More data to come from further analysis
During a question-and-answer session following the presentation, Dr. Long was asked whether suction might contribute to expulsion. “We advised subjects to break the seal on the menstrual cup prior to removal, but we did not see a decrease in expulsion rates with menstrual cup use after this advisory,” she said.
“The type of menstrual cup may be a factor,” she added. “We still need to analyze the data by the type of menstrual cup used as different cups have different degrees of suction.”
When asked about the potential role of coital activity on expulsion, Dr. Long said that the researchers had not yet reviewed coital activity logs to compare expulsion data with the timing of sexual activity.
Any increased pregnancy rates among menstrual cup users are “unlikely, but we don’t know for sure,” she added.
The current study also did not evaluate quantitative differences in bleeding, and participants are using bleeding diaries, Dr. Long noted. She added that participants are able to report problems with bleeding to the study sites, and that these are captured as adverse events.
The study was supported by a partnership between NICHD and FHI 360, a nonprofit human development organization based in North Carolina, with FHI 360 funding from the Bill and Melinda Gates Foundation. Dr. Long had no financial conflicts to disclose.