NDSU Student Health Service
Choices Program

Your Reproductive Health - Diaphragm

 

Diaphragm & Cervical Cap

A diaphragm is a dome-shaped rubber cup that is placed inside the vagina covering the cervix. Before placement, the diaphragm is filled with spermicide and then placed directly over the cervix to prevent sperm from entering the uterus. Spermicidal jelly or cream MUST be used with the diaphragm.

Once inserted, the diaphragm protects against pregnancy for 6 to 8 hours. If sex is repeated, or if more than 8 hours have elapsed since insertion, it is recommended that fresh spermicide cream or jelly be inserted (without removing the diaphragm). The diaphragm must remain in place for a minimum of 6 hours after intercourse.

The cervical cap is a deep rubber cup with a firm rim. It fits snuggly on the cervix and prevents sperm from entering the uterus. Spermicide is also used inside the cervical cap. The cervical cap provides protection for up to 48 hours, no matter how many times intercourse occurs. Additional spermicide is not necessary if sex is repeated. The cap must remain in place for a minimum of 6 hours after intercourse. Both the diaphragm and the cap must be fitted by a health care professional.

Warning: wearing the diaphragm or cap for longer than recommended may increase the risk of toxic shock syndrome (TSS).

How reliable are the diaphragm and cervical cap in preventing pregnancy?

• When used correctly with spermicide, the diaphragm is 94% effective.
• When used correctly with spermicide, if you have never had children, the cervical cap is 91% effective.
• When used correctly with spermicide, if you have had children previously, the cervical cap is 84% effective.