Which explanation of a marginal placenta previa would the nurse provide to her client?
a. The placenta is in the lower uterus, completely covering the internal cervical os.
b. The placenta is in the lower uterus, more than 3 cm from the internal cervical os.
c. The placenta is in the lower uterus, less than 3 cm from the internal cervical os.
d. The placenta is in the lower uterus, at the edge and partially covering the cervical os.
ANS: B
A marginal placenta, also called a low-lying placenta, is more than 3 cm from the internal cervical os. The placenta in the lower uterus, completely covering the internal cervical os, describes a total placenta previa. The placenta in the lower uterus, less than 3 cm from the internal cervical os, and the placenta in the lower uterus, at the edge and partially covering the cervical os, are both descriptions of a partial placenta previa.
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