How long can IVF determine embryo type
IVF is a kind of assisted reproductive technology, which artificially transfers the fertilized eggs into the mother's uterus to help couples who are difficult to conceive naturally realize their fertility aspirations. In the process of IVF, determining the type of embryo is a crucial step. This article will discuss how long IVF can determine the type of embryo, and related medical methods and technologies from a scientific perspective.
1. Time of embryo growth and development
The time of embryo growth and development is one of the important factors to determine the type of embryo. The growth time of fertilized eggs in vitro culture medium is usually 5-6 days. During this period, the embryo will go through multiple cell division stages, developing from a single cell to a blastocyst. According to the time of blastocyst formation, the type of embryo can be preliminarily determined.
In modern assisted reproduction technology, embryo types are mainly divided into the following categories: single embryo, twin embryo, triple embryo and blastocyst. Single embryo means that the fertilized egg only experienced one cell division on the first day in the culture medium, twin embryo has two cells on the second day, triple embryo has three cells on the third day, and blastocyst is the cystic structure formed on the fifth to sixth days. Doctors can further screen and select embryos according to the types of embryos.
According to the development time of embryo type, the type of embryo can be determined after 6 days of fertilized egg culture.
2. Preliminary embryo detection method
Preliminary embryo testing is a method used to identify the quality of embryos. Usually on the third day of embryo culture, the doctor will conduct a preliminary embryo test. This detection method mainly judges the health and development of embryos by observing the number, shape and symmetry of embryonic cells.
The commonly used preliminary embryo detection methods include quality assessment, endoplasmic reticulum assessment and cell division assessment. The doctor will preliminarily determine the type of embryo based on these evaluation results, and select the most promising embryo for further culture and transplantation.
Preliminary embryo testing is usually completed on the third day of IVF, which helps to screen healthy embryos.
3. Detailed embryonic genetic testing
In order to determine the type of embryo more accurately, detailed embryonic genetic testing is also needed. This test method can help doctors detect chromosomal abnormalities of fertilized eggs and risk of genetic diseases.
Common detailed embryonic genetic testing methods include pair matching analysis (PGD) and next-generation sequencing technology. Pairing analysis is a screening method based on genetics, which can detect whether the zygote carries mutations of genetic diseases. The new generation sequencing technology can conduct high-throughput sequencing on the chromosomes of the fertilized eggs, helping doctors to determine whether there are chromosomal abnormalities in the fertilized eggs.
Detailed embryonic genetic testing usually needs to be completed on the fifth to sixth days of embryo culture, so that doctors can more accurately select healthy embryos for transplantation.
4. IVF transplantation and result determination
Once the type of embryo is determined, and after detailed embryonic genetic testing, doctors will select the healthiest embryo for transplantation. Transplantation is usually carried out on the fifth to sixth days of embryo culture, and there may be some individual differences depending on the specific situation.
After transplantation, the doctor will regularly observe the growth of the implanted baby in the uterus and make relevant pregnancy judgments. Generally, within 10-14 days after transplantation, HCG (human chorionic gonadotropin) test in blood or urine can be performed to confirm pregnancy.
By judging the pregnancy after IVF transplantation, couples can get the information about whether the pregnancy is successful or not, and on this basis, continue to carry out relevant pregnancy tracking and nursing.
Summary
How long an IVF can determine the type of embryo is a question that varies from person to person. Generally, it needs to go through several stages, including embryonic growth and development time, preliminary embryo testing, detailed embryonic genetic testing, IVF transplantation, and result determination.
Through the above scientific methods and technologies, doctors can more accurately determine the types of embryos, screen healthy embryos, and improve the success rate of IVF. However, each person's situation is different, and the specific embryo type determination time needs to be determined according to the individual situation and the doctor's recommendations.
