Contains a certain amount of normal female urine luteinizing hormone (LH hormone), in the middle of menstrual cycle luteinizing hormone value will rise suddenly, thereby stimulating the release of an egg is mature ovarian ovulation.
The menstrual cycle length in women of childbearing age, but the time interval between the next menstruation and ovulation, start relatively fixed, usually two weeks, that is to say fourteenth days after ovulation is menstruation, menstruation if from the day before the date, the last 14 days is the last day of ovulation.
But how many days are ovulation days from today? I'm afraid no one can answer it correctly. Many factors can lead to early or late ovulation, including emotional stress, illness, environmental changes, etc..
Through the detection of female urine, determination of luteinizing hormone (LH hormone) is one of the most reliable method for accurate determination of ovulation. The key is ovulation occurs after the LH hormone peak of 9.5 to 23 hours, but not before, LH can accurately know the hormone peak "ovulation" for eugenics, guide safe period contraception and infertility.