The first day of menstruation is the first day of the cycle (day 1).
The cycle is divided into two phases: the follicular phase and the luteal phase.
- The follicular phase begins with the onset of menstruation and ends prior to the elevation of luteinizing hormone (LH) day.
- The latea phase begins the day when LH increases and ends when the onset of menstruation appears.
The menstrual cycle in a woman lasts on average 28 to 35 days
With follicular phase of 14 to 21 days and 14 to the luteal phase. There is little variability in cycle length in women aged 20 to 40 years compared, there is a greater difference in the duration of the cycle in the first 5 to 7 years after the first period and in the last 10 years before the disappearance Of the same.
In general, the length of the menstrual cycle reaches its peak at the age of 25 to 30 years and then gradually decreases in duration, so women who are in their 40s have shorter and less abundant cycles. The duration changes in menstrual cycles are mainly due to the follicular phase, because the luteal phase remains relatively constant.
Progesterone.
What is it for?
- Used in in vitro fertilization.
- Used to reduce endometrial changes if the woman is receiving estrogen therapy.
- Used to treat dysfunctional uterine bleeding due to hormonal changes.
- Used to treat women who have regular menstrual cycles.
- It can be used in other cases.