1. In the first 2 cycles of use. Robinson JE, et al. Fertility and Sterility (2007) 87: 329-334
2. In a study of 87 women, 4 or more fertile days were identified in 80% of cycles using actual cycle length.
Clearblue advisors answer your most important questions on fertility, pregnancy and contraception.
The World's No 1 selling brand*
In Clearblue we have more than 25years of innovation. That’s why 20 million women choose Clearblue products every year and 13million women visit our website to find the answers they need. Find out more about Clearblue
*in home pregnancy & fertility tests. Based on international sales in nearly 20 countries compiled using independent market research data.