OvuSense 3G Sensor and App FAQs

Technical questions about OvuSense Sensor and App

  • OvuSense is available for iOS and Android devices. OvuSense App is compatible with Android devices that have built in NFC (near field communication). For iOS devices, OvuSense is compatible with the below devices running iOS version 8 or later:

    iPhone: 4S, 5, 5C, 5S, 6, 6 Plus, 6S, 6S Plus

    iPad: All models

    iPod: Touch 1st generation, Touch 2nd generation

  • OvuSense uses an ovulation detection method, independently established in the clinical literature, known as the '3 over 6' rule*. This means OvuSense is looking for a sustained rise in temperature of over 0.1 degrees Celsius for each of 3 consecutive days in any window of 6 days. This sustained rise produces a specific pattern, and when OvuSense detects an ovulation date, it’s doing so on the basis of matching your current cycle pattern against the pattern of the established clinical rule. If you have not received a confirmed date of ovulation then there are insufficient data to provide evidence that ovulation has occurred by this rule. You may still see that a rise has occurred, and that could mean you have in fact ovulated but the rise was too “slow” to trigger the detection rule.

    * Barrett and Marshall (1969) later supported by McCarthy and Rockette (1983).

  • A realtime OvuSense prediction notifies you in advance during your cycle that ovulation may be about to happen, and a confirmation notifies you that ovulation has happened. OvuSense uses two separate methods for prediction and detection.

    Along with your prediction, OvuSense will show a green shaded area of your “ovulation window” on your graph, with the predicted day of ovulation shaded as a blue vertical line. The ovulation window is the four days immediately around ovulation, from one day before until two days after ovulation.

    The prediction method has a clinically proven sensitivity of 89% meaning that it picks up 89/100 ovulations in advance, but a positive predictive value of 96% which means that 96/100 predictions it makes are correct. Combining the data gives an overall accuracy figure of 89%*. The algorithm was deliberately designed not to give you the false hope of an ovulation if it might be wrong and that’s why it misses out some ovulations, but is good at getting them right when it does show one. The prediction message appears up to one day in advance of ovulation.

    OvuSense detection has a sensitivity of 99% meaning it picks up all by 1 in every 100 ovulations, and a positive predictive value of 100% meaning it’s gets them all right. Combining the data gives an overall accuracy figure of 99%*. The detection message is displayed 3 days after you have ovulated, by which time it has much more data to make the calculations and that’s the reason why it’s able to pick up more ovulations, more accurately.

    * Papaioannou S, Delkos D, Pardey J (2014).

  • The Fertile Window is shown from cycle 2 onwards if you received confirmed ovulation in the previous cycle. The Fertile Window is shown on your graph as an orange shaded area, with the predicted day of ovulation shaded with a blue vertical line. This window is the eight days when you are most likely to be able to conceive, from five days before ovulation until two days after ovulation. The window is based on the day of ovulation from the previous cycle, so if your cycles vary in length it will be less useful to you.

  • If you have a fever for two or more days you should stop using OvuSense until you are feeling better again. A short fever may show as a ‘spike’ in temperature on your chart. However, OvuSense has been designed with an intelligent filtering system that excludes ‘spikes’ when calculating ovulation so it should not affect your results.

  • As OvuSense takes temperature measurements in the vagina, it is not prone to external influences. It also takes a measurement every 5 minutes throughout the night and has been designed with an intelligent filtering systems that removes “spikes” in the data.

  • Women with any degree of irregularity in cycle length and/ or ovulation timing will struggle with standard basal body temperature (BBT) measurement, and products which measure other types of external temperature. That’s because there is too much variation in the temperature signal to produce an accurate representation of the action of progesterone on the ovaries – which is the signal we are trying to measure to see whether ovulation is about to occur or has occurred. The OvuSense reading is more accurate because it is taken from multiple overnight measurements in the vagina, and because the OvuSense algorithm is intelligently filtering the data to provide the truest representation of the action of progesterone on the ovaries. You should also be aware that a vaginal temperature is generally up to two degrees Celsius higher than an oral temperature reading, and higher still than other external temperature readings (such as those taken under the armpit or on the skin).

    As a result of measuring in the vagina and the filtering by the algorithm, your OvuSense temperature reading will therefore very rarely be the same as any other device you are using, and if you type the OvuSense temperatures into a fertility tracker app that will also produce a different (and most likely inaccurate) result because it is set up to give results based on a different method of temperature measurement.

    Papaioannou S, Delkos D, Pardey J (2014) shows OvuSense has a 99% accuracy for the detection of the date of ovulation, whereas trials for other temperature based systems show an accuracy of around 80% for detection of the date of ovulation: Freundl et. al. (2003), Rollason et al. (2014). Papaioannou S, Delkos D, Pardey J (2014) also shows OvuSense has an 89% accuracy for the prediction of ovulation in real time. No other temperature methods have a reported ability to predict the onset of ovulation in real time.

  • OvuSense was developed to provide the same benefit as OPK tests by predicting the onset of ovulation up to one day in advance in real time in each cycle. However, OPKs have been widely documented to produce false negative results ranging from 9% Lloyd R et al. (1989), to 20% Irons DW et al. (1994), to 35% Arici A et al. (1992). However, they can also produce false positive results = 7.7% according to McGovern PG et al. (2004), meaning couples attempt to conceive at the wrong point in the month. Elevated levels of Luteinising Hormone (which OPKs measure) - have been reported generally in patients with Polycystic Ovarian Syndrome - Robinson et al. (1992), and that is why many women with PCOS report difficulty in using OPKs.

    Unlike OPKs, OvuSense provides a clinically accurate detection of the exact date of ovulation day for all women regardless of whether they have ovulatory issues. OvuSense can also help you to diagnose ovulatory conditions by showing you an extremely accurate picture of your progesterone levels throughout the cycle.

  • Usually, your doctor will carry out one of two tests to determine if and when you ovulated.

    The most common test is serum progesterone, often called “21 day progesterone”. The value of serum testing has long been established, with a “serum concentration of greater than 3 ng/ml” providing “presumptive but reliable evidence of recent ovulation” ASRM (2012) referencing Wathen et al. (1984) – study size 79. In Europe the cut off is generally expressed in nmol/l where >30nmol/l is indicative of ovulation. However, blood tests are inconvenient for the clinic and patient, and will always suffer from issues of timing of the blood draw even in a patient with a regular cycle – with false negatives proving a common issue. The ASRM (American Society Reproductive Medicine) guidelines go on to state that “a serum progesterone measurement generally should be obtained approximately one week before the expected onset of the next menses, rather than on any one specific cycle day (e.g. cycle day 21).”

    This test cannot predict when you are about to ovulate in a cycle at all, and cannot provide a particularly reliable date of ovulation after the event either, as progesterone levels vary quite widely between women and from cycle to cycle, meaning that a positive result can occur over a 2-3 span. If the test is positive, there is a generally held view that ovulation occurs 7 days before the test is carried out which means day 14 in a woman with a 28 day cycle, but this is a much less reliable indicator than OvuSense as a serum progesterone result is only a spot test. It is also important to know that a negative serum progesterone result does not necessarily mean no ovulation occurred in that cycle.

    Here is a testimonial from an OvuSense user that shows how it can help in practical terms: “I just thought you may appreciate some positive feedback. After I used Ovusense, I rebooked my ‘21 day’ Progesterone blood test for the week later and the score has now come back as 50…. I am so pleased I invested in Ovusense because for 5 years I have presumed I have ovulated 10 days earlier than I actually do and have struggled to get pregnant. Thank you.” – Alison – October 2014.

    The alternative test is an ultrasound folliculometry scan. Three to four scans per cycle is the suggested requirement of good cycle monitoring. However, because a scan is a moment-in-time 'spot test', timing is everything. Your clinician will usually be looking for a dominant follicle (the next one that is most likely to rupture resulting in ovulation) in one ovary of 20mm or more in size, meaning that you are likely to ovulate in the next 24-48 hours. They may also look for evidence that a follicle has recently ruptured, meaning you have already ovulated during that cycle. However, folliculometry is not always a good predictor of ovulation, and is not surprising given that it holds that all women of whatever size and shape, or hormonal make-up will have identically sized follicles just before follicular rupture. Dominant follicle size can vary greatly as is shown by: Vlaisavljević and Došen (2007). It is therefore important to understand the result your clinician provides you in the context of your whole cycle. The best approach rather than estimating when ovulation will occur for you and scheduling based on this best guess, you can use the results from OvuSense to schedule ultrasound scans with your doctor which will provide you with much more detailed information about that cycle.

  • OvuSense uses an ovulation detection method, independently established in the clinical literature, known as the '3 over 6' rule*. This means OvuSense is looking for a sustained rise in temperature of over 0.1 degrees Celsius for each of 3 consecutive days in any window of 6 days. This sustained rise produces a specific pattern, and when OvuSense detects an ovulation date, it’s doing so on the basis of matching your current cycle pattern against the pattern of the established clinical rule. The algorithm that detects ovulation waits until 3 days after ovulation to confirm it as Fertility Focus internal studies showed this produced the most accurate result.

    * Barrett and Marshall (1969) later supported by McCarthy and Rockette (1983).

  • The OvuSense Sensor and App uses an improved technology to connect your Sensor with your mobile device. This allows you to access your data discretely and more conveniently allowing you to understand your ovulation cycles easily at any time. It also allows your data to be stored in encrypted format in the cloud meaning they are much more secure.

    The OvuSense and App has new features where you can add events to your ovulation cycle chart to identify days when you had your period, when you had sex and when you took a pregnancy test. It also has the key added feature of being able to share the data with your partner, friend or clinician.

  • No, your mobile device does not need to connect to internet for it to work and connect your Sensor. The OvuSense App will work offline for up to 30 days and you will receive a number of warnings up to that point that they need to connect to the internet:

    • After 14 days and for each day until day 22: ”
    • After 22 days and for each day until day 31: ”
    • After 31 days: ”

    Beyond day 30 all your previous data will be retained by the OvuSense App but you will no longer be able to connect your OvuSense Sensor until you have connected to the internet again.

  • Yes, you can use the OvuSense App for up to 30 days without internet access. See Q: Do I need to be connected to the internet to use my OvuSense App?

  • Sensor questions / inserting and cleaning

  • Hold the Sensor where the tail joins the main body. Aim toward the small of your back, and push it up. Once your Sensor is in place, you shouldn’t be able to feel it. If it's painful to sit down or walk around then the Sensor isn't far enough up the vagina. Insert your finger inside the vagina until you feel the Sensor. Push slightly, then do another walking test. The Sensor will never get stuck or lost inside you, there's nowhere for it to go.

  • Perhaps your Sensor isn’t in place. Insert your finger inside the vagina until you feel the Sensor. Push slightly and see if it holds in place. If you are still having problems please contact us at support@ovusense.com.

  • No, you should not use the Sensor when you are bleeding or spotting.

  • The Sensor is designed with materials that prevents growth of bacteria. Simply clean with warm water and soap. Do not use sterilizing solutions, alcohol wipes or sanitizing gels as they may damage the Sensor.

  • It is essential to remove the Sensor before sex. We recommend that the Sensor is reinserted after sex, to increase the amount of data collected. If you decide to continue using the Sensor after sex, remember to wash it before reinserting it. The Sensor is designed to discard temperature data which are not within the normal body range so any data collected when not in use will be removed.

  • You do not need to remove the Sensor when going to the bathroom. We recommend you hold the tail just in case it falls out. Or if you prefer simply remove the Sensor before your go to the bathroom and reinsert after. Remember to wash it before reinserting it. The Sensor is designed to discard temperature data which are not within the normal body range so any data collected when not in use will be removed.

  • Order and Delivery

  • You can purchase OvuSense directly from our website, www.ovusense.com.

    OvuSense is a real-time fertility monitor so can give you accurate information on when you ovulate. Therefore giving you on information on when to have sex to conceive.

  • Payment

  • To cancel your monthly payments you will need to log in to your PayPal account and do the following:

    1) click 'Profile' in the top right corner

    2) a drop-down menu appears; click 'Profile and Settings'

    3) click 'My Money' in the left-hand panel

    4) click 'Update' to the right of 'My pre-approved payments'

    5) click 'Fertility Focus Ltd'

    6) click 'Cancel'

    7) a pop-up window appears; click 'Cancel Profile' You can cancel your monthly payment at any time before the next payment is due.

    If you wish to use OvuSense at a later date you can re-subscribe at any time, please visit our website www.ovusense.com, and purchase a new subscription. Your data will be stored on our database for an indefinite period according to the terms and conditions agreed when you signed up.

  • If you decide to stop your OvuSense subscription then no data can be collected until you re-subscribe. If you wish to use OvuSense at a later date you can re-subscribe at any time, please visit our website www.ovusense.com, and purchase a new subscription. Your data will be stored on our database for an indefinite period according to the terms and conditions agreed when you signed up.

  • Yes, you can purchase a new Sensor from our website www.ovusense.com. Your new Sensor will need to be registered to you App account. Once, you have received your replacement Sensor, in you App select “Settings” and “Add Sensor”. Follow the on screen instructions.

  • The Sensor is for your personal use. Sharing it with others may present a hygiene risk. Each Sensor is uniquely registered to an App account, so your friend will need to set up her own account and purchase her own Sensor.

  • At OvuSense, we never promise ovulation or pregnancy. No one can do that as that’s up to you. OvuSense offers you extremely accurate information about your cycles that you can ‘do’ something with, even if that information isn’t great news. OvuSense is the only fertility monitor that will tell you if you have, and have NOT, ovulated each cycle with 99% clinically proven accuracy. Finding out you haven’t ovulated consistently isn’t great news and that’s why we created the ‘OvuSense Ovulation Promise’. If you use OvuSense for 6 cycles in a row, without a confirmed ovulation each time, we will offer you your money back (conditions apply, read here for more information). If you are not ovulating consistently, you need help to get you on your way, so reimbursing you the cost of OvuSense may help towards that. That’s our promise to you.

  • App and data security

  • Data security at OvuSense is the highest priority, your data is stored in an encrypted format in the cloud meaning they are much more secure. The cloud database used complies with strict regulatory guidelines which includes security management as per ISO 27001 and personal data protection as per ISO 27018.

  • The data can only be seen by the users you have chosen to share your data with and the OvuSense Technical Support team. If you contact us with a question, our support team may view your data if doing so is necessary to solve your problem.

    We keep your Personal Information confidential and generally do not disclose it. Please note that we do not sell your Personal Information to any third parties, nor do we share your information to social networks or other public places unless we have received prior consent from you.