Risk factors for obstetrical hemorrhage among nulliparous, term, singleton, vertex pregnancies

Postpartum hemorrhage (PPH) is an important cause of severe maternal morbidity. Current prediction models do not identify risk factors for PPH among low-risk pregnant patients. Our objective was to evaluate the labor course and identify factors associated with PPH among nulliparous, term, singleton, vertex patients (NTSV) to develop a nomogram to assess risk.