Femur length (obstetric ultrasound)
Last revised by Dr Jeremy Jones ◉ on 20 Sep 2021
Citation, DOI and article data
Citation:
Stanislavsky, A., Jones, J. Femur length (obstetric ultrasound). Reference article, Radiopaedia.org. (accessed on 22 Oct 2021) https://doi.org/10.53347/rID-26433
Permalink:
rID:
26433
Article created:
21 Dec 2013 by Dr Alexandra Stanislavsky ◉
Revisions:
11 times by 5 users - see full revision history
System:
Section:
Synonyms:
- Femur length
- Femur diaphysis length
- Femoral lengths
- Femoral length
- Femur length (FL)
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.
See also
- automatic online fetal length calculator based on femur length from www.perinatology.com
References
- 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
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