The measurement confirms the head’s measurement and the best value can be obtained after 14 weeks. Among the markers used for assessing fetal growth and health is the length of the baby's femur, the long bone in the thigh. Femur length (FL) measurements may be used to accurately predict gestational age between 14 weeks' gestation and term . So your doctor will check your baby’s head circumference (HC), abdominal circumference (AC) and thigh bone (femur) length (FL). ... (CM) were measured in the suboccipitobregmatic plane of the head. ... what should my baby s femur length of 31 weeks? according to my doctor it’s also one of the harder measurements to take. Femur Length Measurement . The foetal femoral length growth presents a characteristic appearance between the 12th and 42nd pregnancy week. For each 7-day interval from 14 to 40 weeks, 40 patients were included. After the first trimester of pregnancy a multiparameter assessment of gestational age is advocated. 3, 10 – 17 Reference range data for femur diaphysis length at 19 to 22 menstrual weeks from our study and 2 other studies 10, 11 are shown in Table 3. Many studies of different populations and races have been conducted to determine normal ranges for femur and humerus diaphysis length. Skeletal dysplasias tends to affect it but this condition is very rare. scan are both normal however femur length is below the 5th percentile. Measured from the blunt end of the bone to the shaft, the femur length is generally measured in millimeters. In the 12th pregnancy week it is 11 mm on the average, 33 m in the 20th, 58 mm in the 30th, and 76 mm at birth. It increases from about 1.5 cm at 14 weeks to about 7.8 cm at term. The growth function of the foetal femoral length was determined via a polynomic regression equation. My baby’s femur length was 1 week behind at 16 weeks but by 24 it had corrected itself. 39 Most observers consider the accuracy of the FL and BPD measurements to be similar in the third trimester. The femur length (FL) was measured from the greater trochanter to the lateral condyle. This should include at least two fetal measurements (usually biparietal diameter (BPD) and femur length (FL)) plus a consideration of additional parameters such as head circumference (HC), occipitofrontal diameter (OFD), abdominal circumference (AC) and humerus length (HL). The regression equations generated between fetal femur growth and week of gestation in our study were as follows: mean femur length = −33.26 + 3.489w − 0.000482w 3, and SD = 1.065 + 0.04906w, where w is exact gestational age in weeks. Femur and Humerus Length. To keep things simple, our chart uses head to bottom length (CRL) from eight weeks to 19 weeks, and then crown-to-heel measurements until birth. 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