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What is the calculation method of IVF pregnancy week?

What is the calculation method of IVF pregnancy week?



What is the calculation method of IVF pregnancy week?

In vitro fertilization (IVF) and other assisted reproductive technologies are used to combine the germ cells of men and women in the laboratory and cultivate them into embryos, and finally implant the embryos into women's uterus to achieve the purpose of pregnancy and fertility. The calculation method of IVF pregnancy period is different from that of natural pregnancy week. This article will elaborate on the basic concept of pregnancy week calculation, the determination of IVF date, the method of pregnancy week calculation and the actual cases in hospitals.

Basic concepts

The pregnancy week of test tube baby is calculated from the date of embryo transfer to the time when the uterus adapts to the cell mass. Generally speaking, the gestational week starts from the first day of the last menstruation. About two weeks after embryo transfer is called the third week of pregnancy until the birth of the fetus. It should be noted that the calculation method of IVF pregnancy week is mainly based on the date of embryo transfer, not the date of conception.

Determination of fertilization date

In the calculation of IVF pregnancy week, it is necessary to determine the fertilization date first. The determination of fertilization date is based on the development status of the embryo and the operation process of in vitro fertilization. Generally speaking, if ordinary in vitro fertilization technology is used, the fertilization date is usually within 24 to 48 hours after egg retrieval. If the method of embryo transfer is selected after the embryo is cultured to a specific development stage, the fertilization date will be determined according to the specific situation of the embryo development.

Calculation method of gestational week

The accurate calculation of IVF pregnancy week is very important for pregnancy management and embryo development evaluation. Common calculation methods include LMP method (calculated according to the first day of the last menstrual period), B-ultrasound method (calculated according to the embryo length and other indicators) and embryo transfer method (calculated from the date of embryo transfer). Among them, LMP method is the most common method, but for IVF, because the fertilization date is different from the natural pregnancy, using LMP method to calculate the gestational week may cause large errors. Therefore, embryo transfer is the most accurate method to calculate the gestational age of IVF infants.

Actual case of hospital

Take a real hospital as an example. The hospital has advanced IVF technology and rich clinical experience. In this hospital, the expert team will systematically analyze and calculate the pregnancy week of IVF according to the patient's relevant information, including the date of the last menstruation, the date of taking eggs, and the embryo culture. After embryo transfer, the hospital will regularly carry out ultrasonic examination to confirm the gestational age, and conduct pregnancy management according to the gestational age to ensure the healthy development of the fetus. To sum up, the calculation method of IVF pregnancy week mainly starts from the date of embryo transfer, and infers the date of fertilization through information such as the development status of the embryo and the date of the last menstruation. The embryo transfer method is the most accurate method for calculating the gestational age, and the hospital will carry out relevant calculation and ultrasonic examination according to the specific situation of the patient to ensure the accuracy of the gestational age and the health of the fetus. The calculation of IVF pregnancy week is very important to ensure the stable development of pregnancy and the health of embryos.
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