How to calculate the expected birth date of IVF?
In vitro fertilization (IVF) refers to the combination of sperm and egg to form a fertilized egg, and then transfer the fertilized egg back to the mother's uterus for development. The doctor will calculate the expected birth date of IVF according to multiple factors, including the development speed of the fertilized egg, the date of embryo transfer, etc. The following four aspects will be described in detail: embryo development, embryo transfer date, pregnancy calculation and the actual situation of the hospital.
Effects of embryonic development
The development rate of fertilized eggs has an important influence on the expected birth date of IVF. Generally speaking, on the second day after fertilization, the fertilized egg will enter the two cell stage, on the third day it will enter the six cell stage, and on the fourth day it will form a full blastocyst. If the embryo blastocyst stage is reached on the fifth day, doctors are more inclined to select the embryo for transplantation, because the blastocyst has a higher implantation rate. According to the development of the embryo, the doctor will make a preliminary calculation of the expected birth date of the IVF.
However, embryonic development is a complex process, and the development speed of each embryo may be different. Therefore, when calculating the expected birth date of IVF, doctors will further adjust the calculation results by taking into account the development of embryos and the special conditions of the patient's mother.
Importance of embryo transfer date
The date of IVF embryo transfer also has an important influence on the calculation of expected birth date. Embryos usually need a period of time to complete implantation after transfer, and implantation is the beginning of a pregnant woman's real pregnancy. According to the doctor's advice and the specific situation of the mother, the date of embryo transfer can be selected between 2-6 days after fertilization.
For example, if an embryo is transferred the day after fertilization, the time of implantation may be later, and the corresponding expected date of birth may be postponed. If the embryo is transferred on the fifth day after fertilization, because the embryo has reached the blastocyst stage, the implantation time may be earlier, and the expected birth date may be earlier. Therefore, the selection of embryo transfer date is very important when determining the expected birth date of IVF.
Method of pregnancy calculation
Pregnancy calculation is the basis for the estimated birth date of IVF. Generally speaking, the first day of the last menstruation is the starting date of pregnancy for pregnant women. However, for IVF infants, the date of the last menstrual period is not applicable to pregnancy calculation, because IVF fertilization is conducted in vitro.
For test tube babies, doctors will adjust the pregnancy calculation by embryo development and transfer date. According to the number of days after embryo transfer, the doctor will calculate the pregnancy period gradually from the day of transfer until the expected date of birth. This method of pregnancy calculation can more accurately determine the expected date of birth of test tube babies.
Actual situation of the hospital
The actual situation of the hospital will also have an impact on the calculation of the expected birth date of IVF babies. Different hospitals may adopt different calculation methods and standards to estimate the expected birth date of IVF. Some hospitals may carry out statistical analysis based on clinical experience and a large amount of data, and formulate calculation standards applicable to patients in their hospitals, which can better predict the birth date of test tube babies.
Therefore, the actual situation of the hospital should also be considered when determining the expected birth date of IVF. Patients can consult their doctors about the calculation methods and standards to better understand the calculation basis of the expected date of birth.
Summary
The calculation of the expected birth date of IVF is a process of comprehensive consideration of various factors. The development of embryos and the date of embryo transfer are important influencing factors. The expected date of birth is determined by accurately calculating the pregnancy period. At the same time, the actual situation of the hospital will also affect the calculation of the expected date of birth. When consulting the doctor, patients can understand the specific calculation methods and standards, so as to better understand the expected birth date of IVF.
