超声Examination对胎儿有没有影响
Aug 30, 2021
Source: Cainiu Health
Dr. Chu Hang
Introduction
目前我们认为超声Examination对胎儿没有大的影响。反而是那种电磁波，比如X光、CT等，不Recommendation这样去做。另外我们现在有一个比较好的Examination方案，如果超声发现胎儿有一些具体的，比如是脑部、腹部等结构异常，我们还Recommendation做一个MR，磁共振。
Currently, ultrasound examination is considered safe for the fetus, with no significant adverse effects reported. Many ultrasound physicians are women who continue performing obstetric ultrasounds throughout their entire pregnancies without taking time off—and no adverse fetal outcomes have been observed among their own children. Therefore, ultrasound is currently regarded as safe for fetal development. In contrast, ionizing radiation—such as that from X-rays or CT scans—is not recommended during pregnancy.
Additionally, we now have an optimized diagnostic protocol: if ultrasound reveals specific structural abnormalities—such as in the brain or abdomen—we recommend follow-up fetal magnetic resonance imaging (MRI). Although MRI involves acoustic noise and magnetic fields, which may theoretically pose some risk to the fetus, current evidence suggests it is safest to perform fetal MRI after 20 weeks’ gestation. Ultrasound, however, carries no such gestational timing restrictions.
Of course, during early pregnancy, we generally recommend limiting ultrasound examinations to a single scan before 6–7 weeks’ gestation, performed as briefly as possible—primarily to minimize potential thermal effects, since ultrasound can generate localized heat. Prolonged or repeated exposure directly over the fetus is therefore discouraged, although routine clinical use remains extremely safe.
