Pregnant women can have a color ultrasound of the heart if clinically necessary. It is true that color ultrasound is clinically associated with a certain amount of radiation, but this radiation is a safe dose that does not affect the pregnant woman or the fetus, so it can be done with confidence. It is also recommended that pregnant women should have a clinical indication for a color ultrasound, and that the physician should determine whether or not a color ultrasound of the heart is necessary. If so, you can be assured that the test will be done. In addition, ultrasound examination is also required during pregnancy, for example, once in early pregnancy, once in mid-pregnancy, and 4-dimensional ultrasound examination from 23 to 28 weeks of pregnancy, mainly to clinically rule out the possibility of fetal malformation. In addition, an ultrasound examination is required before the delivery or around the expected date of delivery.