The original Aldrete Score is no longer used in post aneshesia care units (PACUs). The last category which addresses color is not a good indicator of oxygenation. The modified Aldrete score is now being used which addresses oxygenation: Oxygen Saturation SpO2 > 92% 2 SpO2 92% or greater with supplemental O2 1 SpO2 supplemental O2 0 A score of 9 or return of pre-anesthesia status is usually required for a patient to be discharged from the PACU. A current post anesthesia book will have an explanation of this scoring system.