How YONO Detects the Fertility Window


Basal Body Temperature (BBT) is the lowest body temperature attained in a 24-hour period; usually between 2 am and 6 am. In the past, it was generally measured immediately after awakening – before eating, drinking, having sex, sitting up in bed or even putting a foot on the floor. If you didn't take your temperature immediately after waking up, your BBT chart would not be accurate.

How does measuring BBT help detect ovulation? It is also an indicator that has a strong correlation with the hormonal level in the body. Depending on the individual, a woman’s normal, non-ovulating temperature is between 96 and 99 degrees Fahrenheit (by an oral thermometer). Following the luteinizing hormone surge, the egg is released, stimulates ovulation and is associated with a 0.5 to 1 degree Fahrenheit rise in BBT. Then, the hormone progesterone, secreted by the ovary after ovulation, heats things up; it also prepares the uterine lining for a possible pregnancy. Body temperature will remain roughly half a degree higher until right before menstruation, when it returns to normal (if you get pregnant, your temperature will stay higher through the first trimester). 

Charting BBT can help identify a fertility-threatening condition called luteal phase defect, in which insufficient levels of the hormone progesterone cause a temperature rise at ovulation, and then a drop, at least several days before menstruation. If your temperature remains constant over the course of your cycle, you might not be ovulating at all. BBT data can also assist in diagnosing potential hormonal problems. For example, if the temperature reading in the second phase of the cycle (luteal phase) does not remain steady, your progesterone secretion may not be enough to maintain implantation and pregnancy. By tracking the BBT, which sounds much easier, women can also understand their menstrual cycle, ovulation date and hormonal health. 

How YONO Helps

The traditional method used to chart BBT is to prepare a bedside thermometer and set an alarm for you to awake at the same time every day (it is also recommended that you take the BBT after at least 3 hours of sleep). Then, you have to remember to measure the temperature immediately after awakening, without any physical activity, since body temperatures rise very rapidly once in motion. Finally, you must record the data in a notebook, or a Smartphone, charting application. Even the most disciplined woman may feel stressed and have difficulty completing this daily routine of charting BBT data.

Now, women have the option of letting technology do the work and much more easily and with much higher accuracy. YONO earbud provides a concealed and stable environment in the ear canal. After about 20-30 minutes, the temperature in the ear canal is close to core body temperature, and YONO earbud can detect and record the temperature in the ear canal every 5 minutes. Most of the other sensors on the market measure skin temperature; e.g. underarm or wristband. Skin temperature can easily be affected by ambient temperature. After only one night, YONO collects about 100 data points, once the user connects their Smartphones. Data automatically syncs into an application and YONO automatically calculates and saves your BBT data (You could also check the article - How We Process Your Data.) With the latest wearable technology, many steps of this process would be eliminated, letting women monitor their body much more easily, allowing them to enjoy a better quality of life during the process of trying to conceive.