Pregnancy check ups, one of which is ultrasound examination, can be said to be an essential part of monthly pregnancy check ups. Pregnant women can clearly see the various developmental stages of the fetus and the activity of the fetus in the mother's womb through ultrasound examination results. So, how should we view the ultrasound data? Many mothers don't know, do they!
Comparison Table of Ultrasound Data during Pregnancy
4 weeks: The fetus is only 0.2 centimeters. The fertilized egg has just completed implantation and the amniotic cavity has just formed, which is very small in volume. Ultrasound still cannot detect signs of pregnancy.
5 weeks: The fetus grows to 0.4 centimeters, enters the embryonic stage, the amniotic cavity expands, the primitive cardiovascular system appears, and there may be pulsation. B-ultrasound can show a small gestational sac, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen.
6 weeks: The fetus grows to 0.85 centimeters, and the fetal head, brain vesicles, frontal and facial organs, respiratory, digestive, nervous and other organs differentiate. The fetal sac is clearly visible on B-ultrasound, and fetal buds and heartbeat can be seen.
7 weeks: The fetus grows to 1.33 centimeters, the embryo has taken on human embryonic form, all body segments have differentiated, limbs have separated, and various systems have further developed. B-ultrasound clearly shows the fetal bud and heartbeat, with the fetal sac occupying approximately one-third of the uterine cavity.
8 weeks: The fetus grows to 1.66 centimeters in length, with a predetermined fetal shape that can be divided into a fetal head, body, and limbs. The fetal head is larger than the torso. Ultrasound shows that the fetal sac occupies about 1/2 of the uterine cavity, and the fetal morphology and movement are clearly visible, with the yolk sac visible.
9 weeks: The fetus grows to 2.15 centimeters in length, with the fetal head larger than the fetal body and clearer manifestations in various parts. The head begins to calcify and the placenta begins to develop. Ultrasound shows that the gestational sac almost occupies the uterine cavity, the fetal contour is clearer, and the placenta begins to appear.
10 weeks: The fetus grows to 2.83 centimeters, all organs of the fetus have formed, and the embryonic form of the placenta is formed. Ultrasound shows that the gestational sac is beginning to disappear, the crescent shaped placenta is visible, and the fetus is active in the amniotic fluid.
11 weeks: The fetus grows to 3.62 centimeters, and its various organs further develop, including the development of the placenta. Ultrasound shows complete disappearance of the gestational sac and clear visibility of the placenta.
12 weeks: The fetus grows to 4.58 centimeters, with initial development of the external genitalia. If there are abnormalities, they can be manifested, and the calcification of the head becomes more complete. The skull halo is clear, the biparietal diameter can be measured, and obvious deformities can be diagnosed. Afterwards, various organs tend to improve.
At 13 weeks of pregnancy, the average biparietal diameter was 2.52 ± 0.25, the average abdominal circumference was 6.90 ± 1.65, and the femur length was 1.17 ± 0.31.
At 14 weeks of pregnancy, the average biparietal diameter was 2.83 ± 0.57, the average abdominal circumference was 7.77 ± 1.82, and the femur length was 1.38 ± 0.48.
At 15 weeks of pregnancy, the average biparietal diameter is 3.23 ± 0.51, the average abdominal circumference is 9.13 ± 1.56, and the femur length is 1.74 ± 0.58.
At 16 weeks of pregnancy, the average biparietal diameter was 3.62 ± 0.58, the average abdominal circumference was 10.32 ± 1.92, and the femur length was 2.10 ± 0.51.
At 17 weeks of pregnancy, the average biparietal diameter was 3.97 ± 0.44, the average abdominal circumference was 11.49 ± 1.62, and the femur length was 2.52 ± 0.44.
At 18 weeks of pregnancy, the average biparietal diameter was 4.25 ± 0.53, the average abdominal circumference was 12.41 ± 1.89, and the femur length was 2.71 ± 0.46.
At 19 weeks of pregnancy, the average biparietal diameter was 4.52 ± 0.53, the average abdominal circumference was 13.59 ± 2.30, and the femur length was 3.03 ± 0.50.
At 20 weeks of pregnancy, the average biparietal diameter is 4.88 ± 0.58, the average abdominal circumference is 14.80 ± 1.89, and the femur length is 3.35 ± 0.47.
At 22 weeks of pregnancy, the average biparietal diameter was 5.45 ± 0.57, the average abdominal circumference was 16.70 ± 2.23, and the femur length was 3.82 ± 0.47.
At 24 weeks of pregnancy, the average biparietal diameter was 6.05 ± 0.50, the average abdominal circumference was 18.74 ± 2.23, and the femur length was 4.36 ± 0.51.
At 26 weeks of pregnancy, the average biparietal diameter was 6.68 ± 0.61, the average abdominal circumference was 21.62 ± 2.30, and the femur length was 4.87 ± 0.41.
At 28 weeks of pregnancy, the average biparietal diameter was 7.24 ± O.65, the average abdominal circumference was 22.86 ± 2.41, and the femur length was 5.35 ± 0.55.
At 30 weeks of pregnancy, the average biparietal diameter was 7.83 ± 0.62, the average abdominal circumference was 24.88 ± 2.03, and the femur length was 5.77 ± 0.47.
At 32 weeks of pregnancy, the average biparietal diameter was 8.17 ± 0.65, the average abdominal circumference was 26.20 ± 2.33, and the femur length was 6.43 ± 0.49.
At 34 weeks of pregnancy, the average biparietal diameter was 8.61 ± 0.63, the average abdominal circumference was 27.99 ± 2.55, and the femur length was 6.62 ± 0.43.
At 36 weeks of pregnancy, the average biparietal diameter was 8.81 ± 0.57, the average abdominal circumference was 29.44 ± 2.83, and the femur length was 6.95 ± 0.47.
At 38 weeks of pregnancy, the average biparietal diameter was 9.08 ± 0.59, the average abdominal circumference was 30.63 ± 2.83, and the femur length was 7.20 ± 0.43.
At 39 weeks of pregnancy, the average biparietal diameter was 9.21 ± 0.59, the average abdominal circumference was 31.34 ± 3.12, and the femur length was 7.34 ± 0.53.
At 40 weeks of pregnancy, the average biparietal diameter was 9.28 ± 0.50, the average abdominal circumference was 31.49 ± 2.79, and the femur length was 7.40 ± 0.53.
The above is the normal range of various data on the ultrasound report that the editor wants to share with you today. Next time when you receive the ultrasound report, expectant mothers will definitely not be confused. According to this introduction by the editor, expectant mothers can see to what extent their babies have developed! More importantly, these normal values are used to observe whether there are any abnormalities in fetal development.
