The Austrian gynecologist Hermann Knaus first demonstrated at a gynecologist's congress in Leipzig 90 years ago that in the monthly cycle of a woman there are specific times when she can become pregnant. He was able to show that each month women have fertile and infertile days. 

Around the same time, the Japanese Kyusaku Ogino made the same discovery. It was a sensation.

Until then, people believed that women could become pregnant at any time!

Ogino examined the ovaries as part of gynecological operations. Knaus discovered the laws through physiological experiments. In 1923, Ogino published that ovulation was related to the subsequent menstruation and not to the previous one. Knaus contributed essential findings on the duration of ovum fertility and the ability of sperm to fertilize.

The Knaus-Ogino method is based on the assumption that the duration of ovum fertilization is only ten hours . At the same time it is assumed that sperm has a maximum lifespan of three days and the luteal phase after ovulation lasts exactly 14 days (+/– 2 days).Therefore, the time frame with the highest likelihood for a pregnancy is limited to a few days each month. Assuming the woman has a relatively regular cycle.

Before the Knaus-Ogino method can be used safely, the woman first needs to count and document the number of days from one menstruation to the next for about a year. Then the average cycle duration will be calculated. This way the highest probability for the time of ovulation can be determined. However, the aggregated 12-month data doesn't document any patterns arising from the documentation.

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to cylceduc®

count backward, plan forward

With cycleduc® the Knaus-Ogino method becomes more granular, because all cycles, longer or shorter, are visible and show the complete range of cycle variations as well as cycle rhythms.

The big advantage of cycleduc® is that no averages are formed and they are not used to predict a possible future ovulation.

Basically, every day in a woman's cycle is documented individually. In the first step, the only distinction is between days of bleeding (red) and days without bleeding (white). In the second step, at the end of each cycle, the potentially fertile days of that cycle are marked in color (green) after counting backwards (15 days). This is repeated cycle by cycle.

Each cycle image allows individual conclusions about interpretation: regular or irregular cycles can occur, as can patterns in the variation of cycle lengths that follow a certain rhythm. Visually, the women can be given an intended frame around the green crosses, which can be narrow or wide or follow a zigzag pattern. This visual approach enables a very easy-to-understand yet meaningful, self-based prediction of fertile days.

Clear advantage: Women receive an increasingly accurate cycle picture, which enables a more and more precise prediction of the fertile and infertile days as well as the beginning of the coming menstruation.