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Bmus fetal size and dating

To achieve this we conducted a retrospective cross-sectional study at the obstetrics unit of our institution.First trimester sonographic dating formula for the Nigerian obstetric population.West Afr J Radiol [serial online] 2012 [cited 2016 Nov 9];19:1-4. 2012/19/1/1/112515Sonographic measurement of fetal biometry using crown-rump length (CRL) has become a reliable tool for dating pregnancies in the first trimester and also for determination of the prognosis of pregnancy in the first trimester.It has been shown that ethnicity has a significant influence on fetal biometry, the published CRL dating formulae are derived predominantly from Caucasian population and may not be applicable in our environment.The study was a two-stage procedure; the first stage was to develop a formula establishing a local reference for GA (in weeks) and the CRL (in mm).

The mean prediction error was 0.13 for our formula, and 0.16 and 0.20 for Nelson's, and Robinson's formulae, respectively.Conclusion: Our dating formula locally derived was more favorably applicable for the Nigerian population.Objective: The main purpose of this study is to derive a dating formula for the Nigerian obstetric population, quantify its prediction error, and compare its performance with existing published formulae.Materials and Methods: The crown-rump length (CRL) of 322 fetuses without risk for fetal growth restriction were plotted against menstrual age to obtain a scatter plot from which we derived the best-fit fractional polynomial regression model for estimating gestational age (GA).This has implication for prenatal diagnosis in Nigeria.

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Keywords: Crown-rump length; dating; gestational age How to cite this URL: Oboro VO, Bello TO, Oyeniran AO.

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