Reappraisal of the definition of Postpartum haemorrhage

Postpartum haemorrhage (PPH), commonly defined as a blood loss of 500 ml or more within 24 hours after birth, is the leading cause of maternal mortality worldwide. Although the 500mL threshold is the most internationally accepted definition, the evidence base is not clear. Substantial disagreements exist among policymakers on the definition of PPH. Additionally, current definitions do not take into account recent population-based changes in risk factors of PPH such as caesarean section, as well as changes in contemporary clinical practice.

In recognition of the growing need for global action to improve PPH prevention and care, HRP has worked together with key stakeholders to develop a Roadmap to combat postpartum haemorrhage. The PPH Roadmap outlines goals, activities and milestones for global level research, normative work, implementation and advocacy, between 2023 and 2030. As part of WHO’s efforts to respond to the PPH Roadmap on developing up-to-date and universally acceptable norms and standards, WHO has embarked on a rigorous reappraisal process for PPH definitions as a fundamental requirement towards improving PPH care and outcomes globally. 

The WHO aims to achieve the above goal by embarking on a multi-step process that includes syntheses and review of the up-to-date research evidence base underpinning the definitions of PPH and reaching scientific consensus through external technical consultations.