Patient: Description of condition (onset, main symptoms, hospital visited, etc.): Hello Dr. Zhong, I am 11 weeks pregnant and I had a vaginal ultrasound at 10 weeks or so, the doctor prescribed it at that time and I didn’t know the harmful effects of these ultrasounds, and when I talked to my friends later, they said that vaginal ultrasound is not suitable for pregnant women, is that the case? If so. The vaginal ultrasound was done at more than 10 weeks. I hope to get a professional answer from Dr. Zhong. Guangzhou Red Cross Hospital Obstetrics and Gynecology Zhong Shaotao: Ultrasound examination is the use of higher than the frequency of sound waves (generally audible sound frequency of 20-20,000 Hz hz) 3.5-10Mhz ultrasound examination of pregnant women, the examination of pregnant women in the course of pregnancy may have several times, early pregnancy, 20 – 24 weeks of pregnancy, about 30-32 weeks of pregnancy and weeks, about 30-32 weeks and after 36 weeks of late pregnancy, if there are abnormalities increase the number of examinations. Mostly, black and white ultrasound with low power is used, but in 20-24 weeks of pregnancy, color ultrasound is mostly used for obstetric screening of the fetus to check if there are any abnormalities in fetal development. In order to understand the development of fetal embryos in the uterus in early pregnancy, most of the time black and white vaginal ultrasound is used, which will not affect the development of embryos in the uterus under normal circumstances and is clearer and simpler than abdominal ultrasound. Pregnant women who have symptoms of pre-eclampsia can also choose abdominal ultrasound if they are overly worried about miscarriage caused by the examination. However, transvaginal ultrasound is recommended for pregnant women who are in preterm labor or need to know the condition of the cervix. In fact, ultrasound examination is a relatively safe method for pregnant women and fetuses. The ultrasound probe can only affect the early embryo and fetus if it is aimed at one area for more than 20 minutes for a long time, but it is impossible to examine for such a long time during the actual examination. The ultrasound probe is often paused during the examination due to the measurement of relevant indicators, rather than continuously using the ultrasound probe to emit ultrasound. Patient: Director Zhong, thank you for your detailed answer, I have relaxed. Thank you again.