16 weeks of pregnancy need to do ultrasound, blood pressure and glucose measurement, weight measurement, uterine height, Down’s syndrome screening, etc. If there are other abnormalities, then it is necessary to increase or decrease the examination according to the doctor’s instructions. 1. Ultrasound: 16 weeks of pregnancy is the mid-pregnancy stage, at this time you can see the growth and development of the fetus through ultrasound, used to determine the size of the fetus, the amount of amniotic fluid. 2. Measurement of blood pressure, maternal weight, uterine height, etc.: First of all, it is necessary to see whether the uterine height is in line with the gestational week, combined with the pregnant woman’s weight to see whether there is overweight or excessive weight gain, so as not to cause fetal macrosomia. 3. Down’s syndrome screening: at 16 weeks of pregnancy, it is necessary to do Down’s syndrome screening to determine whether there is a risk of chromosome-related diseases, and if the results are abnormal, the next prenatal examination can be carried out as soon as possible. It is very important to have an obstetrical examination during pregnancy to detect any abnormality and seek prompt medical attention.