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family of ovulation prediction products, since 1983.

The accuracy of the Electrolyte Method, which is used only by OvaCue and other Zetek products, has been established through the analysis of over 2,000 ovulatory cycles in scientific studies, some supported by the National Institutes of Health.

See the bibliography of studies evaluating the Electrolyte Method.

Fertility and Conception —>

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% accuracy.

Learn more about the OvaCue Fertility Monitor.

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.

A few days after the Cue Peak, the luteinizing hormone (LH) in the blood increases and then decreases very sharply over a period of 24 hours (the LH surge). As LH reaches its peak in the blood, there is a definite change in the reproductive tract. Mucus secretion increases, and the electrolyte content of the mucus changes. Measured by the Cue vaginal sensor, this drop and subsequent rise in electrolyte readings gives positive confirmation of ovulation and marks the end of your fertile window.