North American Registry of Midwives (NARM) Practice Exam

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Prior to labor, what is the expected effacement percentage of a primigravida's cervix?

0 to 10%
10 to 30%
50 to 60%
70 to 80%

The correct answer is: 50 to 60%

In a primigravida, which refers to a woman who is pregnant for the first time, the cervix typically undergoes certain changes in preparation for labor. Effacement is the process by which the cervix thins and shortens in readiness for childbirth. Prior to actual labor, it is generally expected that the cervix of a primigravida will be about 50 to 60% effaced. This level of effacement indicates that the cervix is beginning to thin out, but it is not yet fully prepared for the active phases of labor. Understanding this change is crucial for midwives and healthcare providers in assessing the progress of a woman's pregnancy and readiness for labor. The effacement process is a key aspect of cervical changes that occurs as the body prepares for the delivery of the baby, and this percentage reflects the common physiological response during early labor for a first-time mother.