How long is the femur of a normal full-term fetus?

Femoral length is an index for doctors to check pregnant women mechanically, which refers to the length of fetal femur. Doctors use it to judge the development of the fetus, let prospective parents know about the development of the fetus, and let them rest assured. Then, someone asked: What is the femur length of a normal full-term fetus? Look down if you want to know.

What is the femur length of a normal full-term fetus? For pregnant women, we should have a certain understanding. But the most important thing is to check the fetal condition of pregnant women with B-ultrasound with the help of doctors, so that the fetal femur length can be used to judge the fetal development. By observing the length of fetal femur, we can judge whether the fetus develops healthily.

Femur and humerus are both typical long tubular bones in human body, which are divided into two ends. The femur is the largest long bone in the human body, which refers to the thigh bone; The humerus is located in the upper arm, also known as the upper arm bone. So as the name implies, the length of femur is the length of femur, and the length of humerus is the length of upper arm bone.

Femoral length and humeral length are both fetal biological indexes to predict fetal weight. However, fetal humeral length is superior to femoral length in predicting fetal weight.

Femoral length is also one of the important data for calculating fetal weight during pregnancy. With the increase of gestational age, the value of femur length will gradually increase, which shows that the length and weight of fetus are gradually increasing.

In the second and third trimester of pregnancy, because the baby moves in mommy's stomach, the fetal position is different, and the operation of different doctors is also different, which will cause digital errors and sometimes even great fluctuations. After 30 weeks, the error of last week and next week is allowed, so when pregnant mothers see that the report results are different from the normal value, they don't have to be too nervous. If there are problems after the audit, consult experts and seek solutions.

With the increase of gestational age, the value of femur length will gradually increase, which shows that the length and weight of fetus are gradually increasing.

1.37 weeks fetal femur length: 7.10 0.52,72 72 mm.

2.38 weeks fetal femur length: 7.20 0.43,73 mm.

3.39 weeks fetal femur length: 7.34 0.53,75 mm. ..

4.40 weeks fetal femur length: 7.40 0.53,76 mm. ..

The amniotic fluid of full-term fetus is more or less normal, and the amniotic fluid is filled in the amniotic sac. The amniotic fluid volume of normal full-term pregnancy is 800ml. Amniotic fluid in the first trimester is mainly the dialysate of maternal serum entering the amniotic cavity through the fetal membrane. Fetal urine is an important source of amniotic fluid after the second trimester.

The function of amniotic fluid is as follows: 1. Protect the fetus from amniotic fluid extrusion and prevent fetal malformation and fetal limb adhesion; Keep the amniotic cavity at constant temperature; Appropriate amniotic fluid can avoid fetal distress caused by direct compression of umbilical cord by uterine muscle wall or fetus; Conducive to fetal body fluid balance. If there is too much water in the fetus, it can be discharged into amniotic fluid by fetal urine. During labor contraction, especially in the early stage of the first labor, amniotic fluid is directly affected by contraction pressure, which can make the pressure evenly distributed and avoid local tire pressure.

2, protect the mother: during pregnancy, amniotic fluid can reduce the discomfort caused by fetal movement to the mother; Amniotic fluid is directly affected by uterine contraction pressure during labor, which can make the pressure evenly distributed and avoid local fetal compression; After labor, the anterior amniotic fluid sac expands the cervix and vagina; Washing vagina with amniotic fluid after rupture of membrane can reduce the chance of infection.