The QBL Paradox: Precision vs. Performance in OB Hemorrhage

Today, we are taking a deep dive into an intervention that almost every labor and delivery unit in North America has adopted over the last decade: Quantitative Blood Loss, or QBL. ACOG first recommended quantitative blood loss assessment in Committee Opinion Number 794, published in December 2019. This opinion recommended that every birthing facility implement a standardized, quantitative method for measuring cumulative blood loss at all deliveries, replacing visual estimation as the default approach. This built on earlier ACOG efforts, including the 2015 reVITALize initiative, which standardized obstetric data definitions and defined postpartum hemorrhage using cumulative measured blood loss thresholds (≥1,000 mL regardless of delivery route, or blood loss accompanied by signs/symptoms of hypovolemia). We’ve all weighed sponges, measured calibrated drapes, and run the math. But here’s the million-dollar question: Does measuring blood loss accurately, on its own, actually improve outcomes for patients? The answer is YES….and NO at the same time. Listen in for details as we discuss new data (July 2026 in AJOG) on this topic.

1. White A, Burns RN, Pruszynski JE, Ravindra D, Fin KX, Montgomery T, Jestes E, Ambia AM, Anyaehie B, Duryea EL. Establishing Normal Blood Loss Thresholds at the Time of Delivery Based on Quantitative Blood Loss. Am J Obstet Gynecol. 2026 Jul. DOI: 10.1016/j.ajog.2026.07.028. S0002-9378(26)00395-9. YMOB 16849.

2. Quantitative Blood Loss in Obstetric Hemorrhage: ACOG COMMITTEE OPINION, Number 794.Obstetrics and Gynecology. 2019. Committee on Obstetric Practice

3. Coomarasamy A, Devall AJ, Bell S, et al. Diagnosis and Treatment of Postpartum Haemorrhage: A Race Against Time. Lancet. 2026.