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What are the rules for estimating the expected birth date of test tube babies?

What are the rules for estimating the expected birth date of test tube babies?



Rules for Estimating the Expected Delivery Date of IVF

The estimation of the expected date of birth of test tube babies refers to the assessment of the development of test tube babies by medical methods and the determination of the expected date of birth according to the assessment results. The following four aspects are described in detail: pregnancy week calculation, embryo culture duration, embryo implantation period and intrauterine pregnancy week monitoring.

1. Calculation of gestational week

The calculation of gestational weeks is the first step in estimating the expected delivery date of IVF infants. It is calculated according to the first day of the pregnant woman's last menstruation and the date of IVF embryo transfer. Generally, blood progesterone is measured on the 14th day after the transfer of fertilized eggs, and the success of pregnancy is judged by the increase of progesterone value and the decrease of male hormone. If the fertilized egg is successfully implanted, the pregnancy week can be considered as 5 weeks. Subsequently, the size and development of the embryo were measured by ultrasonic examination to further determine the gestational age. Generally speaking, after the embryo has a heartbeat, the gestational week can be calculated according to the fetal heart rate and fetal size. The accuracy of pregnancy week calculation is very important for the estimation of the expected delivery date of IVF. Therefore, when calculating the gestational age, clinicians need to make comprehensive judgments based on multiple data to ensure the accuracy of the results.

2. Duration of embryo culture

The length of embryo culture is also one of the important factors affecting the estimation of the expected date of delivery. The embryo culture of IVF is usually divided into three stages, namely the fertilization stage on the first day, the four cell stage on the second day and the eight cell stage on the third day. The duration of embryo culture mainly depends on the condition of embryo development. Generally, embryos need to be cultured to at least eight cell stage before transplantation. If the embryo can continue to be cultured to the blastocyst stage, the success rate of transfer will be higher. It should be noted that the duration of embryo culture has no direct impact on the expected delivery date of IVF, but it will affect the timing and success rate of transplantation, and thus affect the estimation of the expected delivery date.

3. Embryo implantation period

The period of embryo implantation is also one of the important factors in the estimation of the expected date of delivery. The selection of embryo transfer period is carried out according to different situations, and there are usually two ways: fresh embryo transfer and frozen embryo transfer. Fresh embryo transfer refers to the direct transfer of well developed embryos after fertilization into the mother's uterus. The advantage of this method is that the embryonic development is more in line with the natural law, but it is also vulnerable to the influence of ovarian stimulation drugs. Frozen embryo transfer refers to cryopreservation of blastocysts or embryos for more than three days, and then transfer when the intrauterine environment is good. This method can improve the success rate of transplantation, but requires additional time to prepare the intrauterine environment. The selection of embryo implantation period has a certain impact on the estimation of expected delivery date. If frozen embryo transfer is selected, the due date may be postponed accordingly.

4. Intrauterine pregnancy week monitoring

Intrauterine gestational week monitoring refers to monitoring the gestational week by regularly checking the fetal heart rate, fetal size and the physical reaction of the pregnant woman during the pregnancy period after IVF transplantation. By monitoring intrauterine pregnancy weeks, we can more accurately understand the development of embryos and the expected date of delivery. If the pregnant woman's gestational week is found to be significantly different from the expected one, the clinician can take further measures, such as ultrasonic examination or infant maturity score, to further determine the expected date of delivery. To sum up, the estimation of the expected delivery date of IVF requires comprehensive consideration of pregnancy week calculation, embryo culture duration, embryo implantation period, intrauterine pregnancy week monitoring and other factors. Only through scientific and accurate estimation of the expected date of birth can we better arrange prenatal and postnatal care and ensure the smooth birth of test tube babies.
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