A New Sonographic Weight Formula for Fetuses ≤ 2500 g

Siemer, J.; Hilbert, A.; Hart, N.; Meurer, B.; Goecke, TW; Schild, RL

doi:10.1055/s-2007-963645

Cited by 10 publications

(15 citation statements)

References 17 publications

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“…With respect to Doppler findings, the targeted model of Schild et al 8 (model 29) was still the most accurate model, irrespective of the diastolic flow in the umbilical artery (Table 4). However, the second and third best performing models varied between the 2 subgroups: among fetuses with absent or reversed end‐diastolic flow, these were models I and III of Hadlock et al, 20 whereas among fetuses with forward diastolic flow, these were the 2 targeted models of Siemer et al 10 (model 31) and Scott et al 9 (model 30). When classifying early SGA fetuses based on growth pattern, the most accurate models among fetuses with early SGA and an asymmetric growth pattern were the models I, III, and IV of Hadlock et al 20 By contrast, the best performing models among early SGA fetuses with symmetric growth were 3 targeted models (model 31 of Seimer et al 10 [ P < .001], followed by model 29 of Schild et al 8 and model 30 of Scott et al 9 ).…”

Section: Resultsmentioning

confidence: 99%

“…The second strategy is the development of new sonographic models that are derived from SGA or low‐birth‐weight fetuses, 7 – 11 , 14 assuming that these models and their coefficients will better represent the relationship between the various biometric indices and fetal weight in fetuses affected by SGA. However, whether the use of these new models improves the accuracy of weight estimation in SGA fetuses remains unclear from previous evidence 1 , 7 , 9 , 10 , 13 – 15 . These conflicting results may be attributed to the small sample sizes of some of the studies and the differences in study populations used to derive or validate these models.…”

Section: Discussionmentioning

confidence: 99%

“…The first involves incorporation of sonographic soft tissue measurements such as limb volume into the models. 40 The second strategy is the development of new sonographic models that are derived from SGA or lowbirth-weight fetuses, [7][8][9][10][11]14 assuming that these models and their coefficients will better represent the relationship between the various biometric indices and fetal weight in fetuses affected by SGA. However, whether the use of these new models improves the accuracy of weight estimation in SGA fetuses remains unclear from previous evidence.…”

Section: Discussionmentioning

confidence: 99%

Section: Accuracy Of the Different Models In Different Subgroups Of Ementioning

confidence: 99%

“…To address this concern, several authors developed targeted SGA– or low‐birth‐weight–specific models derived specifically from SGA fetuses or low‐birth weight neonates 7 – 12 . However, whether the use of these models improves the accuracy of fetal weight estimation in SGA fetuses remains controversial 1 , 7 , 9 , 10 , 13 – 15 ; therefore their use in routine clinical practice remains limited. These conflicting data may be secondary to some limitations of the previous validation studies, including small sample sizes, retrospective study designs, and the comparison of only a small number of sonographic models 7 , 9 , 12 – 14 , 16 .…”

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confidence: 99%

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Choice of Formula and Accuracy of Fetal Weight Estimation in Small‐for‐Gestational‐Age Fetuses

Melamed

Ryan

Windrim

et al. 2016

J of Ultrasound Medicine

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Objectives The purpose of this study was to identify the most accurate sonographic models for fetal weight estimation in specific subgroups of small‐for‐gestational‐age (SGA) fetuses. Methods We conducted a retrospective study of women who delivered an SGA neonate and underwent a sonographic estimation of fetal weight within 7 days of delivery in a single tertiary center (n = 370). The accuracy of fetal weight estimation was compared for 33 sonographic models (27 nontargeted and 6 targeted SGA– or low‐birth‐weight–specific models) in specific subgroups of SGA fetuses: early versus late SGA, asymmetric versus symmetric, and presence of Doppler abnormalities. Results A wide variation in the accuracy of the different models was found (systematic error, −12.5% to 15.1%; random error, 7.8% to 15.5%). Most nontargeted models tended to systematically overestimate the weight of SGA fetuses. The best performing model in the overall SGA group was the targeted model of Scott et al (J Ultrasound Med 1996; 15:669–672; systematic error ± random error, −2.8% ± 8.3%). However, the optimal models varied for different subgroups of SGA fetuses, and in most cases the targeted models were the most accurate. An approach that used the optimal model for each subgroup of SGA fetuses compared with the uniform use of the model of Scott et al for all SGA fetuses was associated with a lower systematic error (−0.38% versus −2.8%; P < .001) and a higher proportion of weight estimations within 5%, 10%, and 15% of birth weight (48.4% versus 40.8%; P= .038; 78.6% versus 71.4%; P= .022; 95.1% versus 89.2%; P = .003, respectively). Conclusions Sonographic models in current use for fetal weight estimation in SGA fetuses have significant errors, and their performance varies for specific subgroups of SGA fetuses. An approach that uses subgroup‐specific models may improve the accuracy of weight estimation among SGA fetuses.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Accuracy Of the Different Models In Different Subgroups Of Ementioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Choice of Formula and Accuracy of Fetal Weight Estimation in Small‐for‐Gestational‐Age Fetuses

Melamed

Ryan

Windrim

et al. 2016

J of Ultrasound Medicine

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Optimal caliper placement: manual vs automated methods

Yazdi

Zanker

Wagner

et al. 2013

Ultrasound in Obstet & Gyne

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Ultrasonographic estimation of fetal weight: development of new model and assessment of performance of previous models

Hammami

Zumaeta

Syngelaki

et al. 2018

Ultrasound in Obstet & Gyne

128

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The most accurate models, with the lowest Euclidean distance and highest proportion of AE ≤ 10%, were provided by the formulae incorporating ≥ 3 rather than < 3 biometrical measurements. The systematic review identified 45 studies describing a total of 70 models for EFW by various combinations of measurements of fetal head circumference (HC), biparietal diameter, femur length (FL) and abdominal circumference (AC). The most accurate model with the lowest Euclidean distance and highest proportion of AE ≤ 10% was provided by the formula of Hadlock et al., published in 1985, which incorporated measurements of HC, AC and FL; there was a highly significant linear association between EFW and birth weight (r = 0.959; P < 0.0001), and EFW was within 10% of birth weight in 80% of cases. The performance of the best model developed in this study, utilizing HC, AC and FL, was very similar to that of Hadlock et al. CONCLUSION: Despite many efforts to develop new models for EFW, the one reported in 1985 by Hadlock et al., from measurements of HC, AC and FL, provides the most accurate prediction of birth weight and can be used for assessment of all babies, including those suspected to be either small or large. Copyright © 2018 ISUOG. Published by John Wiley & Sons Ltd.

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A New Sonographic Weight Formula for Fetuses ≤ 2500 g

Abstract: With proper application, our new formula can improve the accuracy of fetal weight estimation.

Cited by 10 publications

References 17 publications

Choice of Formula and Accuracy of Fetal Weight Estimation in Small‐for‐Gestational‐Age Fetuses

Choice of Formula and Accuracy of Fetal Weight Estimation in Small‐for‐Gestational‐Age Fetuses

Optimal caliper placement: manual vs automated methods

Ultrasonographic estimation of fetal weight: development of new model and assessment of performance of previous models

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