For expectant mothers during pregnancy, in order to have an understanding of the safety of their children, but there are also many pregnant women who are afraid of the safety of B-ultrasonic examination, and have many questions about how reasonable B-ultrasonic examination is, how many B-ultrasonic examinations should be done during pregnancy?
In the early stage of pregnancy (especially before 8 weeks of pregnancy), B-ultrasonic examination is usually not needed. Because this is the key period of fetal organ formation, and it is also an important stage of fetal malformation. Unless vaginal bleeding and abdominal pain (abnormal pregnancy should be excluded, such as ectopic pregnancy, hydatidiform mole, missed abortion), patients with pelvic mass or hysteromyoma before or during early pregnancy, B-ultrasonic examination is required to assist in diagnosis and provide basis for future treatment. If the time of menopause is not clear, it is difficult to correctly estimate the gestational age according to the symptoms and signs, it is generally more appropriate to check in the 10-13 weeks of gestation.
The organs of the fetus have been formed in the middle and late stage of pregnancy, and B-ultrasonic examination is relatively safe. B-ultrasonic examination should be carried out regularly from the 20th week of pregnancy, but it is better not to exceed the following three times during the whole pregnancy:
The first time: about 20 weeks pregnant. The fetal head, spine, heart, lung, gastrointestinal tract, kidneys, bladder, external genitalia and limbs were observed. At this time, the fetal limbs are stretched out, which is the best time to check the deformity of limbs.
The second time: 24-32 weeks gestation. The deformity of nasolabia and heart can be found by observing the nasolabia and heart of fetus.
The third time: full-term pregnancy (37-41 weeks). At this time, we need to pay attention to fetal position, umbilical cord, amniotic fluid, placenta stage, estimation of fetal size, umbilical cord blood flow, and assessment of fetal intrauterine safety. Choice for clinicians
The timing and mode of delivery provide valuable reference indicators.
In addition, it is more necessary for pregnant women with the following high-risk factors to have fetal echocardiography at 24-28 weeks: those with a history of congenital heart disease; maternal diabetes, connective tissue disease; maternal exposure to special drugs or infection during pregnancy; maternal alcoholism; the history of older pregnant women and abnormal pregnancy; fetal arrhythmia, fetal edema, chromosomal abnormalities.
Generally, the above 3-4 times of B-ultrasonic examination is enough during pregnancy, but if there are abdominal pain, vaginal bleeding, frequent fetal movement, reduction and other abnormalities and unclear fetal position during pregnancy, B-ultrasonic examination shall be carried out according to the doctor's examination.