Transfer of cryopreserved embryos

In IVF treatment, several eggs are aspirated and fertilized with your partner’s sperm or donor sperm. One of the fertilized eggs is placed back in the uterus. The remaining fertilized eggs, which are also suitable for transfer, can be frozen and used for future treatments.

Legislation on egg freezing

In Denmark, fertilized eggs can be frozen for a maximum of 5 years. The embryos are destroyed automatically after 5 years. If the woman to whom the eggs belong reaches the age of 46 before the 5-year freezing period has elapsed, the eggs are automatically destroyed when the woman reaches the age of 46. (September 2020. The Danish government is going to discuss an extension of the storage period for up to 10 years).

The frozen embryos can be exported to another country before the 5-year storage period expires or before the woman turns 46 years old. Abroad, the rules for storing frozen eggs are different. If the eggs are not transported abroad, the eggs are destroyed automatically.

FET treatment (Frozen Embryo Transfer) – step by step

  • On your first menstrual day, call the clinic.
  • The secretary instructs you to start either a hormone-controlled FET treatment or a freeze treatment in your own cycle (without hormones).
  • If you live abroad, please, inform us of your plans to start a FET treatment approximately 2 weeks earlier, so we can send you the necessary prescriptions.

Hormone-controlled FET treatment

  • You must start on Estrofem / Estradiol on your 2nd or latest 3rd day of your period. Estrofem / Estradiol is placed on the prescription server (if you live in Denmark) and you can pick it up the same day after 4 pm.
  • Estrofem / Estradiol holds back your own ovulation and helps to make the lining of the uterus grow.
  • You are booked for an ultrasound scan at the doctor’s approximately cycle day 10 – 12. At this scan, the doctor measures the thickness of your uterine lining. If the endometrium is thick enough, the transfer of the frozen embryo can be planned. The transfer takes place approximately one week later. If the endometrium is not thick enough, continue with the Estrofem / Estradiol treatment. If you live abroad, send us the result of your ultrasound scan before 2 PM.
  • It is important that you have signed an informed consent to thaw the embryo before embryo transfer. If you have a partner, he / she must also sign the informed consent. We need your consent not later than 3 days before the planned transfer date. The embryo cannot be thawed unless we have your informed consent.
  • When the transfer day is planned, you will be informed on when to start Progesterone treatment. Progesterone (Crinone, Cyclogest, Duphaston, Lutinus or other) matures your uterine lining so that the embryo can implant into the endometrium.
  • The doctor will book an appointment for you for embryo transfer. The procedure takes about 15 minutes. You must come with a full bladder on the day of embryo transfer. When you have a full bladder, it helps the doctor visualize your mucosa on the ultrasound scan during the procedure.
  • Approximately 2 weeks after embryo transfer, you will receive a serum hCG (pregnancy blood test), which shows if you have become pregnant. If you are pregnant, continue taking Estrofem and Progesterone until you are 10 weeks pregnant. 3 weeks after a positive blood test, we can book you for a pregnancy scan.
  • If you have unfortunately not become pregnant, you can start a new FET treatment when your bleeding starts.

FET treatment in your own cycle

  • You are booked for an ultrasound scan with the doctor on your cycle day 10 – 14. With this scan, the doctor measures the size of your follicle and the thickness of your endometrium. If you live abroad, send us the result of your ultrasound scan before 2 PM.
  • When your follicle is ready for ovulation, take an ovulation injection (Ovitrelle). The transfer of your frozen egg takes place 7 days later (blastocysts only).
  • It is important that you have signed an informed consent to thaw the embryo before the embryo transfer. If you have a partner, he / she must also sign the consent form. We need your consent not later than 3 days before the planned transfer date. We cannot thaw the embryo unless we have your consent to it.
  • The doctor will book an appointment for your embryo transfer. The procedure takes about 15 minutes. You must come with a full bladder on the day of embryo transfer. When you have a full bladder, it helps the doctor visualize your mucosa on the ultrasound scan during the procedure.
  • Approximately 2 weeks after embryo transfer, you will receive a serum hCG (pregnancy blood test), which shows if you have become pregnant.
  • If you have unfortunately not become pregnant, you can start a new FET treatment when your bleeding starts.

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