What is the normal range for femur length at 35 weeks of gestation?

Under normal circumstances, the femur length of a fetus at 35 weeks’ gestation falls within the range of 6.19–7.05 cm. A detailed explanation follows:

Fetal femur length refers to the length of the femur (thigh bone) during pregnancy and is typically measured via ultrasound examination. It serves as one of the key indicators used in prenatal assessment of gestational age. By comparing the measured femur length against standardized fetal growth curves, healthcare providers can estimate fetal development status, confirm gestational age, and refine the estimated date of delivery (EDD). At 35 weeks’ gestation, the standard femur length is 6.62 ± 0.43 cm—i.e., 6.19–7.05 cm. If the measured femur length falls within this range, fetal femoral development is considered normal. Conversely, a significantly deviant measurement may suggest intrauterine growth restriction or other developmental abnormalities.

Pregnant women are advised to closely monitor their physical condition. Should symptoms such as irregular abdominal pain or vaginal spotting (“show”) occur, prompt medical evaluation at a hospital is recommended.