How effective is a diaphragm? Effectiveness and use explained simply

In a nutshell

The diaphragm is a hormone-free barrier method of contraception. It is inserted into the vagina before sexual intercourse and covers the cervix, preventing sperm from entering the womb.

The Caya® diaphragm is a modern, one-size-fits-most diaphragm that was developed in collaboration with users and can be used without individual fitting.

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Why many people ask: How reliable is a diaphragm?

Anyone interested in hormone-free contraception often want to know how reliably a diaphragm can prevent pregnancy.
The effectiveness of contraceptive methods is usually described in studies using so-called pregnancy rates or the Pearl Index. It is important to understand that:
With many methods, effectiveness depends not only on the method itself, but also on how consistently and correctly it is used.

This applies in particular to user-dependent methods such as:

• Diaphragm
• Condoms
• Natural family planning (NFP)
• The 'pill' 

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How is the effectiveness of contraceptive methods assessed?

In scientific studies on contraceptives, a distinction is often made between:
typical use 
perfect use

This distinction helps to assess effectiveness as realistically as possible.

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Typical use

'Typical use' describes use under everyday conditions.
This may include, for example, situations in which:

• the diaphragm is not positioned correctly 
• the gel is forgotten
• the method is not used every time you have sex
• or errors in use occur

The 'typical use' figures therefore reflect how a method works in real-life situations.
For user-dependent contraceptive methods, the actual effectiveness can therefore be influenced by how consistently and correctly the method is used.

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Perfect use

'Perfect use' describes the best possible use in everyday life.
With the diaphragm, for example, this means:

• the diaphragm is inserted correctly before every act of sexual intercourse
• the cervix is completely covered
• a suitable diaphragm gel is used
• the diaphragm remains in the vagina for at least six hours after sexual intercourse

However, it is important to note that:
'Perfect use' does not mean complete protection or error-free use under laboratory conditions. Even when used correctly, no barrier method can completely rule out pregnancy. No contraceptive is 100% effective.

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How effective is a diaphragm?

The effectiveness of the Caya® diaphragm was investigated in a clinical trial involving 450 couples over a period of approximately six months, or six menstrual cycles. 

The results showed that:
With typical use, around 10 out of 100 women became pregnant. In other words, around 90 out of 100 women did not become pregnant.
With perfect use, around 8 out of 100 women became pregnant. In other words, around 92 out of 100 women did not become pregnant.

The study also showed that:

• 98% of women were able to use the 'Caya' one-size-fits-most diaphragm,
• the majority of participants rated the method positively,
• and its use was predominantly described as easy.

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Why people choose a diaphragm

The choice of a contraceptive method does not depend solely on statistical effectiveness. Many people consciously choose a diaphragm because it:

• is hormone-free
• is used only when needed
• has no systemic effect on the body
• is user-controlled
• is reusable
• and is compatible with the natural menstrual cycle

For many users, therefore, the focus is not solely on maximum effectiveness, but on the combination of hormone-free contraception, flexibility and personal comfort.

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Frequently asked questions about the safety of a diaphragm

Does a diaphragm always have to be used with gel?
Yes. The diaphragm should always be used together with a suitable diaphragm gel. The gel further enhances the barrier effect and makes it more difficult for sperm to pass through the barrier.

Does a diaphragm also protect against sexually transmitted infections?
No. A diaphragm does not provide reliable protection against sexually transmitted infections (STIs). Condoms are recommended for protection against STIs.

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Conclusion

The diaphragm is a hormone-free barrier method that can be used flexibly and when needed.
Clinical trial data on the Caya® diaphragm show that its effectiveness depends on correct and consistent use.
For people seeking a hormone-free, on-demand and user-controlled method of contraception, the diaphragm may be a suitable option.

Scientific sources

1. Schwartz JL et al.
   Contraceptive Efficacy, Safety, Fit, and Acceptability of a Single-Size Diaphragm       Developed With End-User Input.
   Obstetrics & Gynecology. 2015;125(4):895–903.
   DOI: 10.1097/AOG.0000000000000721
   You can find the full study here
2. Trussel J.
   Contraceptive failure in the United States.
   Contraception. 2011;83(5):397–404.
   DOI: 10.1016/j.contraception.2011.01.021
3. Centers for Disease Control and Prevention (CDC).
   Contraception and Birth Control Methods.
   https://www.cdc.gov/contraception/

⚠️Disclaimer: This article is for general information purposes only and is not a substitute for individual medical advice.

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