North American Registry of Midwives (NARM) Practice Exam

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What is the primary action of Norplant in preventing pregnancy?

Inhibiting ovulation
Thickening the cervical mucus
Altering the uterine lining
Reducing sperm motility

The correct answer is: Thickening the cervical mucus

Norplant is a form of long-acting reversible contraception that primarily prevents pregnancy by thickening the cervical mucus. This thicker mucus creates a barrier that is less permeable to sperm, making it more difficult for sperm to reach and fertilize an egg. While Norplant may also have secondary effects such as inhibiting ovulation and altering the uterine lining, its primary and most immediate action in the prevention of pregnancy is through the thickened cervical mucus. The other actions, such as inhibiting ovulation or altering the uterine lining, may also play a role in preventing pregnancy, but they are not the primary mechanism. Therefore, thickening the cervical mucus is the most significant way Norplant operates to provide contraceptive efficacy.