Calculation of the expected date of birth of test tube babies
IVF is an increasingly popular assisted reproductive technology in recent years. Many couples have realized their parent-child dreams through IVF technology. For test tube babies, it is very important to calculate the expected delivery date accurately. This article will elaborate on the calculation of the expected delivery date of IVF from four aspects: pregnancy week calculation, ultrasound examination, embryo transfer date and blastocyst development degree.
Pregnancy Week Calculation
The first step of IVF baby's due date is to calculate the gestational week. The pregnancy week is calculated by adding 7 days to one week from the first day of the last menstrual period. Generally speaking, the time of last menstruation is the easiest to determine, and then combined with the length of female menstrual cycle and the prediction of ovulation day, the expected date of pregnancy can be calculated more accurately.
However, for test tube babies, because the time of embryo transfer and the time of sperm egg combination may be different from natural pregnancy, it is not accurate to calculate the pregnancy week only by the time of the last menstrual period. Therefore, it is necessary to combine other medical means to calculate the expected date of delivery more accurately.
Ultrasonic examination
Ultrasonography is a method commonly used to measure fetal development and predict the expected date of delivery. Through the ultrasonic imaging system, doctors can observe the size of the fetus, the development of organs and blood flow, so as to calculate the expected date of delivery.
In the process of IVF, doctors will observe the development of the embryo through regular ultrasonic examination. Generally speaking, the first ultrasound examination can be carried out within two weeks after IVF transplantation, and whether embryo implantation occurs can be observed at this time. The next several ultrasound examinations can observe the development speed and body size of the embryo, and calculate the expected date of birth by calculating the CRL (head and hip length) of the embryo.
Date of embryo transfer
The estimated date of IVF can also be determined by the date of embryo transfer. The date of embryo transfer is the specific date when the fertilized egg is implanted into the uterus after the sperm and egg are combined. Generally speaking, 14 days after embryo transfer is two weeks, which is regarded as the starting point of the expected delivery period.
On the basis of embryo transfer date, combined with pregnancy week calculation and ultrasound examination, the expected date of delivery can be further determined. This is because embryos generally go through a specific development stage in the time after transfer, and doctors can judge the pregnant woman's due date by observing the development of embryos.
Development degree of blastocyst
The expected date of IVF can also be estimated by the development of blastocysts. The blastocyst is developed from the embryo, which contains the stem cells in the embryo. On the fifth day after embryo transfer, the blastocyst will further develop into an embryo with a broader index range.
By observing the development of blastocysts, doctors can estimate the expected date of delivery of pregnant women. This is because the development degree of the blastocyst is related to the development speed of the embryo. Generally speaking, the better the blastocyst develops, the faster the embryo develops, and the earlier the corresponding due date is.
Summary
To sum up, the expected date of IVF can be calculated by various methods such as gestational week calculation, ultrasound examination, embryo transfer date and blastocyst development degree. These methods can provide doctors with more accurate information about the expected date of delivery, and help pregnant women and families prepare for new life.
However, it should be noted that everyone's physiological conditions and embryonic development are different, so the calculation of the expected date of birth is only an estimate, and the actual date of birth may be biased. During the whole IVF process, close communication with doctors and regular inspection are very important to ensure the health of mothers and babies.
