In both types of cycle progesterone is given in the form of pessaries, which ensure that the lining of the womb is supportive to the blastocyst.Your will be prescribe a personalised plan of medication, which typically involves estradiol tablets or patches to develop the lining of the womb, followed by progesterone to support implantation. Programmed cycle – this is appropriate for women who do not have regular cycles and involves using medication to prepare the lining of the womb for implantation.Following ovulation, the thaw and embryo transfer can be scheduled at the most favourable time for implantation. Ovulation is detected using testing sticks during a natural menstrual cycle. Natural cycle – this is appropriate for women who have regular cycles and ovulation.Ultrasound scans are undertaken during the cycle to ensure that the thaw and transfer takes place at the optimal time. There are two main methods for the lining of your womb to synchronize with the blastocyst transfer. The is known as a FET – Frozen Embryo (blastocyst) Transfer. How does one prepare for receiving blastocyst? However, lower quality blastocysts, which did not meet the laboratory criteria for freezing, have a lower chance of survival. We have refined our techniques over a number of years, and we have excellent survival rates of over 97% for good quality embryos. The freezing and thawing processes are not without risk and in a small percentage of cases the blastocyst does not survive the thaw. What proportion of blastocysts survive the thawing process? This means that the blastocyst does not age and success rates will be in line with your age at the time the blastocyst was stored, regardless of when the thaw and FET takes place. Freezing stops all activity in the blastocyst cells. UK law permits Blastocysts to be stored for up to 10 years, and longer in exceptional circumstances. In the hours that follow, the blastocyst should return to its original state ready to be transferred. On the scheduled day of FET, the device containing the blastocyst is taken out of the liquid nitrogen and rapidly warmed to 37 oC before being washed through a series of solutions to help it to recover. Each blastocyst is stored in an individual, sealed and labelled straw. This involves moving a blastocyst through a series of protective solutions, using very precise timings, and instantly cooling to -196 oC in liquid nitrogen. They are frozen using a ‘flash-freezing’ method known as Vitrification. Frozen embryo transfers have comparable success rates to those with fresh embryosĮmbryos are frozen on day 5 or 6 of development once they have reached the blastocyst stage.These embryos can stored and transferred to your womb at an appropriate time.Modern freezing techniques allow embryos to be safely frozen following IVF or ICSI treatment.HFEA statement on fertility treatment services.Pre-implantation Genetic Screening – PGS.Understanding the Sperm test and Male infertility.
0 Comments
Leave a Reply. |