how to measure dilation
Dilatation is a measurement of how open the cervix is and is measured in centimeters. It ranges from 0 (closed) to 10 (completely dilated). Effacement is how thin the cervix is and it is measured in percent. 0% effaced is a cervix prior to any change. 100% effaced is a completely thinned out cervix. Station is a measure of how low the babyâs head is in the pelvis. It is measured from -3 to +4. A baby at -3 station is still very high in the pelvis and not close to delivery. If the babyâs head is at +4 station it is essentially delivered.