Cryopreservation of eggs and embryos: What are the specific differences? Dr. Nathan Zhang from IVF USA discusses IVF in the United States and Thailand.

2024-02-22 18:47:31，浏览量： 43次

 

According to recent statistics, the number of infertile individuals in China has reached approximately 50 million. In order to fulfill the dream of parenthood, some women opt for egg or embryo cryopreservation in the United States. However, many women are unclear about the differences between these two options when deciding between egg and embryo freezing. This article will delve into the distinctions between egg and embryo cryopreservation in the United States to help you better understand and make informed choices.

 

Firstly, let's focus on the importance of reproductive age. The chances of natural conception and childbirth for women over 40 are less than 5%. As women age, ovarian function declines, leading to decreased egg quality and quantity, significantly reducing the success rate of conception. Older women face challenges in natural conception and often require assisted reproductive techniques.

 

The primary difference between egg and embryo cryopreservation lies in the form of cryopreservation. Eggs are frozen as single cells, while embryos are frozen at an early stage and can be directly thawed for implantation. Additionally, eggs cannot be screened for genetic abnormalities before freezing, whereas embryos undergo screening using the third-generation IVF-PGT (preimplantation genetic testing) technology in the United States, allowing for the detection of chromosomal abnormalities and improving success rates.

 

In summary, egg freezing does not allow for the assessment of egg quality. While egg quality is relatively good in younger women, it becomes increasingly uncertain for women over 40. Therefore, IVF USA recommends that older women with diminished ovarian function opt for direct embryo cryopreservation. With third-generation IVF-PGT, fertilized eggs are cultured to the blastocyst stage on the fifth day, undergo genetic screening, and abnormal embryos are discarded, ensuring the highest quality of frozen embryos with success rates of up to 60%-70%.

 

Egg freezing in the United States utilizes ultra-rapid freezing technology, known as vitrification, to prevent ice crystal formation and cell damage during the freezing process. Frozen eggs are in a vitrified solid state and can be stored for up to 10 to 50 years, with only a 10% difference compared to fresh eggs. Cryopreserved embryos, stored in liquid nitrogen at -196°C, can be preserved for an extended period and significantly increase the chances of conception when thawed and implanted in the future.

Understanding these differences can help women make more informed choices about their reproductive options. IVF USA is committed to providing professional reproductive counseling services to those in need. Dr. Nathan Zhang, as the founder of IVF USA, possesses extensive expertise and experience, dedicated to providing high-quality medical services to every patient. IVF USA currently offers services including egg freezing and IVF in the United States, Japan, Thailand, Mexico, Taiwan, Hong Kong, and other regions, collaborating closely with top IVF specialists worldwide. For inquiries regarding overseas IVF, feel free to consult our expert team.