Quantity of ova
Quantity of ova
The quantity of follicles a woman has in her ovaries is called ovarian reserve. This ovarian reserve start decreasing before becoming sterile o having irregular periods.
Women are born with all the follicles they will have throughout their life and these ones will decrease gradually. As follicles decrease, they become less sensitive to the stimulation of FSH/HFE, and will need more stimulation to get the follicle and ovum mature.
At the beginning periods may get shorter, giving rise to cycles with a difference from 21 to 25 days. Eventually, follicles become incapable of responding well enough to constantly ovulate, giving rise to long and irregular cycles.
A decreased ovarian reserve is usually related to women’s age because of the natural loss of ova as well as their quality.
However, young women can have decreased ovarian reserve because of tobacco use, family history of premature menopause, or previous ovarian surgeries. Young women may experience a decrease in their ovarian reserve even if they do not have known risk factors.
Gynaecological examinations are recommended to measure the ovarian reserve, but none of them reliably predict the possibility of becoming pregnant.
una reserva ovárica normal.
These examinations do not determine whether a woman can or can’t become pregnant, but can determine whether age-related changes in the ovaries have started to appear.
Women with decreased ovarian reserve have less probability of becoming pregnant than women with normal ovarian reserved of the same age group.
There is no exact test or combination of tests that is 100% exact.
The analysis of FSH, anti-mullerian hormone and the levels of oestrogen are selection indicators to determine the ovarian reserve they obtain through the extraction of blood samples on days 2, 3 or 4 of the menstrual cycle. High level of FSH or oestrogen indicate that the ovarian reserve is low. However, a large number of women with decreased ovarian reserve have normal FSH levels on day 3, so an analysis of FSH of day 3 does not confirm a normal ovarian reserve.