Pregnant women must know how to calculate the due date
The due date is a topic of great concern to pregnant women as it marks the imminent birth of the baby. But how do you calculate your due date? Let’s explain it in detail from four aspects.
1. Last menstrual period method
This is the most common method of calculating your due date, and it requires knowing the time of your last menstrual period. The method is to add 280 days to the first day of the last menstrual period to get the expected date of delivery. For example, if the last menstrual period started on September 1st, the expected date of delivery is June 6th.
However, some women have irregular menstrual cycles and the last menstrual period is not a definite time point. In this case, errors may occur when using the last menstrual period method, which needs to be judged based on other factors.
2.B-ultrasound method
B-ultrasound is a non-invasive examination method that can measure fetal size, development and other information. Through the B-ultrasound examination results, doctors can more accurately determine the expected date of delivery.
Generally speaking, the B-ultrasound method is more accurate than the last menstrual period method, but errors cannot be completely avoided. It is recommended that pregnant women undergo B-ultrasound examination early in pregnancy to more accurately calculate the expected date of delivery.
3. Fetal movement method
Fetal movement is a manifestation of fetal activity and can generally be felt around 20 weeks of pregnancy. By recording the fetal movements, the expected date of delivery can be gradually determined.
The principle of the fetal movement method is that the pregnant woman can feel the fetal movement, and then calculate it after the fetal movement has occurred for a period of time. If the result is close to the B-ultrasound examination result, the expected date of delivery can be determined.
4.Double monitoring method
The dual monitoring method refers to determining the expected date of delivery through cervical examination and fetal heart rate monitoring. It can improve the accuracy of due date calculation to ensure the safety of the fetus and pregnant women.
Cervical examination can determine the degree of cervical relaxation, and fetal heart rate monitoring can understand the development of the fetus. By combining the two methods, doctors can more accurately determine the due date.
Summary
The above are 4 commonly used methods for calculating due date. Each method has its advantages and disadvantages, and pregnant women can choose the appropriate method for calculation based on the actual situation. No matter which method is used, pregnant women are required to keep accurate records and assist doctors in making judgments to ensure the health of the baby and pregnant woman.
