Gestational biparietal diameter standard reference table

All expectant mothers are familiar with the biparietal diameter (BPD). It mainly refers to the length of the widest area from one side to the other side of the fetal head. Doctors and nurses can clearly see the biparietal diameter of the baby through B-ultrasound, and thus judge the growth and development of the baby. So what are the regularities in the correspondence table between the biparietal diameter of the fetus in the early stage and the number of weeks of pregnancy? Let's look down together.

Standard reference table of biparietal diameter according to gestational week

1. Expectant mothers can go to the hospital for B-ultrasound to check the baby's biparietal diameter after 12 weeks of pregnancy. At 13 weeks of pregnancy, the baby's biparietal diameter has reached 2.52 cm. Of course, this value is not absolute. As long as it does not exceed 0.25 cm, it is basically within the normal range.

2. When the expectant mother is 14 weeks pregnant, the average biparietal diameter of the baby is about 2.83 cm. Of course, due to the different time of embryo implantation and the different growth rates of the babies, the values ​​of the biparietal diameter of the babies are also different. Some babies may be slightly higher, and some may be lower. The fluctuation should not exceed 0.57 cm.

3. Next are mothers who are 15 weeks pregnant. The baby's biparietal diameter is about 3.23 cm. By extension, the baby grows at an average rate of about 0.4 cm per week. Of course, the individual differences of each baby will result in different data for the fetal biparietal diameter. Mothers also need to go to the hospital for an ultrasound examination and follow the doctor's advice to judge the baby's growth and development status.

The so-called fetal biparietal diameter refers to the widest length between the upper and lower sides of the fetal head. Doctors often use it to observe the growth and development of the child, determine whether there is cephalopelvic disproportion, and then ensure a smooth delivery. The standard correspondence table for fetal biparietal diameter is only a standard value. It does not mean that every fetus must conform to it. As long as it is within a certain range, it is all normal. The data displayed by B-ultrasound is also related to the accurate measurement of the fetal position and the doctor's experience, so there is no need to worry too much.