The Science Behind OvaCue
The OvaCue predicts ovulation using the patented Electrolyte Method™ - a technique that has been demonstrated to be 98.3% accurate in predicting ovulation in clinical studies overseen by the National Institute of Health.
Here's how it works: Throughout your monthly cycle, your body retains or discards varying amounts of minerals, such as sodium and potassium (electrolytes). The OvaCue tracks the changes in these electrolyte levels 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 with the maturation process of the dominant follicle (ovum). The measurement of this phenomenon 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.
How To Use the OvaCue Fertility Monitor
While the science behind the OvaCue Fertility Monitor may be complex, actually using it to predict fertility is quite simple.
Starting on day two of your cycle, place the spoon-sized sensor on your tongue for three seconds first thing each morning before eating, drinking, or brushing your teeth. The OvaCue takes your electrolyte reading and automatically computes:
- Your current cycle day
- Your fertility status for today (darker colors equal higher fertility)
- Your peak fertile days for this cycle (the days in which you have the best chance to conceive)
- The day you actually ovulated (this function requires the vaginal sensor)
- The start and end of your fertile window (the range of days in the cycle you are most likely to conceive)
The OvaCue tracks your readings in memory and indicates your most fertile period, beginning five to seven days before ovulation until ovulation occurs.

Interpreting your personal ovulation calendar: |

| Possible fertility |

| High fertility |

| Peak fertility |

| Ovulation confirmed (requires vaginal sensor; marks end of fertile period) |
| |
In short, the OvaCue takes the guesswork and stress out of identifying your most fertile days of the month. With the OvaCue, you can plan up to a week in advance for the best chance of conception.
When trying to conceive, plan to have intercourse daily on the days the OvaCue defines as high and peak fertility. Remember that you must have intercourse before ovulation in order to conceive. If your menstrual period does not begin within two to three weeks, a pregnancy test may be in order.
The OvaCue monitor stores up to four months of readings, which can be viewed with a simple touch of a button. In addition, at OvaGraph.com, a free online carting website dedicated to the OvaCue Fertility Monitor, you can enter your OvaCue readings, store an unlimited number of cycles, track several other fertility methods, and connect with an entire community of trying to conceive women.