Sonographic estimation of foetal weight versus actual birth weight at term

Authors

  • Akinshola A. Ero-Phillips Department of Radiology, Lagos State University Teaching Hospital, Lagos, Ikeja, Nigeria
  • Faosat O. Jinadu Department of Radiology, Lagos State University Teaching Hospital, Lagos, Ikeja, Nigeria
  • Abimbola T. Ottun Department of Obstetrics and Gynaecology, Lagos State University Teaching Hospital, Lagos, Ikeja, Nigeria
  • Ayokunle M. Olumodeji Department of Obstetrics and Gynaecology, Lagos State University Teaching Hospital, Lagos, Ikeja, Nigeria

DOI:

https://doi.org/10.18203/2320-1770.ijrcog20211491

Keywords:

Birth-weight, Foetal weight, Ultrasound estimated foetal weight

Abstract

Background: Estimated foetal weight is very critical to decision making in the management of pregnant women. It is therefore important to evaluate the accuracy of ultrasound estimated foetal weight (USEFW) at term in our environment. We compared ultrasound estimated foetal weight at term with the actual foetal birth weight at delivery.

Methods: This was a prospective, comparative cross-sectional study at the Lagos State University Teaching Hospital over a 6-month period. Four hundred and five pregnant women with normal singleton pregnancy, who had sonographic estimation of foetal weight at term, using the Hadlock IV formula, were followed up and had their actual birth weight (ABW) determined at delivery. Accuracy was determined by proportion of estimates within 10% of actual birth weight and mean absolute percentage error (MAPE). The p<0.05 was considered significant at 95% confidence interval.

Results: The prevalence of macrosomia was 10.3%. At 10% margin of error, ultrasound accurately estimated the weights of 73.3% of babies. The mean USEFW was 3559.89±316.9g and mean ABW was 3477.42±422.9g with a mean difference of 82.44g (p<0.001) and MAPE of 7.11. There was positive correlation (r=0.669) between the EFW and ABW (p<0.001). The USEFW had a sensitivity of 66.7%, specificity of 91.5%, positive predictive value of 47.5% and negative predictive value of 96.0% in predicting macrosomia.

Conclusions: Ultrasound estimation of foetal weight at term is reliably accurate in predicting actual birth weight in south-western Nigeria.

 

References

Ugwu EO, Udealor PC, Dim CC, Obi SN, Ozumba BC, Okeke DO, et al. Accuracy of clinical and ultrasound estimation of foetal weight in predicting actual birth weight in Enugu, S Eastern Nigeria. Niger J clin pract. 2014;17(3):270-275.

Titapant V, Chawanpaiboon S, Mingmipatanakul KA. Comparison of clinical and ultrasound estimation of foetal weight. J Med Associ Thai. 2001;84:1251-7.

Diejomaoh FM. Perinatal and maternal mortality; In: Text book of obstetrics and gynaecology for medical student, Agboola A, editors. Volume 2, Lagos: University Services Educational Publishers, Lagos, Nigeria, First Edition, 1988;304-14.

Suleiman MB, Mokuolu OA. Perinatal Mortality in a Northwestern Nigerian City: A Wake up Call. Front Pediatr. 2014;2:105.

Nwokoro UU, Dahiru T, Olorukooba A, Daam CK, Waziri HS, Adebowale A et al. Determinants of perinatal mortality in public secondary health facilities, Abuja Municipal Area Council, Federal Capital Territory, Abuja, Nigeria. Pan African Medical Journal. 2020;37:114.

Fasubaa OB, Faleyimu BL, Ogunniyi SO. Perinatal outcome of macrosomic babies. Nig J Med.1991;1:61-2.

Peregrine E, O'Brien P, Jauniaux E. Clinical and ultrasound estimation of birth weight prior to induction of labor at term. Ultrasound Obstet Gynecol. 2007;29(3):304-9.

Shittu AS, Kuti O, Orji EO. Clinical versus sonographic estimation of foetal weight in southwest Nigeria. J Health Popul Nutr. 2007;25(1):14-23.

Esinler D, Bircan O, Esin S, Sahin EG, Kandemir O, Yalvac S. Finding the best formula to predict the fetal weight: comparison of 18 formulas. Gynecol Obstet Invest. 2015;80(2):78-84.

Hadlock FP, Harrist RB, Martinez-Poyer J. In utero analysis of fetal growth: a sonographic weight standard. Radiology. 1991;181:129-133.

Hadlock FP, Deter RL, Harrist RB, Park SK. Fetal biparietal diameter: rational choice of plane of section for sonographic measurement. AJR Am J Roentgenol. 1982;138:871-874.

Hadlock FP, Deter RL, Harrist RB, Park SK. Fetal abdominal circumference as a predictor of menstrual age. AJR Am J Roentgenol. 1982;139:367-370.

Jeanty P, Kirkpatrick C, Dramaix-Wilmet M, Struyven J. Ultrasonic evaluation of fetal limb growth. Radiology. 1981;140:165-168.

Iyoke CA, Lawani OL, Ugwu GO, Ezugwu FO, Uchechukwu GC. Yearly trends in foetal microsomia among hospital births in Enugu, South-East Nigeria. American journal of clinical medicine Research. 2014; 79-83.

Mai A H, Abbasia D. The Prevalence of Foetal Macrosomia at the Specialised Hospital of Gynaecology and Obstetrics in Sidi Bel Abbes (West of Algeria). Journal of Food Nutrition and Food sciences. 4:272.

Ashrafgan J T, Naderi T, Eshrati B, Babapoor N. Accuracy of Ultrasound, Clinical and maternal estimates of Birth weight in Term women At Kerman, Islamic Republic of Iran. Eastern Mediterranean Health Journal. 2010;16:313-317.

Abudu OO, Awonuga AO. Foetal macrosomia and pregnancy outcome in Lagos. International journal of gynaecology and obstetrics. 1989;28(3):257-262.

Kanamu C I, Onwere S, Chigbu B. Foetal Macrosomia in African Women, a Study of 249 Cases. Arch. Gynecol Obstet. 2009;279(857).

Abena OM , Shasha VW, Fodjo I, Bonongkaho F, Mbede I, Kamdom M I. Foetal Macrosomia In Cameroun: Prevalence, Risk Factors and Complications. W Afr J of Med. 1995;14(4):249-254.

Yau PK, Sin WK, Lee HC, Au-Yeung KC. Accuracy of ultrasound estimation of foetal weight by Obstetrics and Gynaecology residents and maternal-foetal medicine sub specialist. Hong Kong J Gynaecol Obstet Midwifery. 2013;13(1):27-32.

Predanic M, Cho A, Ingrid F. Ultrasonographic estimation of foetal weight-Acquiring accuracy in Residency. J Ultrasound Med. 2002;21:495-500.

Njoku CU, Emechebe CE, Odusolu PU, Abeshi SI, Chukwu CU, Ekabua JA. Determination of accuracy of foetal weight using ultrasound and clinical foetal weight estimations in Calabar, South-South, Nigeria. International Scholarly Research Notices. 2014;2014.

Colman A, Dushyant M, Hutton J, Tuohy J. Reliability of Ultrasound Estimated Foetal Weight in singleton Pregnancies. N Z Med J. 2006;119(2141):1211.

Benacerraf BR, Gelman R, Frigoletto jr FD. Sonographically Estimated Foetal Weights: Accuracy and Limitation. Am J Obstet Gynaecol. 1998;159(5):1118-1121.

Harlev A, Walfisch A, Bar-David J, Hershkovitz R, Friger M, Hallaak M. Maternal Estimation of Foetal Weight as a Complementary Method of foetal weight assessment: A Prospective clinical Trial. J Reprod Med. 2006;51(7):515-520.

Bajracharya J, Shrestha NS, Karli C. Accuracy of prediction of birth weight by foetal ultrasound. Kathmandu Univ Med J. 2012;38 (2):74-76.

Japarath P, Wiboolphan T. Comparison of the accuracy of foetal weight estimation using clinical and sonographic methods. J Med Assoc Thai. 2004;87(3):1-7.

Bakshi L, Begum H A, Khan I, Dey S K, Habib A, Barman K K. Comparative study of clinical and sonographic Estimation of Foetal weight at Term. Mymensingh medical journal. 2015;24(3):572-577.

Sarmandal P, Bailey SM, Grant JM. A comparison of three methods of assessing inter-observer variation applied to ultrasonic foetal measurement in third trimester. Br J Obstet Gynaecol. 1989;(96):1261-1265.

Sekar R, Khatun M, Barrett H L, Domcombe G, A Prospective Pilot Study in Assessing the Accuracy of Ultrasound Estimated Foetal Weight Prior to Delivery. ANZJOG. 2016;56(1):49-53.

Yao S, Weixiu Z, JIan H, Fansun L. Accuracy of Sonographic Foetal Weight Estimation Prior to Delivery in a Chinese Han Population. Journal of Clinical Ultrasound. 2017;45(8):465-471.

Noumi G, Collado-Khoury F, Bombard A, Julliard K, Weiner Z. Clinical and Sonographic Estimation of Fetal weight performed during labour by residents. AJOG. 2004;192(5):1407-1409.

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Published

2021-04-23

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Original Research Articles