Release date: 2016-08-19 Although it is safer to do B-ultrasound during pregnancy, this does not mean that you can do it without time and number of restrictions. Generally speaking, the best time for pregnant women to do four-dimensional color Doppler ultrasound is 20 to 28 weeks of pregnancy, because the limbs and major organs of the fetus have all developed during this period, and amniotic fluid is more suitable for fetal malformation screening. However, due to the individual differences of pregnant women, the specific time of the individual should also be consulted by a specialist in a regular hospital, according to the doctor's advice. The four-dimensional advantage is the ability to provide a stereoscopic fetal image, but the four-dimensional B-ultrasound does not increase the accuracy of the diagnosis. Recently, the American Obstetrics and Gynecology Association does not recommend to do 4D B-ultrasound, especially when it is 1 to 2 months pregnant, it is not recommended to do 4D color ultrasound. Some hospitals use the four-dimensional B-ultrasound image as a commemoration, which is also discouraged at home and abroad. It is worth reminding that B-ultrasound is generally considered to be ultrasonic conduction, there is no ionizing radiation and electromagnetic radiation, and there is no harm to the human body. However, the color ultrasound energy is greater than the ordinary B-ultrasound, and the operation depends on the qualifications, proficiency and mastering time of the personnel. It is necessary to avoid continuous exposure to an organ for a long time and to control the minimum dose. Therefore, the expectant mother must go to the regular hospital, and the professional doctor will perform the B-ultrasound operation. Source: Changjiang Business Daily Endotracheal Tube,tube endotracheal,endotracheal tube holder,oral endotracheal tube,endotracheal tube price Anesthesia Medical Co., Ltd. , https://www.honestymed.com
Ultrasound examination does not require more than four-dimensional color ultrasound carefully selected
Usually, 3 to 4 times of color ultrasound can be done during the whole pregnancy. The first is the early pregnancy stage, usually in the 11-14 weeks of pregnancy, the purpose is to exclude ectopic pregnancy, check whether the embryo survives; the second is the second trimester, usually 18 to 24 weeks, the purpose is to screen the fetus for malformation; The third time is the third trimester, usually 32 to 36 weeks, check the fetal position, placenta, amniotic fluid, determine the delivery time.