Ultrasound uses sound waves, not ion rays. So far, there is no report of fetal injury caused by diagnostic ultrasound, including Doppler ultrasound. This is why modern obstetrics and gynecology do not use X-rays, but use ultrasound routinely. Because ultrasound diagnosis is based on morphology, ultrasound can't diagnose when the morphology changes little or nothing (such as abnormal eyes and ears, abnormal curvature and angle of limb joints, abnormal fingers and toes, etc.). ). Therefore, even if no abnormality is found by ultrasound, the possibility of fetal problems cannot be ruled out 100%.
Healthy expectant mothers should have at least two B-ultrasound examinations during pregnancy, once in 20~24 weeks. This is a very important examination to observe whether there is obvious abnormality in fetal development. Does the growth meet the expected delivery date? Is placental amniotic fluid normal? The other time, during the 32~34 weeks of pregnancy, the deformity was further investigated to observe whether the fetus grew normally in the uterus and the changes of placental amniotic fluid.
Pregnant women have done too much B-ultrasound, okay? As we all know, B-ultrasound is a kind of infrared ultrasonic detection, which has radiation. Although the development of science and technology has reduced the radiation to the lowest point, it will still hurt the fetus if it is done too much, so we suggest doing B-ultrasound moderately, which will have an impact on the fetus.