It is important to accurately calculate the due date during pregnancy in order to prepare for delivery and avoid being flustered when the baby arrives. Therefore, when going to the hospital for prenatal check ups after pregnancy, doctors will ask the pregnant woman about the last menstrual period time, because doctors can calculate the due date based on the last menstrual period time. So, is the estimated due date from the last menstrual period accurate?
The accuracy of calculating the due date based on the last menstrual cycle is not high, only 50%. If the menstrual cycle is very regular, between 28 and 35 days, the accuracy will be relatively higher. For some cases of irregular menstruation or re pregnancy before the recovery of lactation menstruation, the accuracy is relatively low. In addition, some women do not remember the time of their last menstrual cycle very clearly, only recording an approximate time, which can also lead to deviation in the calculation of the due date.
The estimated due date based on the last menstrual period is only a reference in clinical practice. Pregnant women will undergo multiple B-ultrasound examinations throughout the entire pregnancy period. In the early stages of pregnancy, doctors will use B-ultrasound to detect the fetal head and arm length, combined with the time of early pregnancy reactions, fetal movement, abdominal circumference, and uterine height to calculate the pregnant woman's due date. If there is a deviation between the B-ultrasound estimated due date and the clinical estimated due date, B-ultrasound detection should be the main method.
