How is the correct cervical cap size determined?
A bimanual, pelvic examination must be performed to ascertain the position and size of the uterus and cervix. Speculum examination allows visualization of the cervix, which is helpful in estimating the internal cap diameter. Two or more cervical cap sizes should be tried to achieve the optimal fit. A cervical cap that fits too tightly can cause trauma to the cervix, and one that fits too loosely will be more likely to become dislodged or to not form a secure seal. When fitted properly, a vacuum is created and the cervical cap cannot turn. It is estimated that six to thirty percent of women may experience difficulty achieving a good fit with the limited size selection of available cervical caps.
