No. 1 ob-gyn recommended brand (Data on file. Research into recommendation of Ovulation Tests and Fertility Monitors with 204 US Ob-Gyns. (Kantar Health 2011)) No LH surge. LH Surge. 2 Identify your most fertile days. Over 99% accurate (Accurate: It's over 99% accurate at detecting the LH surge. Hormones are a more accurate predictor of ovulation than Basal Body Temperature, which only changes after ovulation.) Data on file. Clearblue Ovulation assay showed 97% agreement with ultrasound observed ovulation. 1. Natural: The test detects a hormonal surge (LH, luteinizing hormone) in your urine, which occurs prior to ovulation. Make love at any time in the next 48 hours starting from the first smiley face to maximize your chances of becoming pregnant naturally. Easy: Insert the test stick into the test holder. Then, simply hold the tip downwards in your urine stream for 5 seconds. Please read enclosed instructions before use. Clear: Gives clear digital results. Accurate: It's over 99% accurate at detecting the LH surge. Hormones are a more accurate predictor of ovulation than Basal Body Temperature, which only changes after ovulation. Contents: 1 test holder, 10 test sticks, and 1 English/Spanish insert. www.clearblue.com. facebook.com/clearblue. twitter.com/clearblue. Clearblue Helpline Monday-Friday 8:30 a.m. - 5:00 p.m. Eastern Time. Toll-free. 1-800-321-3279 Please have the lot numbers (LOT) from both the outer and inner packaging. Calls are recorded for training and quality control. Also try our digital pregnancy test! Holder made in China. Packaged in the USA.