As I am sure you are aware a woman's fertility starts to decline after she gets to 30 but what you probably did not know is that the hormone F.S.H. (follicle stimulating hormone) is intimately involved with a woman's fertility and rising levels tend to be associated with reduced fertility. F.S.H. is the hormone that maintains the regular function of your ovaries and sex hormones it is a useful aid to assessing your fertility.This test is especially useful for women with irregular cycles and women aged 30 or over. 2 tests are included and if both test results are positive it is an indicator of reduced fertility.