Incidence, trends and risk factors for obstetric massive blood transfusion in China from 2012 to 2019: an observational study.

To minimise the incidence of obstetric MBT, more attention should be paid to education on the importance of the antenatal visit, evidence-based transfusion practice and females who are multiparous and have an advanced age, amniotic fluid embolism, uterine atony, severe anaemia and placenta previa.