Is a femur length of 39 mm considered long legs?

Oct 09, 2023 Source: Cainiu Health

Dr. Wang Jianjun

Introduction

Femur length usually refers to the length of the fetal thigh bone. Measurement of femur length is part of obstetric ultrasound examination and can help assess whether the fetus has a risk of intrauterine growth restriction. Femur length may vary depending on gestational age. Generally, the normal range of fetal femur length between 20 and 28 weeks of gestation is 33.5 mm to 74.0 mm.

In general, a femur length of 39 mm is considered normal during the second trimester and cannot be used to determine whether the fetus has long legs. Specific details are as follows:

The femur length usually refers to the length of the fetal thigh bone. Measurement of femur length is part of obstetric ultrasound examinations, which can help assess whether there is a risk of intrauterine growth restriction. Femur length may vary depending on gestational age. Generally, the normal range for fetal femur length between 20 and 28 weeks of gestation is 33.5 mm to 74.0 mm. A femur length of 39 mm falls within the normal range at around 22 weeks of gestation (38.2 mm ± 4.7 mm), indicating that the fetal femur development is normal. However, this measurement alone is not a basis for determining whether the fetus will have long legs. Fetal femur length is generally influenced by genetic factors, diet, and other elements. If a pregnant woman frequently exhibits picky eating habits or experiences nutritional imbalances during pregnancy, it may lead to malnutrition and result in fetal growth restriction. Pregnant women are advised to get adequate rest, maintain a positive mood, eat a balanced diet, and ensure sufficient nutrition. It is also recommended that they attend regular prenatal checkups at the hospital as directed by their doctor to monitor fetal development.

If any physical discomfort occurs, prompt medical consultation is advised, along with standardized treatment under a physician's guidance, which may support a healthy pregnancy outcome.

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