Obstet Gynecol. 2012 Oct;120(4):983-8. doi: 10.1097/AOG.0b013e3182723b7d.
Long-acting reversible contraception (LARC)—intrauterine devices and the contraceptive implant—are safe and appropriate contraceptive methods for most women and adolescents. The LARC methods are top-tier contraceptives based on effectiveness, with pregnancy rates of less than 1% per year for perfect use and typical use. These contraceptives have the highest rates of satisfaction and continuation of all reversible contraceptives. Adolescents are at high risk of unintended pregnancy and may benefit from increased access to LARC methods.
长效可逆避孕方法（LARC）——宫内节育器和避孕植入物——对大多数女性和青少年来说是安全且合适的避孕方法。LARC 方法是基于有效性的顶级避孕方法，其完美使用和典型使用的妊娠率均低于 1%。这些避孕方法在所有可逆避孕方法中具有最高的满意度和续用率。青少年面临着意外怀孕的高风险，可能会受益于增加获得 LARC 方法的机会。
