Identifies 2 most fertile days, so can maximize chances of getting pregnant naturally. Only ovulation test to accurately track 2 key fertility hormones. Easy to read--unique digital smiley face results. Can adjust every day test according to your unique hormone profile. Clearblue ovulation test is over 99% accurate at detecting the LH surge. Planning for a baby its important to know that womens cycles vary from month to month and every womans cycle is unique.