Fet fertility5/6/2023 Up to the point of egg retrieval, fertilisation and five to six days’ development, the medication is the same.During the five to six days that they develop under observation, the patient’s uterus is prepared with further hormonal medication to ensure the right environment to support a pregnancy. This induces maturation of the oocytes and 36 hours later, the eggs are collected. ![]() Once an ultrasound scan confirms that they have reached the optimum stage of development (follicle size being 16 mm), a dose of the hCG hormone is given. For a normal IVF cycle, usually 10 to 15 days of hormonal treatment is needed to stimulate the ovaries.However, in general terms, there are some significant differences in the type of medication required. The exact treatment will be decided in our clinic by your medical team. There is no one-size-fits-all protocol for IVF treatment for either type of transfer because the particular responses and needs of each patient are different. Why is the hormonal medication protocol different? This means that you will have access to embryos that date from a younger age, no matter how long you choose to wait. You may choose to freeze all of the embryos resulting from your IVF treatment because of your personal circumstances, to await a suitable time to start or extend your family.During this time, the embryos are frozen for a period of one or more menstrual cycles. This is to allow recovery from the hormonal stimulation and allow the lining of the uterus time to return to a more natural state where it can be more receptive to an embryo. For some patients, it is advisable to ‘rest’ between the ovarian stimulation/egg collection stage and the subsequent embryo transfer.Although the time lapse is brief, this still qualifies as a frozen embryo transfer. When these are available, a genetically healthy embryo is selected for transfer to the uterus. All of the blastocysts are therefore frozen awaiting results. After the biopsy, it can take 10 to 15 days for results to be available. If there is a medical need for various types of genetic testing, the tests are carried out after five days of development.They are then observed while they develop for five to six days to the blastocyst stage. When they are mature, these eggs are retrieved for fertilisation in the laboratory. The patient is given hormonal medication to stimulate the ovaries to produce more than the normal single egg per menstrual cycle. In vitro fertilisation (IVF) starts the same way for everyone. What is the difference between fresh and frozen embryo transfer? We also explain how the decision is made about which cycle day the frozen embryo transfer is made, the symptoms you can expect following the procedure, and the pregnancy test after an IVF frozen embryo transfer. These include differences in the hormonal medication protocols involved and the choices available to the patient for the timing of their treatment, as well as the timing of the subsequent embryo transfer. In this article, we aim to explain some of the differences between these two well-established assisted reproduction techniques. ![]() There are many aspects of frozen embryo transfer which are different to fresh transfer, as well as many similarities.
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