With regard 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.
B
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A 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.
B The station of the presenting part should be noted at the beginning of labor so that the rate of descent can be determined.
C The largest diameter usually is the biparietal diameter. The suboccipitobregmatic diameter is the smallest, although one of the most critical.
D Engagement often occurs in the weeks just before labor in nulliparas and before or during labor in multiparas.
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