As relates to fetal positioning during labor, nurses should be aware that:
a. Position is a measure of the degree of descent of the presenting part of the fetus through the birth canal.
b. Birth is imminent when the presenting part is at +4 to +5 cm below the spine.
c. The largest transverse diameter of the presenting part is the suboccipitobregmatic diameter.
d. Engagement is the term used to describe the beginning of labor.
ANS: B
The station of the presenting part should be noted at the beginning of labor so that the rate of descent can be determined. Position is the relation of the presenting part of the fetus to the four quadrants of the mother's pelvis; station is the measure of degree of descent. The largest diameter usually is the biparietal diameter. The suboccipitobregmatic diameter is the smallest, although one of the most critical. Engagement often occurs in the weeks just before labor in nulliparas and before or during labor in multiparas.
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