If you find out that you are pregnant after having a chest X-ray before your period, are you afraid? It is common knowledge that X-rays and CT examinations have radiation, and it is this “common knowledge” that makes many people “afraid of talking about the rays”. The main effect of radiation is on the egg or fertilized egg, which may lead to miscarriage and fetal abnormalities. Pregnant women are justifiably concerned, but the risks of diagnostic tests may not be as serious as they think. Although it is important to prevent radiation exposure during pregnancy, appropriate diagnostic imaging is safe for the fetus in some trauma pregnancies. In general, the possible effects of radiation on the fetus must be based on three factors: the dose of exposure, the site of exposure and the duration of pregnancy. The dose of radiation from an ordinary chest X-ray is not enough to cause fetal malformation, even during pregnancy, but the higher the cumulative dose of radiation or the closer the site of exposure to the uterus, the higher the risk. Therefore, if you get pregnant after having a chest X-ray before pregnancy, there is no need to worry as long as there is no abnormality in the routine prenatal examination. It is common knowledge that X-rays and CT examinations have radiation, and it is this “common knowledge” that makes many people “fearful of talking about them”. There was even an article circulating on the internet for a while: “A single X-ray test caused a pregnant woman to lose her fetus, and doctors reminded her to stay away from radiation during pregnancy”, the propaganda of which can be imagined. Pregnant women are often justifiably concerned about the effects of radiation on their fetus, but the risks of diagnostic tests may not be as serious as they think. For some traumatized pregnant women, appropriate diagnostic imaging is safe for the fetus. A recent study by Dr. Jonas Matzon of Thomas Jefferson University, published in the Journal of the AAOS, confirms this view, concluding, “Despite the need to prevent fetal exposure to radiation, most diagnostic tests are safe. In general, the possible effects of radiation on the fetus must be determined by the dose, the location and the duration of pregnancy. The higher the cumulative dose of exposure or the closer to the uterus, the higher the risk.