 The Clearblue Fertility Monitor is a personal monitor designed to be used with disposable test sticks for the semi-quantitative measurement of estrone-3-glucuronide E3G and luteinising hormone LH in womens urine. This personal information allows women to identify their fertile window and appropriately time intercourse in order to maximise their chances of conception. A new version of this monitor Clearblue Advanced Fertility Monitor has been developed with additional functionality including the option to test for pregnancy. 