Calculation method of test tube baby's expected date of birth
IVF refers to the process of cultivating embryos in the laboratory through in vitro fertilization technology, and then implanting healthy embryos into the mother's uterus to assist in pregnancy. How to accurately calculate the expected date of IVF is an important issue. In the following, we will elaborate on the calculation method of the expected delivery date of test tube babies from the aspects of menstrual cycle of pregnant women, ultrasonic testing, embryo transfer date and pregnancy week.
Calculation of menstrual cycle
First of all, menstrual cycle is very important for the calculation of the expected delivery date of IVF. By counting the menstrual cycles of pregnant women in recent months, the average number of days in the last three cycles is usually taken for calculation. For example, if the period of the last three months is 28 days, 30 days and 32 days respectively, the calculated average value is 30 days. On this basis, the days of preoperative treatment period are added to determine the ovulation date.
Secondly, ovulation date is an important reference in the calculation of IVF's expected delivery date. Generally speaking, the ovulation day is in the middle of the menstrual cycle, that is, assuming that the menstrual cycle is 30 days, the ovulation day is usually around the 15th day. According to the ovulation date and the survival time of sperm and egg, the fertilization date can be determined.
Finally, according to the date of fertilization and the number of days of pregnancy, the expected date of IVF is calculated. The number of days during pregnancy is generally 280 days, which can also be adjusted according to specific conditions. Through this method, the estimated delivery date of IVF is relatively accurate.
Application of ultrasonic testing
Ultrasonic testing is a common method to predict the expected delivery date of test tube babies. Through ultrasonic imaging technology, the growth and development of the fetus can be observed and measured in detail, so as to calculate the expected date of birth.
First, after the embryo is implanted in the uterus, the formation of the gestational sac can be observed by ultrasonic detection. The appearance of the gestational sac usually occurs 5-6 weeks after fertilization. At this time, the age of the embryo can be determined by measuring the size of the gestational sac, so as to calculate the expected date of delivery.
Secondly, the morphology and organ development of the embryo can be observed through the subsequent ultrasonic detection, and the expected date of delivery can be further calculated. For example, by measuring the fetal head circumference, femur length and other parameters, we can more accurately estimate the fetal age, and then determine the expected date of delivery.
In conclusion, ultrasonic testing plays an important role in the calculation of the expected delivery date of test tube babies, providing reliable reference for doctors and pregnant women.
Confirmation of embryo transfer date
The date of embryo transfer is another important factor that affects the expected delivery date of IVF. The time of embryo transfer sooner or later affects the expected date of delivery.
Generally speaking, embryos can be transferred on the 3rd or 5th day after fertilization. If you choose to transplant on the third day after fertilization, the expected date of delivery will be relatively early; If you choose to transplant on the fifth day, the expected date of delivery will be relatively late. Therefore, the date of embryo transfer needs to be confirmed according to the specific situation in order to accurately calculate the expected date of IVF.
The Importance of Pregnancy Week Measurement
Pregnancy week measurement is also an important method to calculate the expected delivery date of test tube babies. Through the calculation of pregnant women's gestational weeks, the expected date of delivery can be calculated more accurately.
The pregnancy week can be measured in many ways, such as the statement of the pregnant woman, abdominal palpation, and calculation based on the last menstrual time of the pregnant woman. Among them, the calculation based on the last menstrual time of pregnant women is a common and more accurate method.
The time of the last menstruation of pregnant women is an important reference point in the calculation of pregnancy weeks. Through the first day of the last menstrual period, plus the number of days of pregnancy weeks, the expected date of IVF can be calculated.
Summary
To sum up, the estimated delivery date of IVF can be calculated by various methods. The calculation of menstrual cycle, ultrasonic detection, confirmation of embryo transfer date and calculation of pregnancy week can provide accurate information on the expected date of delivery. As for the expected date of birth of test tube babies, doctors and pregnant women can combine various methods to calculate, so as to determine the expected date of birth as accurately as possible and provide reliable time reference for prenatal care and preparation of pregnant women.
