Diaphragm or cap

A contraceptive diaphragm or cap is a circular dome made of thin, soft silicone that's inserted into the vagina before sex.

It covers the cervix so sperm can't get into the womb (uterus) to fertilise an egg.

When used correctly with spermicide, a diaphragm or cap is 92-96% effective at preventing pregnancy. This means that between four and eight women out of every 100 who use a diaphragm/cap as contraception will become pregnant within a year.

If you have no symptoms and want a straightforward test you can:

  • either order a smart kit online for home delivery
  • or attend one of our clinics where you can collect a smart kit without needing to wait and see a clinician.

This is a quick, easy and confidential way to screen for chlamydia, gonorrhoea, HIV and syphilis.

Call our appointments line for more information about sexual health services in Merton, Richmond and Wandsworth.

0333 300 2100 (Mon-Fri 8am-8pm).

Read more about the diaphragm/cap via the NHS Choices website