How to calculate the pregnancy weeks of IVF babies accurately?
IVF is to complete the process of fertilization in vitro through assisted reproductive technology, and then transfer the embryo to the mother's womb for development. In the process of IVF, the calculation of pregnancy week is very important for doctors and prospective parents. It can help to determine the development status of embryos and predict the delivery date. So, how to calculate the pregnancy weeks of IVF babies accurately? This article will elaborate on ultrasound examination, fetal growth parameters, egg development and the time of artificial insemination.
Ultrasonic examination
Ultrasonography is one of the most common and accurate methods to calculate the gestational age of test tube infants. About 14 days after IVF transplantation, the doctor will perform the first ultrasound examination. At this time, the survival of the embryo can be determined by observing the heartbeat of the embryo in the uterus, and marks the beginning of the pregnancy week. Next, the doctor will arrange regular ultrasound examination to record the growth and development of the embryo. By observing the size, shape, organ development and other parameters of the embryo, doctors can get an accurate gestational week. In addition, ultrasound can also help detect whether the embryo has genetic defects and take necessary intervention measures in time.
When calculating the gestational week, doctors usually use the change of progesterone level and the size of the uterus to assist in judgment. The progesterone level is mainly determined by blood sampling. The increase of progesterone level can indicate the growth of the fetus. At the same time, the size and shape of the uterus can also reflect the changes in the gestational week, and doctors will combine these comprehensive information to calculate the gestational week.
Fetal growth parameters
In addition to ultrasound, fetal growth parameters are also an important basis for calculating the gestational age of test tube infants. During the ultrasonic examination, the doctor will measure the fetal head circumference, abdominal circumference, femur length and other parameters, which can reflect the growth of the fetus. According to the growth curve of the fetus and the growth law of the normal fetus, the doctor can calculate the gestational week of the fetus. This method can obtain the accurate gestational age while ultrasound examination, and improve the accuracy of calculation.
The measurement of fetal growth parameters can help doctors understand the overall development of the fetus and judge whether it is consistent with the gestational age. If the growth parameters of the fetus deviate significantly from the normal range, it may indicate abnormal fetal development, and further inspection and intervention are needed.
Egg development
The development of eggs also has a certain impact on the calculation of gestational weeks. During IVF assisted reproduction, doctors usually monitor the development of eggs to determine the best time for insemination. The development of eggs can be judged by means of ultrasonic examination, blood hormone level monitoring, etc. Normally, the egg development process takes about 14 days, and the pregnancy week of IVF is calculated from the egg development.
The development of eggs has little influence on the calculation of gestational week, because the gestational week of IVF is usually calculated from embryo transfer. However, the development of eggs will still affect the quality and development of embryos, which will have a certain impact on the pregnancy week and delivery results.
Time of artificial insemination
The gestational week of IVF is also closely related to the time of artificial insemination. During IVF assisted reproduction, doctors will determine the time of artificial insemination according to women's menstrual cycle. Generally speaking, the first day of menstruation is regarded as the beginning of a new cycle. Doctors calculate the time when women ovulate, and conduct egg collection and sperm insemination before that. The gestational weeks of IVF babies are calculated from the time of artificial insemination.
The time of artificial insemination has a direct impact on the calculation of gestational weeks. If the time of artificial insemination is not determined accurately, the calculation of gestational week will also have errors. Therefore, in the process of IVF assisted reproduction, doctors need to accurately determine the time of artificial insemination according to the menstrual cycle and ovulation of women, so as to ensure the accuracy of the calculation of pregnancy weeks.
Summary
The calculation of IVF pregnancy week is based on the comprehensive consideration of ultrasound examination, fetal growth parameters, egg development and the time of artificial insemination. Ultrasonography is the most common and accurate method to calculate the gestational age. The accurate gestational age can be obtained by observing the development of embryos. The growth parameters of the fetus can also assist in judging the gestational week, while the development of eggs and the time of artificial insemination have certain effects on the calculation of the gestational week. To sum up, it is very important for doctors and prospective parents to accurately calculate the gestational age of IVF babies, and multiple factors need to be considered comprehensively to ensure the healthy development and successful delivery of IVF babies.
