Placenta will gradually mature with the increase of pregnancy. When it matures to a certain extent, its function will decline and age, which is manifested by the change of placental echo on ultrasound. If the placental function is aging and declining, it may not be able to provide enough oxygen and nutrition for the fetus normally.
Ultrasonic measurement of placental maturity can be divided into four grades: 0,/kloc-0, 2 and 3. Grade 0 is usually immature placenta in the first and second trimester of pregnancy, and grade I is mature, and the early performance is about 29 ~ 36 weeks. Grade II indicates that the placenta is basically mature, and most full-term pregnancies are grade II placenta. Grade III placenta means that the placenta has matured and aged. At this time, under ultrasound, a large number of light spots with strong echo can be seen in the placenta, surrounding the placenta lobules, suggesting that the placenta has calcification and cellulose deposition. In this case, the placenta's ability to transport oxygen and nutrients will be reduced, and the fetus may be deprived of oxygen in the uterus.
Premature placenta also means rapid placental aging, which may easily lead to insufficient oxygen supply to the fetus and even fetal growth retardation. However, in recent years, this ultrasonic diagnosis method has been gradually abandoned, and more attention is paid to the monitoring of pregnant women's fetal heart rate and complications to comprehensively judge placental function.