Effectiveness of Saliva Crystal Observation and Basal Body Temperature for Contraception

Saliva contraception

I have seen products available for purchase that claim to determine ovulation periods by observing saliva crystals.
What is the effectiveness of this method for contraception? Additionally, how effective is using basal body temperature measurement for contraception? Thank you.

ray, 20~29 year old female. Ask Date: 2002/11/29

Dr. Peng Yiguo reply Obstetrics and Gynecology

With advancements in technology, there are now compact electronic thermometers and predictive devices designed to monitor hormonal changes before and after ovulation, including the crystallization of saliva that occurs near the ovulation period.
These tools are convenient and allow for self-monitoring at home; however, the failure rate remains at 15-20%.
In the future, more precise devices may be developed, or they could be used in conjunction with other ovulation prediction methods, such as basal body temperature, to achieve better contraceptive effectiveness.
The basal body temperature method requires careful and patient recording, and intercourse should be limited to three days after the temperature rise.
If used diligently and consistently, the failure rate over one year can be around 1-2%.

Reply Date: 2002/11/29

More Info

The effectiveness of using saliva crystal observation and basal body temperature (BBT) tracking for contraception is a topic of interest for many individuals seeking natural family planning methods. Both methods are based on physiological changes that occur during the menstrual cycle, particularly around ovulation.

Saliva Crystal Observation:
Saliva crystal observation involves examining the patterns of crystallization in saliva, which can indicate hormonal changes associated with ovulation. When estrogen levels rise prior to ovulation, the saliva can form a fern-like pattern when dried. This phenomenon is due to the increased salt concentration in saliva, which changes as hormone levels fluctuate.
While some studies suggest that this method can help predict ovulation, its effectiveness as a contraceptive method is not well-established. The accuracy of saliva crystal observation can be influenced by various factors, including hydration levels, diet, and individual hormonal fluctuations. Therefore, while it may provide some indication of fertile days, relying solely on this method for contraception may not be sufficient for those seeking a high level of reliability.

Basal Body Temperature (BBT) Tracking:
BBT tracking involves measuring the body temperature first thing in the morning before any activity. After ovulation, there is a slight increase in BBT due to the hormone progesterone. By charting daily temperatures, individuals can identify a pattern that indicates when ovulation has occurred.
BBT tracking can be more reliable than saliva observation when used consistently and correctly. However, it requires diligence and may not be effective for everyone. Factors such as illness, sleep disturbances, and even alcohol consumption can affect BBT readings, leading to potential misinterpretation of fertile and infertile days.

Combined Approach:
Many practitioners recommend a combined approach, using both saliva crystal observation and BBT tracking along with other signs of fertility, such as changes in cervical mucus. This multifaceted method can provide a more comprehensive understanding of the menstrual cycle and improve the chances of accurately identifying fertile windows.

Effectiveness:
When used correctly, natural family planning methods, including BBT tracking and saliva observation, can be effective for contraception. However, they require a thorough understanding of one's body and consistent monitoring. The typical failure rate for natural family planning methods can be higher than that of hormonal contraceptives or barrier methods, often cited around 24% in typical use.
For those considering these methods, it is advisable to consult with a healthcare provider or a fertility awareness educator. They can provide guidance on how to effectively use these methods and discuss other contraceptive options that may be more reliable depending on individual circumstances.

In conclusion, while saliva crystal observation and BBT tracking can be valuable tools for understanding fertility and planning for pregnancy or contraception, they are not foolproof methods. A comprehensive approach, possibly incorporating additional fertility awareness methods, is recommended for those seeking effective contraception.

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