Plains All American Pipeline, L.P. (Plains) is engaged in the transportation, storage, terminalling and marketing of crude oil and refined products, as well as in the processing, transportation, fractionation, storage and marketing of natural gas liquids (NGL).
The first stage of labor is the longest and involves three phases: 1  Early Labor Phase âThe time of the onset of labor until the cervix is dilated to 3 cm. 2  Active Labor Phase â Continues from 3 cm. until the cervix is dilated to 7 cm.  Transition Phase â Continues from 7 cm. until the cervix is fully dilated to 10 cm.
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 babyâs 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 babyâs head is at +4 station it is essentially delivered.