Femur length (obstetric ultrasound)
Citation, DOI & article data
Fetal femur length (FL) is one of the basic biometric parameters used to assess fetal size. Femur length together with biparietal diameter, head circumference, and abdominal circumference are computed to produce an estimate of fetal weight. In the second trimester, this may be extrapolated to an estimate of gestational age and an estimated due date (EDD).
Femur length can be used to calculate fetal length, another predictor of fetal growth, with the following equation 3:
Fetal length in centimeters = 6.18 + 0.59 x femur length in millimeters.
- automatic online fetal length calculator based on femur length from www.perinatology.com
- 1. Callen PW. Ultrasonography in Obstetrics and Gynecology. Elsevier Health Sciences. (2011) ISBN:1455726745. Read it at Google Books - Find it at Amazon
- 2. Campbell S, Warsof SL, Little D et-al. Routine ultrasound screening for the prediction of gestational age. Obstet Gynecol. 1985;65 (5): 613-20. - Pubmed citation
- 3. Vintzileos AM, Campbell WA, Neckles S, Pike CL, Nochimson DJ. The ultrasound femur length as a predictor of fetal length. (1984) Obstetrics and gynecology. 64 (6): 779-82. Pubmed