How to calculate the expected date of pregnancy test tube baby?
Test tube baby technology is an important assisted reproductive technology in modern medicine. For couples who cannot conceive naturally, it is an important way to realize their reproductive dreams. So, how to calculate the expected date of delivery after pregnancy of test tube baby? The following four aspects are described in detail from the last menstrual period, embryo implantation date, fetal growth and ultrasonic examination.
1. Last menstrual period
The last menstrual period is the basis for the calculation of the expected delivery period of pregnant test tube babies. Generally speaking, the expected date of delivery is calculated according to the first day of the last menstrual period. Women ovulate about two weeks after menstruation every month. If they are fertilized and successfully embedded in the uterine wall during this period, they can become pregnant. Therefore, the last menstrual period is generally considered as the starting time of fertilization. Generally speaking, pregnant women usually have their first amenorrhea 14 days after pregnancy, which is the starting point of the pregnancy cycle.
The calculation method of the expected date of birth is to add 280 days to the first day of the last menstrual period to obtain the expected date of birth. However, it should be noted that this is only a rough forecast, and the specific situation needs to be adjusted according to different factors.
2. Date of embryo implantation
Test tube babies are usually implanted into the mother's uterus after 5 days of embryo culture. Therefore, if the date of embryo implantation is clear, the expected date of delivery can be calculated according to this date.
Generally speaking, 14 days after the embryo implantation date is the predicted pregnancy date. According to the date of conception, plus 280 days, you can get the expected date of birth. This calculation method is more accurate because it is calculated directly according to the date of embryo implantation and does not involve the whole last menstrual cycle.
3. Fetal growth
The growth and development of the fetus is one of the important bases for calculating the expected date of delivery. Doctors can more accurately predict the expected date of delivery by measuring the size and development of the fetus.
In general, fetal growth is determined by multiple ultrasound examinations during pregnancy. The doctor will measure the fetal head circumference, abdominal circumference, femur length and other indicators, and compare these data with the standard development curve to determine the fetal development and expected date of delivery.
It should be noted that the growth of the fetus may be different due to individual differences or other factors, so when calculating the expected date of delivery, it is also necessary to make a comprehensive judgment in combination with other factors.
4. Ultrasonic inspection
Ultrasonic examination is one of the most commonly used examination methods during pregnancy, and is also one of the important basis for determining the expected date of delivery. Through ultrasonic examination, doctors can observe the development and maturity of the fetus, and calculate the expected date of delivery according to these data.
Ultrasonic examination is usually carried out on a regular basis. The doctor will measure the size, weight, head circumference and other indicators of the fetus, and observe the organ development of the fetus. Based on these data, combined with the growth curve of the fetus and other factors, doctors can give a more accurate expected date of birth.
Summary:
The expected date of pregnancy of test tube baby can be calculated by many methods. The last menstrual period is one of the most commonly used methods, which is predicted according to the first day of the last menstrual period plus 280 days. If you know the date of embryo implantation, you can calculate the expected date of delivery directly according to this date. The growth and development of the fetus and ultrasonic examination are also important basis for determining the expected date of delivery. Taking these factors into account, we can get a more accurate expected date.
In conclusion, for couples who are undergoing IVF technology, it is very important to calculate the expected date of birth for reasonable arrangement of daily life and good health care during pregnancy. By accurately calculating the expected date of delivery, pregnant women and families can have more accurate expectations and better meet the arrival of the baby.
