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Obstetrics and Gynecology International
Volume 2013 (2013), Article ID 708126, 9 pages
http://dx.doi.org/10.1155/2013/708126
Review Article

Intrauterine Growth Restriction: Effects of Physiological Fetal Growth Determinants on Diagnosis

1Department of Obstetrics and Gynecology, Haukeland University Hospital, 5021 Bergen, Norway
2Department of Anesthesia and Intensive Care, Haukeland University Hospital, 5021 Bergen, Norway
3Department of Obstetrics and Gynecology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, USA

Received 18 February 2013; Accepted 25 March 2013

Academic Editor: J. C. Morrison

Copyright © 2013 Kjell Haram et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The growth of the fetus, which is strongly associated with the outcome of pregnancy, reflects interplay of several physiological and pathological factors. The assessment of fetal growth is based on comparison of birthweight (BW) or estimated fetal weight (EFW) to standards which define reference ranges at a spectrum of gestational ages. Most birthweight standards do not take into account effects of physiological determinants of fetal growth. Additionally, gestational age in many standards is based on the menstrual history and is often inaccurate. Fetal growth norms should be based on an early ultrasound estimate of gestational age. Customized standards, which have included only ultrasound-dated pregnancies, seem to be superior to population-based birthweight norms in predicting perinatal mortality and morbidity. Adjustment for individual variation in customized growth curves reduces false-positive diagnosis of IUGR and may lead to a very significant reduction in intervention for suspected IUGR. Customized growth potential identifies better the risk for adverse outcome than the currently used national standards, but customized charts may fail in detecting growth-restricted stillbirth. An individual’s birthweight is the sum of physiological and pathological influences operating during pregnancy. Growth potential norms are a better discriminator of aberrations of fetal growth than population, ultrasound, and customized norms.