Zetek's Electrolyte Method

Zetek discovered and patented the Electrolyte Method™ for predicting ovulation. In studies overseen by the National Institutes of Health, Cue products using the Electrolyte Method have been shown to predict ovulation with 98.3% accuracy.

Throughout your monthly cycle, your body retains or discards varying amounts of minerals like sodium and potassium (electrolytes). The OvaCue® Fertility Monitor tracks the changes in these electrolytes in your saliva over time and processes this information to precisely define your time of peak fertility.

About a week before ovulation, a high point in the salivary readings of electrolytes is reached, corresponding to the release of the dominant follicle (ovum) and the Cue Peak measured by the OvaCue. This is what allows the OvaCue to provide an accurate prediction of ovulation several days in advance.

As you get closer to ovulation, your body begins to produce estrogen, causing a definite change in the electrolytes in the reproductive tract.  Estrogen secretion increases and the electrolyte content of the vaginal mucus changes, causing the OvaCue readings to drop.  About 12-24 hours before ovulation your body switches to Progesterone dominance, causing a sharp increase in vaginal readings, which confirms ovulation and marks the closing of your fertile window.