What is the formula for calculating the expected delivery date of test tube babies?
The expected date of birth of test tube babies refers to the expected date of birth of babies born through assisted reproductive technology. Because IVF pregnancy is different from natural pregnancy, a special formula is needed to predict the expected date of delivery. The following will elaborate the formula for calculating the expected delivery date of IVF from four aspects: menstrual history, embryo transfer date, progesterone concentration and embryo development.
Menstrual history
The time of the patient's last menstruation should be determined first in the calculation of the test tube baby's expected date of birth, usually starting from the first day of the last menstruation. On this basis, plus 280 days (about 40 weeks) is the expected date of delivery. This formula is applicable to women with regular menstruation and stable cycle. Their ovulation time is relatively fixed, which is more suitable for calculating the expected date of childbirth.
However, not all IVF mothers apply this menstrual history formula. Under special circumstances, doctors may adjust the expected date of delivery according to individual differences. Therefore, when calculating the expected production period, it is also necessary to conduct a comprehensive assessment in combination with other factors.
Date of embryo transfer
The date of embryo transfer is also one of the important indicators for calculating the expected delivery date of IVF. After embryo transfer, it usually takes about 10-14 days for the embryo to be successfully implanted into the uterus. Therefore, the date of embryo transfer plus about 280 days is the expected date of delivery.
It should be noted that the calculation of the expected delivery date after embryo transfer is not completely accurate. Because the time of implantation into the uterus after pregnancy may vary according to individual differences, and the speed of embryo development will also vary from person to person. Therefore, this formula is only for reference, and the actual expected production date may be slightly different.
Progesterone concentration
Progesterone is an important progesterone, which will increase after the successful implantation of IVF embryos. Doctors can assess the development of embryos by measuring the concentration of progesterone. According to different progesterone concentrations, the embryonic development stage can be preliminarily inferred, and the expected date of delivery can be calculated accordingly.
The detection of progesterone concentration usually needs to be carried out 10-14 days after embryo transfer, when progesterone level begins to rise. According to the progesterone concentration reported by the laboratory to calculate the expected date of delivery, it can provide a more accurate prediction.
Embryo development
The development of embryos can also be used as an important basis for calculating the expected date of IVF. By observing the growth and development of embryos, combining the information of progesterone concentration and embryo transfer date, doctors can predict the expected date of delivery more accurately.
Doctors usually determine the due date of birth according to the development stage and standards of the embryo. For example, when the embryo develops to the blastocyst stage, it is estimated that there are about 40 weeks left before the expected date of delivery.
Summary
The formula for calculating the expected delivery date of IVF mainly includes menstrual history, embryo transfer date, progesterone concentration and embryo development. By comprehensively considering these factors, doctors can give a relatively accurate expected date of birth. However, it should be emphasized that the calculation of the expected date of IVF is only a prediction, and the actual expected date may be biased. Therefore, it is recommended that patients should closely communicate with doctors throughout the pregnancy and receive regular prenatal examination to ensure the health of mothers and babies.
