station
The position of the fetal presenting part relative to the maternal ischial spines, measured in centimeters above (-) or below (+) the spines.
Full Definition
Station describes the descent of the fetal presenting part (usually the head) through the birth canal, using the maternal ischial spines as the reference point. The ischial spines represent the narrowest part of the pelvis and are designated as station 0. Stations above the spines are negative (-5 to -1), while stations below are positive (+1 to +5). A station of +5 indicates the presenting part is at the perineum and delivery is imminent. Station assessment is crucial for monitoring labor progress and determining the need for operative delivery. Documentation of station changes helps clinicians assess whether the fetus is descending appropriately during the second stage of labor.
Usage
Usage note: Use negative numbers for stations above ischial spines, positive for below; always include the + or - sign.
In Context
- "Fetal head at -2 station with good flexion noted on examination." — Labor assessment note
- "Station progressed from 0 to +3 over the past two hours of pushing." — Delivery documentation