For women with irregular periods, it is recommended to take basal body temperature for at least one cycle first. Then seek medical attention. Or take your own measurement while you are at the doctor’s office. It is most accurate to take the measurement in the morning without drinking or going to the toilet, but without any activity. The measurement is recorded and then connected to a line to reflect the endocrine situation. In 1868 and 1878, British and American doctors recorded the temperature of women early in the morning and found that a physiological cycle (from one period to the next) was divided into two distinct phases, the first slightly lower and the second slightly higher; but it was only at the beginning of the next century that a Dutch scientist discovered that this change was related to ovulation, so he painstakingly studied it for more than 20 years and determined that the increase in body temperature in the second half of the cycle was due to rapid changes in hormone levels after ovulation. This interval of high body temperature can be said to be a direct indication of ovulation, as it is caused by rapid changes in hormone levels. In the 1830s, Japanese and Austrian scientists made another miraculous discovery: although the cycle varies from woman to woman, the second half – the 12-16 days between ovulation and menstruation – is always more variable than the period after menstruation to ovulation. In 1935, a German priest had the idea that since basal body temperature changes subdivide the month precisely, why not use basal body temperature changes instead of the menstrual cycle to determine the period of conception and infertility? So in the 1940s and 50s, scientists worked on developing a simple method based on basal body temperature. They tracked thousands of women and kept revising it, and finally simplified it to the “3 followed by 6” rule, where a couple only needs to see that the woman’s body temperature has risen and remained for 3 days, and that the previous 6 days were at a low stage, which means that ovulation is complete and the cycle is no longer fertile, because the egg cell can only live for 1 day after ovulation. . In 1970, scientists continued their observations and published a method to determine ovulation by cervical mucus, also known as the leucorrhoea. This method was also so accurate that some medical institutions suggested using body temperature in combination with the leukorrhea to add a layer of insurance in determining ovulation. However, the leukorrhea method never seemed to be as widespread as the cycle and temperature method. By the 80’s and 90’s, people knew enough about how to have a baby to start focusing on the condition of not having a baby; in addition, advances in biotechnology allowed scientists to more accurately determine ovulation through hormone levels in blood and even urine. The dawn of the ovulation test has arrived! It can help couples to more accurately capture the timing of conception within a cycle, as well as detect non-ovulation. (The above is reprinted from the Scientific Pines Society) For the form below, press the print icon in the upper left corner and select the current page to print directly online.