Introduction: Obstetric early warning score (OEWS) has been used conventionally for early identification of deteriorating obstetric patients in the labor room and ward settings. This study was conducted to determine if this simple clinical score could be used for prognosticating a critically ill patient in the ICU setting instead of sequential organ failure assessment score (SOFA) and acute physiology and chronic health evaluation (APACHE II) score. Materials and Methods: A cohort study was conducted at Obstetrics Critical Care Unit, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi. A total of 250 obstetric patients were recruited after informed consent. The OEWS, SOFA, and APACHE II scores were calculated within 24 hours of admission. The patients were followed to study the maternal outcome. Results: The area under receiver operator characteristic (AUROC) curve of OEWS, SOFA, and APACHE II for prediction of maternal mortality was 0.894 (95% CI, 0.849–0.929), 0.924 (95% CI, 0.884–0.954), and 0.93 (95% CI, 0.891–0.958), respectively. The standardized mortality ratio (SMR) for OEWS, SOFA, and APACHE II was 66.3, 62.5, and 69.15%, respectively. Conclusion: Obstetric early warning score is as effective as the conventional SOFA and APACHE II to prognosticate the obstetric patient. Since OEWS is based only on clinical criteria, it can be done immediately on admission and can help in early allocation of appropriate manpower and resources for optimum outcome. Clinical significance: The clinical application of this study will help intensivists to prognosticate the critically ill obstetric patients immediately following admission to the critical care unit.
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