What is the grade of blastocyst 4bb

4BB embryos are high-quality embryos. They are grade one and can be transplanted normally. They refer to embryos that have been cultured for 4 days. Before doing the test tube, the cysts are cultured first, and high-quality embryos are selected and then transplanted into the uterine cavity. The success rate of in vitro fertilization is not only related to the embryo, but also to the suitability of the uterine wall environment for embryo implantation and growth, as well as the overall health and physical condition of the woman.

Only when the relationships in these three aspects are good can a healthy test tube embryo grow. After the IVF is successfully transplanted into the uterine cavity, you must pay attention to adequate rest, increase nutrition, and avoid the stimulation of adverse factors. You can test the hcg gonadotropin level in your blood about 10 days after embryo transfer. If it increases, it will be highly suspected that pregnancy is in the early stages, and you can just have regular follow-up visits afterwards.

Extended expertise on embryos:

Brief description:

Embryo (blastula) refers to the test tube embryo with embryonic fluid and blastocyst cavity formed inside. All the cells in the embryo have not begun to divide. After this stage, the test tube embryo begins to divide.

After cleavage, the sperm and egg are divided into many small cells. This hollow spherical body composed of small cells is called an embryo. After cleavage, the embryonic cells undergo a series of complex movements, resulting in changes in the internal connections of the cell space.

The whole process of creation:

The movement process of embryonic cells varies greatly from organism to organism, but mammals all have one common feature: an opening is formed on the surface of the embryo, called the blastopore, through which cells move into the inner layer of the embryo.

As the morula grows further, the cells begin to divide and gather on one side of the embryo. The larger cells are called the inner cell mass (ICM), which will grow into various tissues of the fetus in the future, while the smaller cells that extend and arrange along the inner cavity of the zona pellucida are called trophoblast cells, which will grow into the embryonic membrane and embryo in the future.

With the further growth and development of the test tube embryo, the embryo with fluid begins to appear inside the test tube embryo - the blastocyst cavity. The test tube embryo at this stage is called an embryo (blastocyst). Further expansion of the embryo will cause the zona pellucida to split, and the test tube embryo will bend and stretch out from it. This process is called hatching.

The test tube embryo grows and develops further from the morula to produce a hollow cell ball. This test tube embryo with an inner cavity is called an embryo.

Embryo transfer:

The embryo is the final stage of in vitro fertilization, which is generally produced 5-7 days after the egg cell is fertilized. Of course, human test tube embryos are embedded in pregnant mothers in the form of embryos, which can achieve a higher test tube embryo embedding rate.

It is at the level of test tube embryos. The quality of these test tube embryos is pretty good. It is better to wait until the tenth day to start testing!

According to experts from the management center, the basic in vitro fertilization method can only be cultivated outside the body for about 48 hours, and it is impossible to cultivate the test tube embryo to the embryonic stage. Its clinical pregnancy rate is only about 20% to 30%. In 1998, American scientists tried to use cell culture media with different nutrients at different stages of the early development of test tube embryos, and cultivated them in sequence. This method can make the test tube embryos be cultivated outside the body for 5 to 6 days, and then transplanted when they reach the embryonic stage, which increases the clinical pregnancy rate to 63%. If the test tube embryos are further cultivated to the 5th to 6th day, they can grow to the embryonic stage. The embryo cultivation often mentioned in the test tube refers to the test tube embryos at this stage. The probability of 5 days and 6 days is the same.