How effective are cervical caps?
The effectiveness of a cervical cap depends on the brand and fit. Cervical caps come in different sizes to fit different women, and the initial fitting is done in a doctor’s office. When you are first fitted for the cap, your doctor will show you how to insert the cap. Older cervical caps have an annual standardized failure rate of 16% for women who have never given birth, and as high as a 36% failure rate for women who have given birth. Giving birth or having an abortion can affect the way a cervical cap fits, making it less effective. This rate may be less of a problem for newer versions of the cap. After a birth or an abortion, a doctor must recheck the fit of the cervical cap.
