| Intra- and interobserver variability in fetal ultrasound measurements. | |
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MedLine Citation:
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PMID: 22535628 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE: To assess intra- and interobserver variability of fetal biometry measurements throughout pregnancy. METHODS: A total of 175 scans (of 140 fetuses) were prospectively performed at 14-41 weeks of gestation ensuring an even distribution throughout gestation. From among three experienced sonographers, a pair of observers independently acquired a duplicate set of seven standard measurements for each fetus. Differences between and within observers were expressed in measurement units (mm), as a percentage of fetal dimensions and as gestational age-specific Z-scores. For all comparisons, Bland-Altman plots were used to quantify limits of agreement. RESULTS: When using measurement units (mm) to express differences, both intra- and interobserver variability increased with gestational age. However, when measurement of variability took into account the increasing fetal size and was expressed as a percentage or Z-score, it remained constant throughout gestation. When expressed as a percentage or Z-score, the 95% limits of agreement for intraobserver difference for head circumference (HC) were ± 3.0% or 0.67; they were ± 5.3% or 0.90 and ± 6.6% or 0.94 for abdominal circumference (AC) and femur length (FL), respectively. The corresponding values for interobserver differences were ± 4.9% or 0.99 for HC, ± 8.8% or 1.35 for AC and ± 11.1% or 1.43 for FL. CONCLUSIONS: Although intra- and interobserver variability increases with advancing gestation when expressed in millimeters, both are constant as a percentage of the fetal dimensions or when reported as a Z-score. Thus, measurement variability should be considered when interpreting fetal growth rates. Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd. |
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Authors:
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I Sarris; C Ioannou; P Chamberlain; E Ohuma; F Roseman; L Hoch; D G Altman; A T Papageorghiou; |
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Publication Detail:
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Type: JOURNAL ARTICLE |
Journal Detail:
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Title: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology Volume: 39 ISSN: 1469-0705 ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-4-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9108340 Medline TA: Ultrasound Obstet Gynecol Country: - |
Other Details:
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Languages: ENG Pagination: 266-273 Citation Subset: - |
Copyright Information:
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Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd. |
Affiliation:
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Oxford Maternal and Perinatal Health Institute (OMPHI), Green Templeton College and Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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