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VOLUME 4 , ISSUE 2 ( April-June, 2018 ) > List of Articles

ORIGINAL ARTICLE

Correlation of Predicted Birth Weight at 20–24 Weeks of Gestational Age using the Formula devised by Chi-Feng Su to Actual Birth Weight

Nagendra Prasad, Rangaiah Nagaratnamma, N Nagendra Prasad, MoOrkoth PA Sailakshmi

Keywords : Actual birth weight, Body mass index, Estimated fetal weight

DOI: 10.5005/jp-journals-10045-0081

License: NA

Published Online: 01-10-2018

Copyright Statement:  NA


Abstract

Aim: The aim of the study is to use the formula demonstrated by Chi-Feng Su to determine the estimated birth weight (EBW) at 20–24 weeks gestation and try to find out the correlation between the estimated fetal weight with the actual birth weight in our local population. Materials and methods: It is a retrospective study done at the Department of Obstetrics and Gynecology, RajaRajeswari Medical College, Bengaluru. Fifty patients who were booked, followed up, and delivered at our institution were selected for our study after meeting inclusion and exclusion criteria. Participant's demographic characters like age, gravida, weight, body mass index (BMI), last menstrual period (LMP), and others were noted down as per the protocol. Their mid-pregnancy BMI, and fetal biometry report at 20–24 weeks were noted. Using the study formula, their anticipated fetal weight was calculated. After delivery, the exact birth weight was noted and was correlated with the predicted weight. Results: In the study, majority (66%) aged less than 25 years and only 3 patients were aged above 30 years; 50% of the cases were second gravida; 60% of the participants had BMI between 20 and 25, 16% has BMI above 25, and 24% has BMI less than 20. The best correlation was seen in the weight group between 2.6 and 3.5 kg. Conclusion: The formula demonstrated by Chi-Feng Su had variance as high as 0.303. Our study also showed high variability when the error was +17.6% with birth weight >2.5 kg.


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  1. Kurmanavicius J, Burkhardt T, Wisser J, Huch R. Ultrasonographic fetal weight estimation: accuracy of formulas and accuracy of examiners by birth weight from 500 to 5000 g. J Perinat Med 2004;32(2):155-161.
  2. ACOG Practice bulletin no. 134: fetal growth restriction. Obstet gynecol 2013 May;121(5):1122-1133.
  3. Unterscheider J, Daly S, Geary MP, Kennelly MM, McAuliffe FM, O'Donoghue K, Hunter A, Morrison JJ, Burke G, Dicker P, et al. Optimizing the definition of intrauterine growth restriction: the multicenter prospective PORTO study. Am J Obstet Gynecol 2013 Apr;208(4):290e.1-290e.6.
  4. Anderson NH, Sadler LC, Stewart AW, McCowan LM. Maternal and pathological pregnancy characteristics in customised birth weight centiles and identification of at-risk small-for-gestational-age infants: a retrospective cohort study. BJOG 2012 Jun;119(7):848-856.
  5. Ben-Haroush A, Yogev Y, Hod M. Predictive value of a single early fetal weight estimate in normal pregnancies. Eur J Obstet Gynecol Reprod Biol 2007 Feb;130(2):187-192.
  6. Yoshida SH, Unno N, Kagawa H, Shinozuka N, Kozuma S, Taketani Y. Sonographic determination of fetal size from 20 weeks of gestation onward correlates with birth weight. J Obstet Gynecol Res 2001 Aug;27(4):205-211.
  7. Honarvar M, Allahhyari M, Dehbashi S. Assessment of fetal weight based on ultrasonic femur length after the second trimester. Int J Gynaecol Obstet 2001 Apr;73(1):15-20.
  8. Su CF, Tsai HJ, Lin CY, Ying TH, Wang PH, Chen GD. Prediction of newborn birth weight based on the estimation at 20–24 weeks of gestation. Taiwan J Obstet Gynecol 2010 Sep;49(3):285-290.
  9. Chien PF, Owen P, Khan KS. Validity of ultrasound estimation of fetal weight. Obstet Gynecol 2000 Jun;95(6 Pt 1):856-860.
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