[Comment] The use of IPD meta-analysis in maternal health prognostics

For decades, evidence guiding the diagnosis of postpartum haemorrhage has been constrained by traditional aggregate data reviews that mask patient-level variation and rely on arbitrary thresholds. The WHO-led individual participant data (IPD) meta-analysis by Ioannis Gallos and colleagues represents a methodological breakthrough, assembling original, anonymised records from more than 312 000 women and reanalysing prognostic markers for adverse postpartum haemorrhage outcomes at the participant level, rather than through study-level summaries.