Potential fertility--defining the window of opportunity.

The ClearPlan Easy Fertility Monitor predicts the times of high potential fertility, i.e. the times when sexual intercourse is most likely to result in conception. The test procedure identifies the times of specified changes in the concentration of urinary hormone metabolites during each ovarian cycle. The results are displayed in terms of prior knowledge about the time-specific probabilities of conception. This paper contains a summary of the scientific background that led to the development of the ClearPlan Easy Fertility Monitor.