Introduction: Pregnant mothers all know that B-ultrasound is essential during pregnancy. B-ultrasound not only allows pregnant mothers to see the baby\’s appearance, but also checks the baby\’s physical health. Although B-ultrasound has little impact, it is still necessary to control the frequency of B-ultrasound. Let’s take a look at the best time to do a B-ultrasound during pregnancy.
Perhaps you already know that B-ultrasound can diagnose for you whether the baby\’s growth and development is normal, whether there are any deformities, whether the placenta position is suitable for natural delivery, and other issues. But, do you know how many B-ultrasounds should be done throughout pregnancy? If your answer is no, hear what the experts have to say!
Analyzing from the principle of B-ultrasound, B-ultrasound is ultrasonic wave transmission without ionizing radiation and electromagnetic radiation. It is a kind of sound wave transmission. This kind of sound wave is not harmful to human tissue.
However, this does not mean that B-ultrasound examinations can be performed at will throughout pregnancy without time and frequency restrictions. Experts point out that the number of B-ultrasounds required during pregnancy depends on the specific situation. Under normal circumstances, expectant mothers should have about 3 B-ultrasound examinations during pregnancy, and no more than 5 times at most.
The first check-up should be at 12-16 weeks of pregnancy
At 12 to 16 weeks of pregnancy, expectant mothers usually go to the hospital for their first ultrasound examination as directed by their doctor. At this time, B-ultrasound examination can determine whether it is a single pregnancy or multiple births, and can measure the size and development of the fetus. For example, measuring the length from the fetal head to the fetal hip is often used to determine the gestational age of the fetus in early pregnancy; measuring the biparietal diameter, head circumference, abdominal circumference and fetal femur length of the fetal head to determine the growth and development of the fetus. In addition, fetuses that are lagging behind in normal growth and development can also better understand their development by measuring the proportions of various parts of the body, such as the ratio of head circumference to abdominal circumference.
Through B-ultrasound examination, doctors can intuitively see the activities of the fetus in the mother\’s body, such as breathing and movement, including larger body movements, limb movements, and even small swallowing movements of the fetus. The doctor can also observe whether the fetal tone is good through B-ultrasound. Usually, when the fetus suffers hypoxic injury in the womb, the fetus\’ mobility will be significantly reduced or eliminated. It is difficult to detect these changes without a B-ultrasound.
In addition to routine examination of the fetus, B-ultrasound can also determine whether the intrauterine pregnancy is normal. If no signs of pregnancy are detected in the uterine cavity, but an abnormal mass is found outside the uterine cavity, combined with other clinical manifestations and laboratory test results, the possibility of ectopic pregnancy can be considered. Therefore, it is generally recommended to do a B-ultrasound examination in early pregnancy to determine whether it is a normal pregnancy or a mole. Once an abnormality is discovered, the pregnancy can be terminated in time to reduce the impact and damage to the expectant mother\’s body.
The second check-up should be at 20-25 weeks of pregnancy
Mid-trimester B-ultrasound examination can help expectant mothers understand the growth and development of the fetus, as well as the position of the fetus and the amount of amniotic fluid. The amount of amniotic fluid is very important to the growth and development of the fetus. Too much or too little amniotic fluid may indicate fetalChildren with deformities. In every ultrasound report, the doctor records the amount of amniotic fluid.
At this stage, you can also use B-ultrasound to understand the condition of the placenta, such as the structure of the placenta, the maturity of the placenta, whether the placenta is separated from the uterine wall, bleeding, and other very important information. B-ultrasound can clearly understand whether the position of the placenta is normal, whether there are hemangiomas in the placenta, whether the relationship between the placenta and gestational age is consistent, and whether there are dangerous conditions such as placenta previa and placenta. Placenta detachment. Correct diagnosis is very important.
B-ultrasound testing during this period can not only predict the safety of the fetus, but also detect fetal abnormalities early, such as fetal limb malformations, cleft lip and palate malformations, etc.
The third examination should be between 37 and 40 weeks of pregnancy
B-ultrasound at this stage can help expectant mothers observe the fetal position, fetal size, placental maturity, whether the umbilical cord is around the neck, etc., make a final assessment before delivery, and make various prenatal preparations, so this B-ultrasound is very important.
This examination can estimate the weight of the fetus based on the measurement of the fetal head diameter and bones, determine the fetal position, and predict whether the expectant mother can give birth normally. Normally, natural delivery can be achieved with the baby\’s head down, his face facing the expectant mother\’s spine, and his back facing outward. At the same time, the doctor will also check the position of the placenta, which should be in the upper part at this time to prepare for the birth of the fetus.
At this stage, as long as the expectant mother has special circumstances, such as fetal tachycardia, unexplained abdominal pain, etc., or the doctor suspects intrauterine hypoxia, wants to determine the location of the placenta, suspects multiple pregnancy, or suspects congenital malformations, etc., the expectant mother will be recommended to do B Super check.
Special reminder: B-ultrasound examination time should not be too early
Experts believe that under normal circumstances, expectant mothers within 12 weeks of pregnancy are best not to undergo B-ultrasound examinations, especially in the early stages of pregnancy. However, there are exceptions in special circumstances, such as vaginal bleeding in early pregnancy. B-ultrasound examination is required to rule out ectopic pregnancy, threatened abortion or molar pregnancy to determine whether the embryo is viable, whether the pregnancy can continue, and whether the pregnancy is abnormal. When the gestational age does not match the size of the abdomen, a B-ultrasound examination is also required to understand the development of the fetus and observe whether fetal arrest has occurred.