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family of ovulation prediction products, since 1983.

Rental program

If you feel you would like to use a fertility monitor on a trial basis, you can rent a Cue II from us. There's no risk—return the monitor whenever you like.

$45 a month, plus deposit

Download a Cue Chart (pdf)

Still Going: the Cue II

The Cue II is an earlier model in the Cue line, introduced in 1999. Cue II features the same sensitive electronics as the OvaCue for monitoring changes in your body.

The OvaCue and the Cue II both use Zetek's patented Electrolyte Method for measuring changes in the body associated with ovulation. They use exactly the same sensors.

The OvaCue is a significant advance in that it does the calculations for predicting and confirming ovulation itself and reports a visual indicator of your fertility status for the day and a projected date of peak fertility. OvaCue also tracks and stores information about your cycles for up to 4 months automatically in its internal memory chip

With the Cue II, you record daily readings on a Cue Chart and interpret the pattern according to instructions. Keeping and interpreting a chart is not difficult, it just requires a little extra effort. Combining the vaginal sensor with either device allows you to completely define the fertile window.

Cue Charts

Users of the Cue II need to download Cue Charts and learn how to track and interpret their readings. This is explained in detail in the Owners Manual.

In brief, the user plots a numeric reading on a Cue chart each day. About a week before ovulation, electrolytes such as sodium and potassium change markedly. It is this Cue Peak on the graph that announces the beginning of the ovulatory process.

A few days after the Cue Peak, the luteinizing hormone (LH) in the blood increases and 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 which can be measured by the Cue vaginal sensor. Mucus secretion increases, and the electrolyte content of the mucus changes. This change causes a sharp, clear drop and increase in these readings. It is this nadir and subsequent rise that the Cue uses to confirm ovulation.