How to calculate the expected date of pregnancy for IVF babies?
In vitro fertilization (IVF) and embryo transfer (ET) in assisted reproductive technology (ART) have become the hope for many infertile couples to achieve fertility. The calculation of the gestational week and the determination of the expected date of delivery of IVF babies have become the focus of many expectant parents. Next, we will introduce the calculation method of IVF's due date in detail from four aspects: ultrasound examination, age of last menstruation, embryo transfer date and influencing factors of IVF's pregnancy circumference.
Ultrasonic examination
Ultrasonography is one of the important means to determine the fetal development. In the calculation of IVF pregnancy weeks, the time of implantation of fertilized eggs can be determined by ultrasonic examination, so as to calculate the expected date of delivery. The first ultrasonic examination is usually carried out two weeks after the transfer of the fertilized eggs to check the embryonic development and determine the implantation time of the fertilized eggs. Then, according to the factors such as the implantation time of the fertilized egg and the size of the fetus, combined with the standard pregnancy week calculation method, the expected date of delivery is calculated.
However, it should be noted that ultrasonic examination is not absolutely accurate, and it is normal for errors to occur within a few days or so. Therefore, ultrasound is only an auxiliary means to calculate the expected delivery date of test tube babies, and other factors need to be comprehensively considered in the subsequent calculation of pregnancy weeks.
Last menstrual age
In the absence of an accurate implantation time, another calculation method for the expected delivery date of IVF is to calculate it according to the age of the last menstruation. By recording the start date and cycle of the last menstruation, combined with the change rule of the menstrual cycle, we can roughly estimate the time of ovulation and pregnancy.
However, it should be noted that for IVF, the calculation method of the final menstrual age is not accurate. Because IVF is achieved through in vitro fertilization and embryo transfer, it is different from the cycle of natural pregnancy. Therefore, the final menstruation age can only provide a rough range of expected dates, and further calculation needs to be carried out in combination with other indicators.
Embryo transfer date
The date of embryo transfer is an important reference for the calculation of the expected delivery date of IVF. Generally, 14 days after embryo transfer, i.e. D14 in pregnancy week calculation, is the expected date of IVF. This is because 14 days after embryo transfer is the time point for calculation after implantation of the fertilized egg.
However, it should be noted that the embryo transfer date can only provide a preliminary range of expected dates, with certain errors. The actual expected production date needs to be calculated in combination with other factors.
Influencing factors of pregnancy circumference of test tube infants
The calculation of IVF pregnancy circumference is also affected by some factors, such as women's age, physique and ovarian response. Older women may need a longer time to successfully conceive during IVF, so the expected date of delivery will be postponed accordingly. In addition, women's physical condition and ovarian response may also affect the pregnancy cycle of IVF.
To sum up, the calculation method of IVF's due date can be comprehensively considered from multiple aspects such as ultrasound examination, age of last menstruation, embryo transfer date and pregnancy circumference. Ultrasonography can provide the time of implantation of fertilized eggs, the last menstrual age can provide a rough range of the expected date of birth, the date of embryo transfer is a preliminary reference standard, and the influencing factors of pregnancy circumference can further adjust the expected date of birth. Only by comprehensively considering the above factors can we accurately calculate the expected delivery date of IVF.
