How to calculate the expected date of IVF?
IVF refers to the process of completing fertilization and embryo culture in vitro through artificial assisted reproduction technology, and then implanting the embryo into the mother's uterus. The expected date of birth refers to the date when the fetus is born after about 40 weeks of development in the mother. However, due to the fact that IVF and embryo implantation are carried out in the laboratory, the calculation method of the expected delivery date is different from that of natural pregnancy. The following will elaborate the calculation method of the expected delivery date of IVF from four aspects.
Determination of fertilization date
In natural pregnancy, fertilization is usually completed within 24 to 48 hours after ovulation. In the process of IVF operation, doctors will predict the best time for fertilization according to women's menstrual cycle and ovulation. Fertilization is usually carried out within 24 to 48 hours after egg retrieval, which means that the fertilization date of IVF can be determined as the date of egg retrieval plus 1 to 2 days.
In addition, some IVF babies are fertilized through ICSI (single sperm injection) technology. In this case, the fertilization date can be precisely determined, because the doctor will inject sperm into the egg on the same day after taking the egg.
Embryonic development considerations
IVF embryos are cultured in the laboratory for a period of time before being implanted into the mother's uterus. According to the development of embryos and the number of days of culture, the time of embryo culture should also be considered in the calculation of the expected date of birth. Generally speaking, embryos are implanted into the uterus after 5-6 days of culture in the incubator, which means that the expected date of delivery needs to be postponed by 5-6 days accordingly.
The Importance of Ultrasonic Examination
Ultrasonography is the most direct and accurate method to determine the expected delivery date of test tube babies. In two weeks after embryo implantation, early ultrasound examination can be carried out to determine whether the implantation is successful and the development of the embryo. In the later pregnancy, the growth and development of the fetus can be monitored by regular ultrasound examination. Through ultrasound, doctors can correct the expected date of delivery if the fetal development does not match the expected date of delivery.
Summary
The calculation of the expected date of IVF needs to consider the date of egg retrieval, the time of embryonic development and the results of ultrasound examination. The date of fertilization can be determined by the date of egg taking plus 1 to 2 days. The time of embryo development needs to be postponed according to the number of days of embryo culture. Ultrasonography is the most direct and accurate method to determine the due date, which can be adjusted according to the development of the embryo and the growth of the fetus. Therefore, when calculating the expected date of delivery of IVF, it is recommended to conduct detailed examination and evaluation under the guidance of doctors. Only in this way can we determine the expected date of IVF more accurately and provide strong support for the management of the whole pregnancy period.
