In the female body during the month there are many changes that are associated with the work of the reproductive system. For example, 10-16 days before the onset of menstruation, after ovulation, the luteal phase of the cycle begins.
The menstrual cycle is divided into two main phases: before ovulation - follicular and after it - luteal. The phase preceding ovulation can last for a different time period, and not only for different women, but for each of them. As a rule, it is this phase that determines the duration of the entire cycle, and the delay in menstruation depends on it, since the phase of the corpus luteum is almost always unchanged.
Phase of the corpus luteum
The luteal phase of the cycle can normally last 12-16 days, but generally lasts no more than fourteen days. If the corpus luteum does not function sufficiently, then a shortening of the luteal phase is possible. It should be noted that such a feature of the body may be one of the causes of miscarriage in the early stages. This problem can be diagnosed only with the help of ultrasound and a blood test for progesterone. Thus, the luteal phase is determined, whichthe day of the cycle and is the level of the hormone in the woman's body normal.
As a rule, after establishing the cause and treating the primary disease, the level of progesterone in the body returns to normal. But in some cases, a woman is prescribed progesterone preparations and stimulation of the corpus luteum with preparations containing human chorionic gonadotropin.
When pregnant or in the presence of a corpus luteum cyst, the duration of the luteal phase may increase. Basically, treatment in this case is not required, such a cyst passes without intervention.
What characterizes the luteal phase of the cycle
The corpus luteum phase begins immediately after ovulation. The release of luteinizing hormone during this period of the menstrual cycle stops, and in the follicle from which the mature egg comes out, the corpus luteum begins to function. It is on him that the production of the hormone progesterone and the normal development of pregnancy depend. From the moment of ovulation, the progesterone norm ranges from the lowest indicator - 6.99 to the highest value - 56.63 nmol / l. This is the luteal phase of the cycle. On the seventh day, progesterone starts to build up, and its level gradually decreases towards the beginning of the next period.
In the same period, the uterine lining will actively grow in the uterus. In the first half of the menstrual cycle, its active growth is noted due to an increase in hormone levels, but after the arrival of ovulation, it becomes more dense and absorbent. Thanks to this, a fertilized egg, getting into the uterus, will be able to freely infiltrate intothis mother layer.
The luteal phase of the cycle is a kind of waiting mode in which the body is. He is ready to bear a child and produces hormones that will help maintain the embryo in the first few weeks after fertilization. But if, by about the tenth day, a fertilized egg does not implant in the uterus, then the corpus luteum begins to die off, progesterone levels decrease, the uterine lining is shed, and menstruation begins.
