Table 1.

Previously Suggested Risk Factors Associated with Fetomaternal Hemorrhage

Maternal Characteristics	Fetal Characteristics	Placental/Uterine Characteristics	Interventions/Events
*Race/Ethnicity[5, 14]	Fetal anomalies[23]	Abruption[5, 24, 25]	*Amniocentesis/Invasive obstetric procedures[13, 23, 26]
Socioeconomic Status[5]	*Twin Gestation[14]	Umbilical vein anomalies[5, 22]	*External cephalic version[27]
Geographic region of delivery[5]		Chorioamnionitis[8]	Maternal abdominal trauma[28]
Pre-eclampsia		*Twin gestation[14]
		Placental tumors[29]

^*Shown to be both associated with FMH and not associated with FMH in different studies