Abstract
Questions persist about the mechanisms by which the levonorgestrel-releasing intrauterine system (LNG-IUS) prevents conception. Progestin-only contraceptives hamper sperm penetration by altering cervical mucus, but prevention of sperm penetration in LNG-IUS users has not been documented. In a nonrandomized investigator-blinded study, qualities and in vitro sperm-penetrability of cervical mucus from 14 LNG-IUS …
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