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How Priya Uses Continuous Core Temperature to Predict Your Most Fertile Days

How Priya Uses Continuous Core Temperature to Predict Your Most Fertile Days

For over 100 years, we have known that we ovulate once a month. And since that time, we have tried to capture this crucial moment to conceive by peeing on sticks, observing cervical mucus (CM), tracking basal body temperature (BBT), and looking at the shape of our saliva under a microscope (1). Yet, with all the advances in ovulation predictor products, many women still feel that the options are cumbersome and unreliable. Plus, all the methods currently available only “estimate” when we are most fertile (1).

Science shows that there is a biomarker, a type of biological guidepost, that can tell us precisely when we are most fertile (2, 3, 4, 5) — which is not the day we ovulate, but 2 days before (10). Technology is advancing in every category of our lives, so what about our fertility? Can technology today notify us when we are most fertile? The answer is yes, and the product is called Priya.

Why measure continuous core temperature?

The short answer: External cues can affect oral and skin temperature measurements (6). Not feeling great? Not sleeping well? These types of everyday factors can impact peripheral temperature readings (7). Continuous core temperature, on the other hand, is not affected by any external factors and is capable of detecting subtle pattern changes in temperature that predict ovulation (5). Priya measures continuous core temperature and, therefore, is not affected by movement, alcoholic beverages, medications, and other external factors to which other ovulation products are susceptible — making it possible to precisely identify your most fertile days (5).


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The Science Behind Priya

Our bodies tightly control core body temperature and exhibit a striking cyclical temperature pattern. A pre-ovulatory decline in core temperature (aka dip in temperature before ovulation) may be observed about 24 to 48 hours prior to ovulation (5, 8). What this means is that if we can accurately capture truly continuous core temperature — measuring  core temperatures over and over all day and night — we can predict the fertile window and impending ovulation. In fact, algorithms that map core temperature trends over time have achieved a 99% sensitivity for detection of ovulation, with a 99% accuracy (9).

Because core body temperature is measured continuously and collects a multitude of data points, Priya is able to predict your most fertile days during the first cycle of use. 

How Priya Uses Continuous Core Temperature to Find the Fertile Window

So, how does Priya capture the elusive dip in temperature to predict the fertile window and ovulation using continuous core temperature? Priya is a vaginal ring that you insert at home. There are no monitors, attachable external sensors, urine strips, or replacement parts. All that is required is to pair the Priya Sensor with the Priya App on your smartphone and insert the sensor. Once inserted, Priya captures your core temperature 24–7 and notifies you on your smartphone when you are most fertile, freeing you to go about your life as normal.

By wirelessly capturing continuous core temperature, Priya provides a level of precision unmatched by other methods for predicting the fertile window and ovulation.


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Take Control of Your Fertility

Priya by Prima-Temp gives you control over your fertility by eliminating the guesswork. We want to give you the greatest chance of getting pregnant when you want to. Interested in learning more about Priya? Sign up here for product updates to learn more and be notified when the Priya Personal Fertility System is available for purchase.



  1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5689497/
  2. https://www.rbmojournal.com/article/S1472-6483(10)62544-8/pdf
  3. https://www.ncbi.nlm.nih.gov/pubmed/11003999
  4. https://www.ncbi.nlm.nih.gov/pubmed/9314907
  5. https://www.physiology.org/doi/full/10.1152/ajpregu.2000.279.4.R1316?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%3dpubmed
  6. https://www.ejog.org/article/0028-2243(92)90041-V/pdf
  7. https://annals.org/aim/article-abstract/2470325/accuracy-peripheral-thermometers-estimating-temperature-systematic-review-meta-analysis
  8. https://www.ncbi.nlm.nih.gov/books/NBK279054/#female_the-normal-menstrual-cycle-and-the-control-of-ovulation._2
  9. https://journals.lww.com/greenjournal/Abstract/2016/05001/Continuous,_Passive_Personal_Wearable_Sensor_to.219.aspx
  10. https://academic.oup.com/humrep/article/14/7/1835/2913179