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Tan Xiaojun
·Senior reproductive medicine expert
·Postdoctoral fellow at Peking University
·PhD candidate at Xiangya School of Medicine, Central South University
·Master’s tutor at Central South University
· Master's degree candidate in reproductive medicine at the University of South China
· Professional training at Huazhong University of Science and Technology and Tongji Hospital Reproductive Center
Expertise:
diagnosis and treatment of infertility, first/second/third generation IVF (including
          egg/sperm donation), microsperm retrieval, embryo freezing and resuscitation, artificial
          insemination (including husband's sperm and sperm donation), paternity testing, chromosomal
          disease
          diagnosis, high-throughput gene sequencing, endometrial receptivity gene testing and other
          clinical
          technology applications. Many of these technologies are at the leading level both domestically
          and
          internationally.
Date:
2026.02.03
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Detailed explanation of the causes and processes of embryo transfer

Embryo transfer is not as complicated as you think

Many people's first reaction when they hear about "embryo transfer" is:


Can such an important thing still be moved around?

Will it break at the slightest movement?

It sounds very dangerous


But from the perspective of healthcare professionals:

In the field of in vitro fertilization, embryo transfer has long been a common and mature practice.


Below, I will analyze the specific situation of embryo transfer in a way that is easy for the public to understand!


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Let's clarify in one sentence:

Embryo transfer refers to the safe transportation of frozen embryos from one hospital to another.

Do not thaw, do not come into contact with air, and do not 'tinker with embryos'.


It's more like 'moving as a whole in a frozen state',


The embryo has been frozen and stored in a liquid nitrogen environment at -196 ℃ before transportation


The cell pause button is pressed, which neither grows nor ages.


So the key concern is not whether to move or not, but whether the temperature is stable or not.


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How did it operate?

It's not a courier, nor is it just casually carried away.


Regular embryo transfer must use:


Professional liquid nitrogen transport tank


Full process ultra-low temperature


L can maintain stability for more than 7-10 days


Throughout the entire process:


Embryo not thawed


I can't see the light


Not in contact with the external environment


You can understand it as:

The embryo sleeps from beginning to end.


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Why do people need to transfer embryos?

There are several common situations


The egg retrieval is at Hospital A, and I want to go to Hospital B for transplantation


Retrieve eggs from abroad, return to China or transfer to another country for transplantation


The original hospital no longer performs transplants, or the doctor suggests changing the location


Due to time, visa, and policy reasons, it is not possible to continue in place


Simply put, when a person changes places, the embryo has to follow along.


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Will transportation affect the success rate? This is what everyone is most concerned about.

The conclusion is that standardized transportation ≠ reduces the success rate.


What doctors are really worried about is: repeated thawing and non professional operations


Instead of moving from one city or country to another.


Where exactly is the risk?

In fact, the main focus of risk lies in the "human" rather than the "embryo".


The main risks are concentrated in:


Inadequate information verification (name, number)


Non professional organization operation


Non compliant documents and processes


So what really matters is:

Who will transfer, how to transfer, and if the process is not standardized.


Ordinary people only need to remember these three sentences

Embryo transport ≠ thawing

Temperature stability is more important than 'not moving'

Professional process, security is controllable


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Finally, I would like to advise everyone:

If you have already reached the stage of test tube,

Embryo transfer is not a ferocious beast,

It is just a tool in the reproductive pathway.


Afraid of it, it's better to see the process clearly, choose the right person, and ask for details.


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For fertility consultation in Kyrgyzstan, please contact your dedicated consultant

/Fertility Consultation /

Dr.Chan


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