How to accurately calculate the due date
Accurate calculation of the expected date of delivery is crucial for expectant mothers. It is the basis of pregnancy management and can help pregnant women make various preparations in time. There are many methods for calculating the due date. We can understand these methods through the following aspects.
First, calculate the expected date of delivery based on the last menstrual period
The mother\’s last menstrual period is an important reference factor in calculating the expected date of delivery. The expected date of delivery is calculated by adding 280 days to the first day of the last menstrual period. For example, if the first day of your period is July 1, then your due date is April 7. However, this method is only an estimate and cannot predict the baby\’s birth time completely accurately.
Understand the most popular measurement tools
There are many maternity period calculation tools and APPs on the market. These tools can help mothers calculate the due date more quickly. They are easy to understand and have a high popularity rate. Calculate your due date by entering the first day of your last menstrual period and the length of your menstrual cycle. However, please note that everyone\’s menstrual cycle is different. Only under the assumption that the menstrual cycle is stable and approximate, the expected date of delivery calculated by this method will be more accurate.
Doctor’s professional evaluation
If the pregnant mother has complex physiological conditions, the due date may not be calculated based on the last menstrual period. A maternity doctor may need to know detailed health information or perform certain tests to determine the due date.
2. Follicle-stimulating hormone serum method
Before 9 weeks of gestation, fetuses are similar in size and development rate, so the timing of their birth cannot be accurately predicted. However, starting in the prenatal period, the size and rate of development of the fetus will vary. The PAPP-A (follicle-stimulating hormone) serum test can determine the expected date of delivery by assessing the PAPP-A concentration in the woman\’s blood plasma and the thickness of the zona pellucida on the fetal surface.
Advantages of the method
This method is relatively accurate and can calculate the expected date of delivery more accurately than the previous method. Moreover, this method does not require testing early in pregnancy, but only requires evaluation after 9 weeks of pregnancy.
Defects of the method
The method is complicated and requires professional examination by medical staff. In addition, this method also has a certain possibility of failure and cannot be applied to all groups of pregnant women.
3. Calculation method of expected delivery date based on fetal size
The due date is predicted by measuring the size of the fetus through ultrasound, which is usually done around 20 weeks into pregnancy. By analyzing the morphology of the fetus, the analysis of the next due date may be more accurate. This method is usually done by a doctor.
Advantages
The accuracy of this method is relatively good, it is the only prediction tool that can observe fetal development, and can provide important information for solving labor problems.
Defects
It requires the support of professional medical institutions to conduct more complex and expensive examinations.
Summary
In short, there are many ways to calculate the due date, includingIncluding the last menstrual period, professional evaluation by a doctor, follicle-stimulating hormone serum method, calculation method of expected delivery date based on fetal size, etc. Each of these methods has its advantages and disadvantages, but combining the results of various methods is the best way to eliminate errors. Pregnant women can consult a doctor at any time to learn more about their specific situation and determine the most appropriate method based on their actual situation.
