IVF (on spontaneous cycle)

In vitro fertiliziation and embryo transfer without hormonal stimulation

IVF (In Vitro Fertilization and Embryo Transfer) on spontaneous cycle

It consists of an in vitro fertilization with embryo transfer without hormonal stimulation, followed by removal of the oocyte, it’s in vitro fertilization (in the laboratory) with her partner’s sperm and the subsequent transfer of the embryo in the uterus.

This technique is indicated in case of:

  • any contraindications to the use of hormones
  • medical indication (poor ovarian response)

The fundamental stages of spontaneous cycle of IVF are:

Preparatory phase

The previous month the egg retrieval, the patient performs the transfer test, the partner spermiogram, bacteriology and testing of sperm DNA fragmentation.Ultrasound by the 5th day of the cycle must communicate the results within 14:30 – See information in the documentation given to the couple during the first interview. The ovarian situation is monitored with transvaginal ultrasound and hormonal blood samples to assess the growth of follicles.

Oocyte retrieval (Pick-up)

Induction of ovulation with drugs on medical advice with a consequent oocyte retrieval through trans vaginal ultrasound. Being a very quick and virtually painless procedure.


The oocyte or oocytes retrieved are placed in a culture plate together with the partner’s sperm adequately prepared to achieve fertilization. After approximately 20 hours, it is determined the development of zygotes (eggs that have the two procell of maternal and paternal origin, not yet fused together). For Swiss law can inseminate all mature oocytes retrieved. The fertilization rate average is about 70%. The fertilized eggs, called zygotes, intended for transfer are left in culture for another 24-48 hours becoming embryos of 2-8 cells.

Embryo transfer

The embryo or embryos are transferred into the uterine cavity through a thin catheter. The transfer is quick and painless (without anesthesia) and the hospital stay is about 15-20 minutes. Over the next 3-4 days you should avoid sports and overexertion.

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