Lower-dose IUDs were associated with an increased risk for ectopic pregnancy compared with higher-dose systems, according to a retrospective cohort study published in Obstetrics & Gynecology.
Overall, however, the levonorgestrel-releasing intrauterine systems (LNG-IUS) of 13.5 mg, 19.5 mg and 52 mg doses recorded low absolute risks for ectopic pregnancy, demonstrating their protective effects, according to the study.
“Study populations of previous studies of LNG-IUS 13.5 mg and 19.5 mg have excluded women with known risk factors for ectopic pregnancy,” Karin Elgemark, MD, a PhD