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Fluid responsiveness assessments have shown to be an important matter in perioperative fluid optimization. Respiratory variations in pulse oximetry plethysmographic waveform amplitude (∆POP) and passive leg raising have been shown as promising indicators due to the ability to predict fluid responsiveness. The aim of this study was to assess the effect of passive leg raising (PLR) on ∆POP to predict fluid responsiveness in mechanically ventilated patients after induction of general anesthesia. This was a trialon 30 patients referred for surgery under general anesthesia, aged 18–60 years and ASA physical status I or II, during the period of February–March 2015 at the Central Surgical Installation of Dr. Hasan Sadikin General Hospital Bandung. Patients were studied immediately after the induction of general anesthesia. This trial use the paired t test, Wilcoxon test, and ANOVA for statistical analysis. Vital signs and ∆POP were recorded at baseline, before, and after PLR. PLR induced changes in ∆POP with a ∆POP greater than 13% compared to the initial PLR allowed discrimination between responders and nonresponders to 6/30. There was a significant decrease in ∆POP in responders when compared to the nonresponders(p<0.05). ∆POP can be reduced by PLR and fluid responsiveness can be predicted noninvasively in mechanically ventilated patients during general anesthesia.