Embryo transfer
How is embryo transfer prepared?
Embryo transfer (ET) is the introduction of embryos into the mother’s uterus. Just before the embryo transfer, selected embryos are placed in specific culture medium. The embryos are loaded onto the end of the transfer catheter and gently deposited into the uterine cavity.
Embryo transfer can be performed under ultrasound guidance to visualise the endometrium and deposit the embryos 1 cm from the uterine fundus. It is usually performed on the fifth day, when the embryo reaches the blastocyst stage. In some cases it is done three days after the ovarian puncture.
Which embryos are selected for transfer?
The best quality embryo is transferred and, in exceptional cases, up to two embryos can be transferred. However, at Institut Marquès we advise transferring only one embryo to avoid multiple pregnancies and possible complications during the gestation process.
What happens to the embryos that are not transferred?
The embryos not transferred to the uterus, as long as they have a good morphological aspect, are frozen for subsequent cycles. If they present poor morphology, they are kept in sequential culture and if they develop to blastocyst, they can then be frozen.
The transfer of frozen embryos
How is frozen embryo transfer performed?
To optimally prepare the endometrium and thus improve the chances of pregnancy, medication in tablet or transdermal patch form (oestradiol valerianate) and vaginal tablets (progesterone) is prescribed for approximately 15 days.
The transfer can be scheduled for the day of the patient’s choice.
CRYOTRANSFERS SUCCESS RATE
| Institut Marquès | |
| Pregnancy / transfer | 56,5% |
| Clinical pregnancy | 47,7% |
| Born | 37,1% |
| Twin pregnancy | 2,9% |
Cryotransfers refers to the transfer of an embryo from the couple’s own embryo after it has been frozen.
