| Organization | Definition of PPH |
| World Health Organization[1] | - Blood loss ≥500 mL within 24 hours after birth.
- Severe PPH: Blood loss ≥1000 mL within the same time frame.
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| American College of Obstetricians and Gynecologists[2] | - Cumulative blood loss ≥1000 mL or blood loss accompanied by signs or symptoms of hypovolemia within 24 hours after the birth process (includes intrapartum loss) regardless of route of delivery.
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| Royal College of Obstetricians and Gynaecologists[3] | - Minor PPH (500 to 1000 mL) and major PPH (>1000 mL). Subdivisions of major PPH include moderate (1001 to 2000 mL) or severe (>2000 mL).
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| International expert panel[4] | - Active bleeding >1000 mL within the 24 hours following birth that continues despite the use of initial measures, including first-line uterotonic agents and uterine massage.
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| Society of Obstetricians and Gynaecologists of Canada[5] | - Any amount of bleeding that threatens the patient's hemodynamic stability.
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| California Maternal Quality Care Collaborative[6] | - Stage 0: Every woman in labor/giving birth.
- Stage 1: Blood loss >500 mL after vaginal or >1000 mL after cesarean delivery; or change in vital signs >15% or heart rate ≥110 beats/minute, blood pressure ≤85/45 mmHg, O2 saturation <95%.
- Stage 2: Continued bleeding with total blood loss <1500 mL.
- Stage 3: Total blood loss >1500 mL or >2 units packed red cells transfused; or unstable vital signs; or suspicion of disseminated intravascular coagulation.
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