 Lethargic response to name spoken in a normal tone
3 Responds only after name is called loudly and/or repeatedly, or lash reflex is present
2 Loss of lash reflex or has a positive response to train-of-four (TOF) stimulation
1 No purposeful response to TOF stimulation