What is embryo freezing and what kind of people are it suitable for?

Embryo freezing is the long-term preservation of embryos at ultra-low temperatures. It is more suitable for people who cannot have children for the time being and who do IVF.

It is a very high-tech technology, because this technology costs a lot of money, so it is more suitable for people who are older and have good economic conditions.

Embryo freezing is actually a very advanced technology, which can survive the relatively good embryos, and is suitable for people who are not planning to have children so soon.

IVF embryo transfer, fresh embryo or frozen embryo is betterDepending on the woman's physical condition, the one that suits her is the best.

For women with abnormal ovulation, frozen embryo transfer is preferred; For women who do not have factors that are detrimental to embryo transfer, a fresh embryo transfer is recommended.

Fresh embryo transfer refers to the process of transferring embryos directly into the uterus after being cultured in vitro; Frozen embryos, on the other hand, are the remaining embryos after the transfer of fresh embryos that are preserved by freezing.

Which has a higher success rate, fresh embryo transfer or frozen embryo transferThe success rate of fresh and frozen embryo transfer is similar.

Theoretically, frozen embryos have a slightly higher overall success rate because the endometrium is more prepared, which reduces the effect of hyperestrogenemia on the endometrium during stimulation. However, according to statistics, the high percentage is only about 5%.

Frozen embryos also face a problem, that is, the recovery rate of embryo freezing and re-recovery, that is to say, about 97% of embryos can reach the same level before freezing after freezing and resuming; However, due to the quality of the embryo itself, lysis and degeneration will occur after cryorecovery, resulting in the inability of embryos to be transferred, resulting in a decrease in the probability of pregnancy.

In summary, it is still recommended to have a fresh embryo transfer that can be transferred. Because embryo freezing is also considered, the impact on embryonic epigenetics is currently unknown, and we advocate reducing intervention.

What is the difference between fresh and frozen embryosFresh embryos are fertilized in vitro and then transferred directly into a woman's uterus.

Frozen embryos are embryos that are used after being cultivated by in vitro fertilization and stored at low temperatures for a certain period of time.

If a woman retrieves more eggs during stimulation, there will be a surplus after the transfer of fresh embryos, and the remaining embryos will be frozen. Both are selected embryos that meet the criteria for transfer, except that frozen embryos are a form of fertility preservation.

All are similar, fresh embryos have not undergone the process of freezing, resuscitation, etc., and the activity is high, but the mother may affect the intrauterine environment due to the influence of a series of drugs such as stimulation and egg retrieval, and then affect implantation.

Is the success rate of frozen embryo transfer lower than that of fresh embryo transfer? The doctor said bluntly: these things need to be clarified.

Of course, it's still the same.

Chief Physician of Shanghai First Maternity and Infant Health Hospital - Reproductive Medicine Center - Yang Jianzhi.

In terms of embryos, there is little difference between fresh and frozen embryos. After the embryo is frozen, there is no problem as long as it survives and continues to develop. Even if the embryo is likely to be damaged to varying degrees during the freezing-thawing process, the damaged embryo is not transferred, so in general, the impact on fetal development is not significant.

From the patient's point of view. Because some women will cause a certain degree of temporary endocrine disorder after taking ovulation induction hormones and drugs, resulting in the uterus not being synchronized with the development of embryos, and the probability of failure to transfer fresh embryos is high. If the embryos are cryopreserved and wait until the hormonal and drug reactions have disappeared before the frozen embryos are transferred, the success rate will be higher.

IVF fresh embryo or frozen embryo transfer mainly depends on the patient's physical condition at the time, the success rate of fresh embryo and frozen embryo is about the same, theoretically the success rate of frozen embryo is higher, but it is only higher 5.

Fresh and frozen embryos depend on the patient's condition at the time, for example, when the patient has a cold, fever or other conditions that are not suitable for pregnancy, we will recommend the use of frozen embryo transfer.

It is recommended that patients who do not have contraindications to fresh transplantation should choose fresh embryo transfer, because frozen embryos will face a resuscitation again, and there will be a problem of recovery rate, which will affect the chance of pregnancy.

Most frozen embryos are able to return to the pre-resuscitation level after resuscitation, but a small number of embryos will have problems such as lysis and degeneration after resuscitation, resulting in a reduced chance of pregnancy.

Frozen embryos are the technology of long-term preservation of embryos by ultra-low temperature, and the preservation technology of frozen embryos has become an important part of assisted reproductive technology.

Embryo freezing is the only method in the world that preserves fertility in a mature way. In this technology, the embryos obtained by the IVF culture technology are loaded into the cryovial with the cryocele, and the embryos are kept still by two cooling methods: slow and fast (blastocysts on the 5th and 6th days), and stored in a liquid nitrogen environment of minus 196 for long-term storage.

Embryo freezing is a technique that uses ultra-low temperature to preserve embryos for a long time. The freezing process mainly includes two factors, one is the cryoprotectant, which can protect the embryonic cells during the freezing process and prevent or alleviate cryobia.

Embryo freezing of fertilized eggs for future use.

It is ultra-low temperature quick-frozen embryos. Embryos can also be thawed and re-developed when needed.

Embryo freezing is the only maturation method to preserve fertility. The technique of freezing embryos is:The embryos obtained by IVF culture technology were stored in a liquid nitrogen environment of minus 196 for long-term preservation. If this cycle** fails, these embryos can be thawed and transferred in a later natural cycle.

It is a method of loading embryos and freezing fluid into cryovials, and undergoing slow (embryos on day 2-3) and fast (blastocysts on days 5-6) to make embryos still and stored in liquid nitrogen at 196 degrees. If there are remaining embryos of good quality, they can be cryopreserved and implanted into the uterine cavity after thawing in the natural cycle or artificial cycle, which will increase the chance of conception.