How to calculate the expected date of IVF?
In vitro fertilization (IVF) refers to the process in which the fertilized eggs are cultivated into embryos and implanted into the mother's body through in vitro fertilization (IVF) technology, so as to achieve pregnancy and delivery. For test tube babies, the calculation of the expected date of birth is slightly different from that of natural pregnancy. In the following, we will elaborate on how to calculate the expected date of delivery for IVF from multiple aspects.
1. Determination of chemical conception date and fertilization date
The estimated date of IVF is calculated based on the chemical conception date and the fertilization date. The chemical conception date refers to the day when the embryo is transferred or cryopreserved after IVF and implanted into the mother. The fertilization date refers to the date when the fertilized egg combines with the sperm to form a fertilized egg. In the process of IVF treatment, doctors will determine the fertilization date according to the combination time of eggs and sperm and the condition of embryo cultivation.
Within two weeks after IVF treatment, women will have their blood or urine tested for hCG (human chorionic gonadotropin) to determine the chemical conception date. This hormone will start to release after the fertilized embryo is implanted into the uterus, even before the pregnant woman has obvious pregnancy symptoms. Therefore, the chemical conception date is the starting point for the calculation of the expected delivery date.
2. Calculation method of gestational age
The pregnancy week of IVF is calculated in a similar way to that of natural pregnancy, using the concept of pregnancy week and duration. Generally, the pregnancy period is divided into three stages, namely, the early stage, the middle stage and the late stage.
After the chemical conception date is determined, the doctor will take this date as the starting point of pregnancy and calculate the gestational week. Every week, pregnant women will enter the next pregnancy week. For example, one week after the chemical conception day, the pregnant woman enters the second pregnancy week. In this way, the current pregnant weeks of pregnant women can be calculated.
3. Importance of B-ultrasonic inspection
In the calculation of the expected date of delivery of test tube babies, B-ultrasound examination is very important. Through B-ultrasound examination, doctors can determine the fetal development, including fetal size, fetal heart rate and placental condition. Based on these data, doctors can calculate the expected date of delivery more accurately.
Under normal circumstances, the calculation of the expected date of physical pregnancy is mainly based on the first day of the last menstrual period, while the calculation of the expected date of IVF is based on the chemical conception date. After the embryo transfer, the doctor will conduct regular B ultrasound examination to monitor the development of the embryo. According to the results of B-ultrasound examination, doctors can correct the gestational age to predict the expected date of delivery more accurately.
4. Calculation method of hospital's expected delivery date
Each hospital may have different methods and standards for the calculation of the expected delivery date of IVF. Some hospitals may still use the calculation method of natural pregnancy due date, taking the first day of the last menstruation as the benchmark, and then modify it according to the development of the embryo.
However, some hospitals specializing in IVF treatment may pay more attention to the results of chemical pregnancy date and B-ultrasound examination, so as to calculate the expected date of delivery more accurately. These hospitals may carry out personalized calculation of the expected date of delivery according to the results of B ultrasound examination on the day of chemical conception and after embryo transfer, combined with the specific conditions of pregnant women.
summary
The calculation of the expected date of delivery of IVF is slightly different from that of natural pregnancy. The determination of chemical conception date and fertilization date is the basis for calculating the expected date of delivery. Through the calculation of gestational weeks and the assistance of B-ultrasound examination, doctors can more accurately predict the expected date of delivery of IVF. Different hospitals may adopt different calculation methods, so pregnant women need to communicate with doctors in detail before surgery to understand the specific calculation method of the expected delivery date in their hospital.
