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1. Definition and Recognition

• Definition: The standard definition of PPH is a cumulative blood loss of ≥ 1000 mL, or any blood loss accompanied by signs and symptoms of hypovolemia within 24 hours following delivery, regardless of whether the delivery was vaginal or cesarean.
• Classification: PPH is considered "primary" (or immediate) if it happens within the first 24 hours, and "secondary" (or delayed) if it happens between 24 hours and 12 weeks after delivery. Primary PPH is vastly more common and clinically severe.
• Clinical Presentation: PPH often occurs suddenly, without warning, and in the absence of  ...