How to calculate the expected date of delivery after pregnancy with test tube baby method
The IVF method is an assisted reproductive technology. The fertilized eggs are cultured and developed in the laboratory, and then healthy embryos are transferred to the mother's uterus for natural pregnancy. For successful pregnant couples, it is very important to calculate the expected date of delivery. The expected date of delivery can not only help expectant mothers understand the growth and development of the fetus, but also provide doctors with better guidance and monitoring programs. Next, we will introduce in detail how to calculate the expected date of delivery after IVF pregnancy from four aspects: the last menstruation method, B-ultrasound method, LMP method and basic body temperature method.
Last menstruation
The last menstruation is one of the most commonly used methods to calculate the expected date of delivery. According to the first day of the last menstrual period, the cycle of a month is usually 28 days. The basic principle of this method is that at the early stage of pregnancy, the embryo has not been formed, and the specific fertilization date cannot be confirmed, so the pregnancy duration can only be calculated from the estimated last menstruation. Generally speaking, the calculation results of the last menstruation method are more accurate, but not applicable to all people.
Sometimes, due to the influence of irregular menstrual cycle, ovulation time and other factors, the estimated delivery date calculated by the last menstruation method may have errors. Therefore, in the actual use process, doctors will generally use other methods to judge and determine the expected date of delivery.
B-ultrasonic method
B-ultrasound is a method to judge the fetal development and estimate the expected date of delivery through ultrasonic examination. Through B-ultrasound examination, doctors can observe the growth and development of the embryo, including the size and heartbeat of the fetus. Doctors can estimate the expected date of delivery based on the size and shape of the fetus.
After IVF pregnancy, the doctor will conduct regular B ultrasound examination to determine the expected date of delivery by observing the growth of the fetus. Generally speaking, the results of the first ultrasound examination are relatively accurate. With the increase of the gestational age, the error of estimating the expected date of delivery by B-ultrasound will gradually decrease.
LMP method
LMP is a method to calculate the expected date of delivery by measuring, recording and calculating the time of the last menstruation. The expected date of delivery is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period. LMP method is relatively simple and suitable for women with regular menstrual cycle, but not for people with irregular menstrual cycle.
It should be noted that LMP method is only a rough calculation method, without considering the specific fertilization time and embryo development speed, so the calculation results may have some errors. Therefore, in practical application, doctors will combine other methods and inspection means to determine the expected date of delivery.
basal body temperature
The basic body temperature method is a method to judge ovulation and calculate the expected date of delivery by recording the body temperature changes after waking up every morning. Generally speaking, the body temperature will rise slightly after ovulation, and then drop after a period of time. By observing the changes in the temperature curve, we can roughly predict the time of ovulation, so as to calculate the expected date of delivery.
The basic body temperature method is suitable for women who regularly record their body temperature. However, due to many factors, such as disease, stress, insomnia, etc., the change of body temperature may be interfered, thus affecting the accuracy of the results. Therefore, when using the basic body temperature method to calculate the expected date of delivery, other methods and examinations should be combined to judge.
Summary
Test tube baby is a kind of assisted reproductive technology. It is very important to calculate the expected date of birth for successful pregnant couples. This article introduces how to calculate the expected date of delivery after IVF pregnancy from four aspects: the last menstruation method, B-ultrasound method, LMP method and basic body temperature method. Each method has its advantages and disadvantages. The most accurate result is to judge by combining multiple methods and inspection means. Knowing and determining the accurate expected date of birth will help mothers to make reasonable arrangements for life and prenatal preparation, and will also provide doctors with better guidance and monitoring programs.
