Clearblue Advanced Digital Ovulation Test typically identifies 4 or more fertile days and over 99% accurate. Clearblue Advanced Digital Ovulation Test is the only test to typically identify 4 or more fertile days when you have the best chances to get pregnant naturally. By accurately tracking 2 key fertility hormones, estrogen and luteinising hormone, it identifies 2 peak fertility days, like all other ovulation tests, but also additional high fertility days before that. This means you have more opportunities to get pregnant – at least twice as many as with any other ovulation test. Because your partner’s sperm can survive in your body for up to 5 days, you can actually become pregnant by having intercourse during the days leading up to ovulation. Have intercourse on high and peak fertility days to maximise your chances of getting pregnant naturally. The clear digital display gives you a Clearblue smiley face when it identifies your best days to get pregnant so you know your body is ready. Clearblue digital tested over 99% accurate at detecting the LH surge. To make it easier for you to find the right product, please note that Clearblue Advanced Digital Ovulation Test in the past was also called Clearblue Digital Ovulation Test with Dual Hormone Indicator.