Electronic fetal monitoring and fetal scalp blood sampling (FBS) were developed in an attempt to reduce cerebral palsy caused by intrapartum asphyxia. Cardiotocography (CTG) tracings indicate the absence of intrapartum asphyxia, but interpretation of tracings varies considerably, with false-positives leading to operative vaginal delivery and emergency cesarean delivery (CD). This review summarizes the development and evaluates the effect and usefulness of FBS as a supplement to CTG.
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