postpartum hemorrhage http://purl.bioontology.org/ontology/MESH/D006473 http://purl.obolibrary.org/obo/NCIT_C92853 https://en.wikipedia.org/wiki/Postpartum_bleeding https://www.wikidata.org/wiki/Q2916482 Excess blood loss from uterine bleeding associated with obstetric labor or childbirth. It is defined as blood loss greater than 500 ml or of the amount that adversely affects the maternal physiology, such as blood pressure and hematocrit. Postpartum hemorrhage is divided into two categories, immediate (within first 24 hours after birth) or delayed (after 24 hours postpartum). PPH postpartum hemorrhage obstetrical hemorrhage