OvuCore is the new name for the OvuSense sensor. Click here to read the announcement.
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Core Temperature Technology

When you’re trying to get pregnant, one simple thing you can do to help is to measure your core temperature, specifically what’s known in fertility circles as your BBT, your Basal Body Temperature. This is the low, minimum temperature your body cools to during a period of rest or deep sleep, when your heart rate is slower. If you measure this minimum temperature every day throughout your menstrual cycle, you’ll notice that it doesn’t remain constant: your minimum temperature varies, from day to day. If you measure it for multiple cycles, you’ll see how a specific pattern of changes coincides with when you ovulate, and so you can use it to give yourself warning and ensure you’re trying to conceive within your ‘fertile window’: those few days in each cycle when active sperm have a chance to encounter and fertilise an egg.

Whilst this method can prove successful for some people, it can be time consuming keeping track of results every day for an extended period of time. There are also some limitations surrounding the accuracy of this method of measurement, particularly for those with irregular cycles or fertility issues. OvuSense has some advice to offer regarding BBT monitoring and whether it should be a key part of your fertility plan.


One thing you need to bear in mind is where you’ll be taking your readings from. Most BBT monitors use an oral thermometer (from the mouth) which whilst being easy to use, is limited in its accuracy as they tend to only produce readings to the nearest tenth of a degree and can often miss subtle changes in temperature which result in inaccurate predictions. OvuSense's method addresses this problem by using a vaginal sensor, which whilst being slightly less comfortable to use, gives a true reading of your fluctuations in progesterone throughout your cycle and, therefore, a more accurate result.

Processing Data

Turning all these temperature readings into a result takes a lot of work – you need to record them, perhaps turn them into a graph, and look for the right pattern every month that tells you when you’re due to menstruate.

Whilst there are now lots of apps available that can bear the weight of this work, the results are only as good as the method they use. BBT monitoring also relies on previous month's data to form predictions for current and future month's, a method which as noted above is not suitable for those with irregular cycles or fertility issues.


OvuSense combines the best of both worlds: our sensor automatically transfers the data to be processed by our clinically tested algorithm, to give you a notification 24 hours before you ovulate which is correct 96% of the time as well as a prediction of your next fertile window!

Find out more about core temperature technology and fertility here