Oya et al identified risk factors associated with maternal blood transfusion in the peripartum period associated with placenta previa. These can help to identify a woman who may benefit from extra precautions during delivery, including the availability of blood for transfusion (i.e., no home delivery).
Patient selection: pregnant woman with placenta previa (partial or complete)
(1) maternal age
(2) history of dilatation and curettage (D & C)
(3)type of placenta previa (complete previa = complete coverage of the internal os by the placenta)
age of the mother
<= 34 years
> 34 years ("advanced")
number of D & Cs in the past
0 or 1
2 or more
none or partial previa
number of risk factors =
= SUM(points for all 3 parameters)
• minimum score: 0
• maximum score: 3
• The risk of bleeding that requires blood transfusion increases with the number of risk factors.
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Specialty: Clinical Laboratory, General Surgery, Anesthesiology, Emergency Medicine, Critical Care