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Online ISSN
1305-3124

Established
1993

Editors-in-Chief
​Cihat Şen, ​Nicola Volpe

Editors
Daniel Rolnik, Mar Gil, Murat Yayla, Oluş Api

Statistics Editor
Resul Arısoy

Contribution of fetal weight estimation in twin pregnancies: a prospective study

Karoui Abir, Dimassi Kawther, Bouriel Ines, Amel Triki, Mohamed Faouzi Gara

Article info

Contribution of fetal weight estimation in twin pregnancies: a prospective study. Perinatal Journal 2014;22(3):SE39 DOI: 10.2399/prn.14.S001084

Author(s) Information

Karoui Abir,
Dimassi Kawther,
Bouriel Ines,
Amel Triki,
Mohamed Faouzi Gara

  1. Department of Obstetrics and Gynecology, Mongi Slim Hospital- La Marsa TN
Correspondence

Karoui Abir, Department of Obstetrics and Gynecology, Mongi Slim Hospital- La Marsa TN,

Publication History
Conflicts of Interest

No conflicts declared.

Introduction
Ultrasonography is an essential tool in the management of twin pregnancies. Fetal weight estimation is useful to anticipate neonatal care in case of prematurity, growth restriction or growth discordance.
Objective 
The aim of this study was to evaluate the accuracy of ultrasound fetal weight prediction in twin pregnancies.
Methods
Fifty patients with an ultrasonography within 4 days before birth were studied. Estimated fetal weight (EFW) was compared with birth weight (BW). Fetal hypotrophyand growthdiscordance superior or equal to 25 % between the first and the second twin were recorded.
Results 
Absolute differences between EFW and BW were similar for both twins (155 g [72–337.5] for T1 and 150g [100–266.5] for T2).
Mean absolute percentage error was 7.7% (2.5-14.76gr) for T1 and7.55% (3.37-11.85gr) for T2.
Mean absolute percentage error was superior to 10% for 20% of T1 and 18% of T2with no significant difference.
Chorionicity, gestational age as well as fetal presentation did not influence fetal weight estimation
T1 correlation coefficient is 0.87; T2 correlation coefficient is 0.89.
PN de J1 = 415,57+ 0,846*PFE de J1
PN de J2 = 65,68+0,963*PFE de J2
Ultrasonography in the diagnosis of hypotrophy had a sensitivity of 90.32%, a specificity of 78.94%, a positive predictive value (PPV) of 83.5% and a negative predictive value (NPV) of 87.5%. For the prediction of growth discordance, sensitivity was 76.9%, specificity 81.8%, PPV 50% and NPV 93.5%.
Conclusion 
Fetal weight can be accurately predicted in twin pregnancies.
The contribution of ultrasonography in the diagnosis of hypotrophyand growth discordance is mainly due to a high NPV.
Keywords

Twin pregnancies; weight estimation