Is the number of days of pregnancy determined by ultrasound accurate?

For female friends, pregnancy is a major event in life. They hope to have a clear understanding of various conditions of pregnancy. Some pregnant mothers do not know how many days they are pregnant. After the B-ultrasound examination, they are very confused. So, is the pregnancy time shown by the B-ultrasound examination accurate? Next, let’s take a closer look at it!

The gestational age shown by B-ultrasound examination and the actual pregnancy may differ by 1-2 weeks, which is all within the normal range. The gestational age measured by ultrasound is also calculated based on the first day of the expected delivery date, so the actual pregnancy time may differ by one to two weeks. Doctors calculate the number of days to pregnancy, and they usually start counting from the first day of the last menstrual period, which is usually 2 weeks before ovulation. The reason for this calculation is that although most women cannot accurately understand their ovulation period, they know when their last menstruation began. The key to common problems before B-ultrasound in pregnant women are the following three points.

1. When going to the hospital for examination, it is best to wear loose and easy-to-put-on and off clothes and boots. This can save time and effort, and can also relax the originally anxious mood of the expectant mother. During the examination, try to relax and cooperate with the doctor's examination. If you are too anxious during the inspection, it may affect the effectiveness of the inspection.

2. Hold your urine early. When doing B-ultrasound in the early stages of pregnancy, a certain amount of urine needs to be accumulated in the bladder to be seen clearly, so expectant mothers are advised to hold their urine in advance. If in the early stages of pregnancy, due to special conditions such as abdominal pain, vaginal bleeding, etc., you need to do an ultrasound examination, then drink 4-6 cups of warm water at home in advance, and it will save time to go to the hospital for a physical examination. It is not necessary in the second and third trimesters of pregnancy.

3. Before doing B-ultrasound, do not eat foods that easily produce gas, such as milk, sweet potatoes, etc., because this will block the penetration of ultrasound waves and cause unclear images of the examined organs.