Control of ovulation

The aim of ovulation control is two-fold:

  • To prevent and avoid excessive risks: for this, it is very important to correctly adjust the dose depending on the number of eggs growing in the ovaries. The development of many ovules may lead to the appearance of various complications including ovarian cysts and/or multiple pregnancies. If the ovules fail to grow, feelings of frustration may follow.
  • To establish with greater certainty the most fertile days to achieve pregnancy.

Ovulation is controlled with the following tests: 

  • Vaginal ultrasound:
    This is used to view the ovaries, and to verify the size and growth rate of the follicle or follicles inside the ovaries (each follicle contains one ovule). The follicles increase in size as they mature. They are considered mature (ready to ovulate) when they reach a minimum size of 18 millimetres in diameter.
  • Blood test: 
    This is used to check blood estrogen (estradiol) levels. This female hormone is produced in the ovaries and the levels increase as the ovule or ovules grow inside the follicles. It is used to maintain stricter control over how the patient is responding to the stimulation treatment. 

The first control test is conducted between 5 to 7 days after the initial induction treatment, generally on day 8 or 9 of cycle. Depending on how the ovaries respond to the treatment, the date of the next control and the dose necessary are established. On average, 3 to 4 controls are conducted per treatment cycle. The period between the first and last control is about 4 to 10 days.

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