Femur length (obstetric ultrasound)
Updates to Article Attributes
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 centimeterscentimetres = 6.18 + 0.59 x femur length in millimetersmillimetres.
Measurement criteria:
1) Measure with transducer aligned along the long axis of bone - perpendicular to shaft.
2)Measured ends : Blunt and not pointed.
3) Blunt end of proximal femoral epiphysis to blunt end of distal femoral epiphysis are measured parallel to shaft.
4) Post 32-34 weeks : Distal femoral epiphysis visualised. However not included in measurements.
5) excessive bowing, demineralisation or sortemed length : are exclusion criteria for assesment of gestational age.
See also
automatic online fetal length calculator based on femur length from www.perinatology.com
-<p>Fetal<strong> femur length (FL)</strong> is one of the basic <a href="/articles/fetal-biometric-parameters">biometric parameters</a> used to assess fetal size. Femur length together with <a href="/articles/biparietal-diameter">biparietal diameter</a>, <a href="/articles/head-circumference">head circumference</a>, and <a href="/articles/fetal-abdominal-circumference">abdominal circumference</a> 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).</p><p>Femur length can be used to calculate fetal length, another predictor of fetal growth, with the following equation <sup>3</sup>: </p><p>Fetal length in centimeters = 6.18 + 0.59 x femur length in millimeters.</p><h4>See also</h4><ul><li>automatic online fetal length <a href="http://perinatology.com/calculators/Fetal%20length.htm">calculator</a> based on femur length from <strong>www.perinatology.com</strong>-</li></ul>- +<p>Fetal<strong> femur length (FL)</strong> is one of the basic <a href="/articles/fetal-biometric-parameters">biometric parameters</a> used to assess fetal size. Femur length together with <a href="/articles/biparietal-diameter">biparietal diameter</a>, <a href="/articles/head-circumference">head circumference</a>, and <a href="/articles/fetal-abdominal-circumference">abdominal circumference</a> 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).</p><p>Femur length can be used to calculate fetal length, another predictor of fetal growth, with the following equation <sup>3</sup>: </p><p>Fetal length in centimetres = 6.18 + 0.59 x femur length in millimetres.</p><p>Measurement criteria:</p><p>1) Measure with transducer aligned along the long axis of bone - perpendicular to shaft.</p><p>2)Measured ends : Blunt and not pointed. </p><p>3) Blunt end of proximal femoral epiphysis to blunt end of distal femoral epiphysis are measured parallel to shaft. </p><p>4) Post 32-34 weeks : Distal femoral epiphysis visualised. However not included in measurements. </p><p>5) excessive bowing, demineralisation or sortemed length : are exclusion criteria for assesment of gestational age. </p><h4>See also</h4><ul><li><p>automatic online fetal length <a href="http://perinatology.com/calculators/Fetal%20length.htm">calculator</a> based on femur length from <strong>www.perinatology.com</strong></p></li></ul>
References changed:
- 1. Peter W. Callen. Ultrasonography in Obstetrics and Gynecology E-Book. (2011) ISBN: 9781455726745 - <a href="http://books.google.com/books?vid=ISBN9781455726745">Google Books</a>
- 1. Peter W. Callen. Ultrasonography in Obstetrics and Gynecology E-Book. (2011) ISBN: 9781455726745 - <a href="http://books.google.com/books?vid=ISBN9781455726745">Google Books</a>
- 1. Callen PW. Ultrasonography in Obstetrics and Gynecology. Elsevier Health Sciences. (2011) ISBN:1455726745. <a href="http://books.google.com/books?vid=ISBN1455726745">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/1455726745?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1455726745">Find it at Amazon</a><div class="ref_v2"></div>
- 1. Callen PW. Ultrasonography in Obstetrics and Gynecology. Elsevier Health Sciences. (2011) ISBN:1455726745. <a href="http://books.google.com/books?vid=ISBN1455726745">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/1455726745?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1455726745">Find it at Amazon</a><div class="ref_v2"></div> Fetalultrasound.com/online/text/3-008.htm
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