In general, the due date can be calculated based on the last menstrual period or ultrasound. Both methods can be used to estimate the due date of a pregnant woman, which can cause confusion for some women with decision-making difficulties. They do not know which method to use or which one will be more accurate. So, is full-term according to ultrasound or due date?
The due date is generally calculated based on the last menstrual cycle, and only when the pregnant woman cannot remember the menstrual cycle clearly, ultrasound can be used. In clinical practice, for ease of calculation, pregnancy is usually counted from the first day of the last menstrual period, and full-term pregnancy lasts about 280 days (40 weeks). Generally speaking, it is more accurate to calculate based on menstruation. Ultrasound is used to determine the time of pregnancy based on the size of the fetus, so there may be differences in the estimated due to the uneven development of the fetus, which may be larger or smaller than the normal gestational age.
If pregnant women cannot remember the date of their second menstrual period in the late Qing Dynasty, they can calculate based on the date of fetal movement. Generally, fetal movement begins at 18-20 weeks after pregnancy. The calculation method is as follows: primiparous women have a fetal movement date plus 20 weeks, and multiparous women have a fetal movement date plus 22 weeks. The estimated due date is usually calculated using ultrasound in the early stages of pregnancy, but in the later stages of pregnancy, it is still more accurate to calculate the due date based on the last menstrual period.
The due date can remind mothers of the safe time range for the birth of the fetus, but do not judge the due date so accurately. At 37 weeks of pregnancy, it is important to be prepared for childbirth at all times, but do not be overly anxious. Let nature take its course. If there are no signs of childbirth by 41 weeks of pregnancy, those who have the conditions should be hospitalized for observation or undergo timely labor induction. After 37 weeks of pregnancy, it is called full-term pregnancy. If there is a significant difference between the expected delivery date and the estimated gestational age of the fetus through ultrasound examination, a comprehensive evaluation should be made before making a judgment.
