Even now, 20 years later, the Marquette Method still uses the Clearblue monitor because it’s proven to be the best one to help women avoid pregnancy. They continue to research other monitors ( including the Mira monitor) as they become available, but currently only the Clearblue Monitor is compatible with Marquette. Mira Fertility Monitor Behre HM., et al. Prediction of ovulation by urinary hormone measurements with the home use Clearblue Fertility Monitor: comparison with transvaginal ultrasound scans and serum hormone measurements. Human Reproduction (2000) 12: 2478–2482. †

There are so many fertility monitors available—way more than there were just 5 years ago… which can make it hard to separate out the hype from what actually works.

Based on international sales in nearly 20 countries compiled using independent market research data.

Measuring your Basal Body Temperature. This is a popular method where you take your body temperature each morning before you get out of bed. You should see a rise in 0.4-1.0°C in your body temperature after ovulation. This method is not ideal because once you have seen this rise you have already ovulated. As the egg only survives 12-24 hours after ovulation it’s too late in this cycle to optimise your chances of getting pregnant. It takes several cycles to build up a picture of your fertility window, and body temperature can be affected by other factors, such as travel, sleep changes, and alcohol. This method has been shown to be less than 70% successful 4are using hormonal treatments, e.g. hormonal contraception, fertility treatments, hormone replacement therapy Data on file: In laboratory testing, the Clearblue® Fertility Monitor detected the LH surge in 169/171 cycles, in agreement with a quantitative radioimmunoassay. You can also use our when to start ovulation testing tool to find the right day to start testing for you. You just need to input your average cycle length, the day your last period started and which ovulation test you’re using. Which ovulation test is right for me? Already made your choice? Clearblue monitors are easy to find. Just about every drugstore carries it … but they tend to be a lot cheaper online. The menstrual cycle is controlled by the anterior pituitary gonadotrophins (follicle-stimulating hormone and luteinising hormone, LH) and the gonadal sex hormones (estrogen and progesterone) 3

I’m a nurse and fertility educator. I’ve taught over 300 couples how to manage their fertility naturally using the Clearblue Fertility Monitor. In my view, it still remains the best, most reliable fertility monitor on the market. Measuring your Basal Body Temperature. This is a popular method where you take your body temperature each morning before you get out of bed. You should see a rise in 0.4-1.0°C in your body temperature after ovulation. This method is not ideal because once you have seen this rise you have already ovulated. As the egg only survives 12-24 hours after ovulation it’s too late in this cycle to optimize your chances of getting pregnant. It takes several cycles to build up a picture of your fertility window, and body temperature can be affected by other factors, such as travel, sleep changes, and alcohol. This method has been shown to be less than 70% successful. 5 The LH surge is the best indicator of impending ovulation; it causes the dominant follicle to rupture and release a mature ovum. Ovulation typically occurs 24–36 hours after the LH surge, and will not occur in its absence. 9​ There are certain medical conditions and medications that can affect your fertility result. You may get misleading results if you:The Clearblue Fertility Monitor is robust and reliable—and that’s the main reason why Dr. Fehring and the developers of the Marquette Method chose this monitor over the others as the foundation for their next-gen form of NFP. In this article, I share information on the research and science behind the monitor which you won’t find anywhere else. Nepomnaschy PA., et al. Urinary hCG patterns during the week following implantation. Human Reproduction. (2008) 23: 271–277. Unique - the only monitor to provide daily fertility status by measuring two urinary hormones – LH and E3G I know a lot about the pros and cons of this particular device—including the science of how it works. It’s a solid choice for women and couples who want to increase their chances of getting pregnant.

Data on file. Laboratory Evaluation of Clearblue Fertility Monitor System Performance; 90 women contributed up to 5 cycles of daily early morning urine samples where the Clearblue Fertility Monitor system detected an LH surge, (352 cycles total) the range in cycle length was 22 to 40 days inclusive. It has been shown to accurately predict ovulation compared with serum hormone measurements and vaginal ultrasound scans 2,9 In a study of 54 couples who were seeking conception assistance, the Monitor identified a median of seven fertile days; more than 60% of cycles had between 1 and 5 days of high fertility, prior to peak fertility, over four cycles. 15 Clearblue ® launches the world’s first dual-hormone Fertility Monitor to indicate all the fertile days of the cycle. The Clearblue Advanced Fertility Monitor is suitable for women whose cycles normally last between 21 and 42 days. If your cycles are always shorter than 23 days or always longer than 37 days it may not detect your LH surge. To work out how long your cycle is note the day your period starts (first day of full menstrual flow) as day 1, and then count through to the day before your next period starts. The total number of days is your cycle length.Unique – provides daily fertility status by measuring two urinary hormones – LH and E3G and enables the user to test for pregnancy Some medications are contra-indicated in pregnancy. We recommend that you consult your doctor if you are taking any medication before you try to get pregnant.