37-week fetal abdominal circumference standard value

It is said that the ten months of pregnancy are the most difficult for a pregnant woman. In fact, most pregnant women give birth in more than nine months. That is, in the 40th week, the baby will be eager to come out of the pregnant woman's body to see the new world outside. When the pregnant woman is 37 weeks pregnant, it is not far from the due date. So what is the standard value of the fetal abdominal circumference at 37 weeks of pregnancy? The following is a detailed introduction.

"In fact, any baby born after 37 weeks of pregnancy (including 37 weeks) is considered full-term, and any baby born before 37 weeks is called a premature baby. So, what are the values ​​of the various indicators for babies born at full term?

Below, the doctor will analyze the values ​​of the full-term fetus's biparietal diameter, head circumference, femur length, abdominal circumference, height, weight, and other indicators for your reference.

Biparietal diameter

The biparietal diameter of the fetal head is the length of the widest part between the left and right sides of the fetal head, called the "greater transverse diameter of the head", also known as BPD.

The minimum diameter of the birth canal for the fetus to pass through is the transverse diameter of the pelvic outlet. If the biparietal diameter is larger than the transverse diameter of the pelvic outlet, it becomes a question whether the baby can be delivered naturally, but the final choice still depends on the mother's pelvis and the size of the baby at full term.

The standard biparietal diameter of a full-term baby should be 9.3 cm or above.

Biparietal diameter standard: The value of the biparietal diameter is consistent with the month.

At 37 weeks of pregnancy, the biparietal diameter of the fetus is 7.0 cm. The biparietal diameter of a 38-week fetus is 8.0 cm. The biparietal diameter of a 39-week fetus is 9.0 cm. At 40 weeks of pregnancy, the biparietal diameter of the fetus is 10.0 cm.

Head circumference

Head circumference refers to the maximum length around the fetal head. Generally, the head circumference is the length from the "root of the nose at the forehead" to the "occipital protuberance at the back of the head", that is, the length around the occipital-forehead diameter.

37-week head circumference value: 331mm. 38 weeks head circumference value: 336mm. 39-week head circumference value: 341mm. 40-week head circumference value: 345mm.

Head circumference can be measured with a tape measure while standing, sitting or lying on your back. Fix the 0 point of the tape measure on the upper edge of the eyebrow arch on one side of the head. Keep the tape measure close to the scalp (if there is too much hair, push it aside). Go around the highest point of the occipital tuberosity and the upper edge of the eyebrow arch on the other side and return to the 0 point. This is the length of the head circumference.