Fetal femur length standard value comparison table

Many people are not particularly familiar with the femoral length of the fetus. In fact, the femoral length refers to the length of the femur of the thigh. The thigh bone is the longest in the human body. The femur and humerus are the most typical long tubular bones in the human body. The femur length is checked by B-ultrasound or color ultrasound. For pregnant women, during prenatal examinations, this parameter can be used to see whether the child's development is normal. Let us learn about this aspect below.

Femur length standard

The standard value of femur length is generally calculated from the 13th week of pregnancy, because the early pregnancy (1-12 weeks of pregnancy) is the process from the beginning of implantation of the fertilized egg to the initial development of the fetal reproductive organs, after which the various organs tend to be perfected. Therefore, it is recommended to start checking the femur length from 13 weeks. Next, let’s take a look at the femoral length standards for fetuses at different gestational weeks, as well as the biparietal diameter and abdominal circumference standards related to the fetus.

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What to do if the femur is too short

Femur length is just a measurement, and different people measure in different locations, so there will be a little difference. Under normal circumstances, the reason why the femur is shorter is sometimes related to measurement, sometimes to genetic factors, and sometimes to nutrition.

Causes and measures for short femur length:

1. Measurement errors: When measuring the femur length after 30 weeks of pregnancy, an error of up or down two weeks is allowed. As long as it is within this range, pregnant mothers do not need to worry too much.

2. Fetal maldevelopment: If the femur length measurement is very different from the standard value, it is very likely that the fetus is maldeveloped. Pregnant women should monitor the health of their babies and themselves. If they have irregular abdominal pain, spotting, etc., they should go to the hospital for examination in time.

3. Congenital femoral length: Some fetuses have congenital femoral length differences due to genetic factors. Experts say that congenital femur length will affect the height of the baby at birth, but this situation can be changed. Now the baby's acquired nutrition has far exceeded the influence of congenital factors. Therefore, after the baby is born, try to let him drink more milk, supplement more calcium, and strengthen physical exercise, which is very helpful for the baby's height.

4. Calcium deficiency: Calcium deficiency during pregnancy may affect the length of the femur. Pregnant women are advised to supplement calcium and high-quality protein appropriately, and eat more calcium-rich foods in their diet, such as milk, lean meat, bone soup, etc. In addition, pregnant women should get more sun exposure to facilitate calcium absorption.