Ovulation Fertility Strips 20mIU Home Urine Tests Kit - One Step Feature and Benefits These One Step tests are the more economically priced, thinner (2.5mm) strip tests. ARTG Number 290801 Number 1 seller in Europe - Test foils are in 5 different languages - English, French, German, Italian & Spanish All tests are individually foil wrapped and sealed with long expiry dates One Step Ultra Early Ovulation Tests at 20 mIU/mL - more sensitive to ensure you don't miss the LH surge Ovulation Tests A pregnancy begins with conception. A child is conceived when the male sperm successfully fertilises the female egg. Successful fertilisation is most likely during a 24-hour period following the LH surge. Since this window is usually only open once a month and for a short period of time, being able to predict the LH surge is very helpful when trying to become pregnant. We have selected these ovulation tests for their price, accuracy and reliability. These tests look for the presence of LH in urine. How does a home ovulation test work and what is the LH surge? When a woman is about to ovulate, her body releases a large amount of a hormone called LH (Luteinising Hormone). LH is always present in your urine but the levels increase (surge) in the middle of your cycle, causing you to release an egg from the ovary. This process is called ovulation. If the LH surge is present, ovulation is likely to occur in the next 12 to 36 hours. Our ovulation tests detect the LH surge by measuring the level of LH in urine. Once ovulation has taken place the level of Progesterone increases and this causes the basal body temperature to rise. When should I do the test? To determine when to begin testing, you need to work out the length of your menstrual cycle. The length of your cycle is from the first day of your period to the last day before your next period starts (count the first day of bleeding as day 1). Calculate what the usual length of your menstrual cy