Detailed explanation of Tang screening examination items Tang screening is a prenatal examination. Parents can not only understand the physical condition of the fetus, but also detect certain abnormalities early and provide early intervention and treatment. Next, we will start with the common Tang screening inspection items in China and explain their inspection contents in detail. Part One: Fetal Ultrasound Examination The more important part of the Tang screening examination is fetal ultrasound examination. During the examination, the doctor will use ultrasound technology to observe the growth and development of the fetus, including measuring the fetal head circumference, abdominal circumference,