Patient education during antenatal care regarding fasting had influence on NPO time of parturients who underwent emergency cesarean section at Ramathibodi Hospital . From July-December 2004, 150 parturients undergoing emergency cesarean section were equally allocated into the informed and non-in-formed groups and randomly interviewed. The study showed that the informed group prepared themselves better than the other group in terms of NPO practice (97.33% VS 57.33%, p < 0.05) and NPO time before operation (13.91 ± 4.54 VS 11.23 ± 5.51 hr respectively, p = 0.0025). After symptoms of labor pain, aminotic fluid leak and bloody show, the informed group fasted longer than non-informed group (9.15 ± 0.21 VS 4.41 ± 3.39 hr, p < 0.05). Patterns of information perception during antenatal care and patient compliance were reviewed and concluded with this study that anesthesiologists could contribute more to parturient cars as multidisciplinary, evidence-based and shared care.