North American Registry of Midwives (NARM) Practice Exam

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By when does the external os assume its nonpregnant form?

  1. By the second week

  2. By the third week

  3. By the fourth week

  4. By the fifth week

The correct answer is: By the fourth week

The external os of the cervix undergoes significant changes during pregnancy, becoming softer, more moist, and more closed compared to its nonpregnant state. By the fourth week of gestation, hormonal changes influenced by pregnancy, particularly the effects of estrogen and progesterone, trigger these modifications. At this point, the external os significantly shifts back towards its nonpregnant form, which is characterized by a more rounded and less open appearance. This transition is part of the body’s preparation for the developing fetus and ensures that the cervix remains in a protective state as pregnancy progresses. Thus, the correct timing for the external os to assume its nonpregnant form is by the fourth week.

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