Clearblue Advanced Fertility Monitor Refill Test Pack contains 20 fertility tests and 4 pregnancy tests, individually wrapped. The Clearblue Advanced Fertility Monitor is NOT included in this pack. The Fertility Test Sticks from this pack can only be used with the Clearblue Advanced Fertility Monitor (sold separately) or the Clearblue Fertility Monitor; they don’t work with our other Clearblue Ovulation Tests. The Pregnancy Test Sticks from this pack can only be used with the Clearblue Advanced Fertility Monitor (sold separately). The majority of women will need 10 test sticks each cycle. Women with irregular or long cycles may have to use 20 test sticks. Clearblue Advanced Fertility Monitor (not included, sold separately) is proven to increase the chances of getting pregnant naturally by 89% (1). It is designed to identify all your fertile days, typically up to 6, which is more than traditional ovulation predictor kits that detect LH only. It is discrete, feminine, and handheld, and tracks two key fertility hormones, estrogen and luteinising hormone. It shows your fertility information on the easy to use touch screen as well as summarizing up to 6 cycles data on one screen for easy comparison. Clearblue Advanced Fertility Monitor is also the only monitor to enable you to test for pregnancy. It’s over 99% accurate at detecting pregnancy from the day your period is due. It also predicts when you can test – up to 3 days before your period is due. (In clinical testing with early pregnancy samples Clearblue Advanced Fertility Monitor gave the following results: 96% of women received a ‘pregnant’ result 1 day early, 91% of women 2 days early, 74% of women 3 days early.) (1) In the first 2 cycles of use. Robinson JE., et al. Fertility & Sterility (2007) 87: 329-334.