What requirement must be met before applying a fetal scalp electrode (FSE)?

A fetal scalp electrode (FSE) can only be applied once certain criteria are met, and one of the primary requirements is cervical dilation. This is essential because the electrode is placed directly on the fetal scalp through the cervix, which is only possible if the cervix is sufficiently dilated. The application of the FSE involves an invasive procedure that requires access to the fetal environment, which cannot occur if the cervix is not open to at least a degree that facilitates such access.

While other factors like uterine contractions, maternal fever, or fetal positioning may be relevant to the overall monitoring of the fetus, they do not directly influence the ability to safely and effectively place an FSE. The concern primarily lies with ensuring that the procedure can be conducted without compromising either maternal or fetal safety, which is reliant on adequate cervical dilation.