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What are the formulas for calculating the expected delivery date of IVF?

What are the formulas for calculating the expected delivery date of IVF?



Formula for calculating the expected delivery date of test tube babies

In vitro fertilization (IVF) refers to the transfer of fertilized eggs into the mother's uterus to develop embryos. The expected date of birth is the time point of IVF birth. For patients and doctors, it is very important to accurately calculate the expected date of birth. The following will introduce several common formulas for calculating the expected birth date of test tube babies.

1. Last menstruation

The most commonly used calculation formula for the expected delivery period of test tube babies is based on the last menstruation method (LMP). According to this method, the expected date of delivery can be calculated by adding 280 days to the theoretical last menstrual day. However, this calculation method is not very accurate due to the difference between IVF pregnancy and natural pregnancy. The last menstruation method assumes that a woman's menstrual cycle is 28 days, and that fertilization occurs on the 14th day of the menstrual cycle. However, for women receiving IVF, they may have irregular menstrual cycle or have undergone ovulation therapy, so this simple calculation method often differs from the actual expected date of delivery.

2. B-ultrasonic detection method

B-ultrasound is a method to determine the expected date of delivery by measuring the size of the embryo. This method starts from the fixed period (usually 6 to 8 weeks after fertilization) of the fertilized egg after transplantation. There is a certain correlation between the fetal head hip length (CRL) measured by B-ultrasound and the fetal age. Through the results of B-ultrasound measurement, doctors can predict the fetal age according to the known fetal age curve and further calculate the expected date of birth. However, this method depends on the accuracy of measuring fetal size and fetal age curve.

3. Fertilization day method

Fertilization date method calculates the expected date of delivery according to the exact date of in vitro fertilization. By accurately determining the number of days an embryo is incubated in a petri dish, doctors can calculate the expected date of birth. Fertilization day method is an accurate calculation method, but it is only applicable to those embryos fertilized and cultured in the laboratory. For IVF infants using frozen embryos, this method is more challenging because the date of fertilization may not be determined.

4. Twin pregnancy method

IVF may be a multiple pregnancy, and the formula for calculating the expected date of delivery may be different for multiple pregnancy pregnant women. A commonly used formula is based on the expected date of delivery of twin pregnant women. In twin pregnancy, the fetus with a shorter expected delivery period is usually born around 37 weeks, while the fetus staying in the uterus for a longer time may be born around 39 weeks. Therefore, according to the situation of twin pregnant women, doctors can calculate the final expected date of delivery according to the expected date of each fetus.

Summary

There are many formulas for calculating the expected delivery date of IVF. The last menstruation method is the most commonly used but not accurate method. The B-ultrasound detection method can estimate the expected delivery date by fetal size, the fertilization date method is calculated by the fertilization date, and the twin pregnancy method is applicable to multiple pregnancies. It is very important for pregnant women and doctors to accurately calculate the expected date of birth of test tube babies, so that delivery and prenatal care can be reasonably arranged to ensure the safety of mothers and babies.
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