What is the gestational age of IVF?
In vitro fertilization (IVF) is a therapeutic method that uses assisted reproductive technology to fertilize in vitro and then transfer the fertilized eggs to the mother's uterus. How long is the pregnancy age of IVF? The following four aspects are described in detail: embryo development, transfer opportunity, pregnancy calculation and factors affecting pregnancy age.
embryonic development
In IVF technology, the embryo culture cycle is generally 3-6 days. The length of the culture cycle determines the development of the fertilized egg. Generally speaking, the fertilized eggs are called two cell embryos after 1-2 days in vitro culture, 8-cell embryos after 3-4 days, and blastocysts after 5-6 days. According to the development of the embryo, the doctor will choose the best time to transfer the embryo to the mother's uterus.
Embryo development is not only related to the time of transfer, but also related to the quality of embryos. The fertilized eggs with good embryo quality develop faster, and are generally transferred in the early development stage, while the fertilized eggs with poor embryo quality develop slower, so they need to be transferred in the later development stage.
Transplantation opportunity
Choosing the right time for transplantation is one of the important factors for the success of IVF. The time of transplantation is generally determined according to the patient's personal conditions and embryonic development. Generally, the time of transfer is the 3-6th day of embryo culture.
The success rate of IVF can be improved by transplanting embryos at the blastocyst stage. Because at this stage of blastocyst development, the cells inside the embryo will differentiate into inner cell clusters and outer cell clusters. The inner cell clusters form the embryo, and the outer cell clusters form the blastoderm, making the embryo more capable of implantation in the uterus.
When choosing the time of transplantation, doctors will also consider the patient's physical condition, hormone level, uterine cavity environment and other factors to ensure the success of transplantation.
Pregnancy calculation
The pregnancy period of test tube baby is calculated in the same way as that of natural pregnancy. The pregnancy period starts from the first day of the last menstruation and ends at 40 weeks (280 days) of pregnancy. The pregnancy period can also be calculated by checking the size and development of the fetus with B-ultrasound.
It should be noted that the pregnancy period of IVF is 5-6 days shorter than that of natural pregnancy because IVF technology usually transfers embryos to the mother's uterus 5-6 days after pregnancy.
Factors affecting gestational age
The gestational age of IVF is affected by many factors.
The first is female age. Female age is one of the key factors in the success rate of IVF. The older the woman, the lower the success rate of IVF. Generally speaking, the success rate of women under 35 years old is higher, and the success rate of women over 35 years old will gradually decrease.
The second is the patient's physical condition and physiological conditions. For example, abnormal uterine morphology and immune function may affect the success rate of IVF.
In addition, the success of IVF is also related to the technical level and equipment conditions of medical institutions. Some top medical institutions have a high success rate in the field of IVF, while some institutions with lower technical level may have a low success rate.
To sum up, the pregnancy age of IVF is generally determined according to the development of embryos and the time of transfer. The calculation method of pregnancy period is the same as that of natural pregnancy. The success rate of IVF will be affected by women's age, physical condition and technical level of medical institutions.
