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01-07-2015 | Maternal-Fetal Medicine

Sonographic weight estimation in fetal macrosomia: influence of the time interval between estimation and delivery

Authors: F. Faschingbauer, U. Dammer, E. Raabe, M. Schneider, C. Faschingbauer, M. Schmid, A. Mayr, R. L. Schild, M. W. Beckmann, S. Kehl

Published in: Archives of Gynecology and Obstetrics | Issue 1/2015

Abstract

Purpose

To evaluate the influence of the time interval between examination and delivery on the accuracy of sonographic weight estimation (WE) in fetal macrosomia.

Materials and methods

896 singleton pregnancies (birth weight > 4,000 g) with a total of 1,281 sonographic weight estimations were included in this retrospective cohort study. Fetuses were divided into six groups with regard to the time interval between estimation and delivery: group 1: scan-to-delivery interval: 0 days; group 2: scan-to-delivery interval: 1–3 days; group 3: scan-to-delivery interval: 4–7 days; group 4: scan-to-delivery interval: 8–14 days; group 5: scan-to-delivery interval: 15–21 days; group 6: scan-to-delivery interval: 22–42 days. The accuracy of WE was compared between five commonly used formulas using means of percentage errors (MPE), random error, medians of absolute percentage errors (MAPE), and proportions of estimates within 10 % of actual birth weight.

Results

Significant differences were found between the time interval groups with regard to MAPE and MPE values (p < 0.001). All formulas showed a systematic underestimation of fetal weight (negative MPEs) (p < 0.05). MPE values were closest to zero in time interval group 1 and 2. From group 3 to 6, a continuous decrease was observed. The lowest MAPE was found with the Merz formula in group 1 and 2. Values increased continuously from group 3 to 6. Differences between time interval group one and three did not reach statistical significance.

Conclusions

WE in fetal macrosomia shows the best results when examinations are performed within 7 days before delivery, using the formula of Merz et al. Accuracy significantly decreases after this time period.

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Title: Sonographic weight estimation in fetal macrosomia: influence of the time interval between estimation and delivery
Authors: F. Faschingbauer
U. Dammer
E. Raabe
M. Schneider
C. Faschingbauer
M. Schmid
A. Mayr
R. L. Schild
M. W. Beckmann
S. Kehl
Publication date: 01-07-2015
Publisher: Springer Berlin Heidelberg
Published in: Archives of Gynecology and Obstetrics / Issue 1/2015
Print ISSN: 0932-0067
Electronic ISSN: 1432-0711
DOI: https://doi.org/10.1007/s00404-014-3604-y

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Sonographic weight estimation in fetal macrosomia: influence of the time interval between estimation and delivery

Abstract

Purpose

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusions

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