Evaluation of the Quantra QStat System in Obstetric Patients

Inclusion Criteria: * Subject is \> 18 years. * Subject is pregnant or at least 24 h postpartum * Subject is fluent in English language. * Subject is experiencing significant bleeding resulting in activation of the stage 2 OB hemorrhage protocol as defined by blood loss ≥1500ml at delivery or within the first 24 hours after delivery, and/or is hemodynamically unstable and/or is experiencing increased abnormal bleeding not responsive to OB stage 1 hemorrhage resuscitation. * Subject or subject's legally authorized representative (LAR) is willing to provide informed consent, either prospectively or by deferred consent. Exclusion Criteria: * Subject is incarcerated at the time of the study. * Subject is currently enrolled in a distinct study that might confound the results of the proposed study * Subject is affected by a condition that, in the opinion of the clinical team, may pose additional risks