Should a first trimester dating scan be routine for all pregnancies?

Abstract Accurate pregnancy dating is important for diagnostic and management decisions during pregnancy. Dating by last menstrual period is less reliable than dating by ultrasound, since the former has memory-related and other sources of inaccuracy. Dating by first trimester ultrasound, via the cro...

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Bibliographic Details
Published in:Seminars in perinatology 2013-10, Vol.37 (5), p.307-309
Main Author: Doubilet, Peter M., MD, PhD
Format: Article
Language:English
Subjects:
Female
Fetal Development
First trimester
Gestational Age
Humans
Last menstrual period
Neonatal and Perinatal Medicine
Predictive Value of Tests
Pregnancy
Pregnancy Trimester, First
Pregnancy Trimester, Second
Reproducibility of Results
Second trimester
Ultrasonography, Prenatal - methods
Ultrasonography, Prenatal - standards
Ultrasound
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Summary:Abstract Accurate pregnancy dating is important for diagnostic and management decisions during pregnancy. Dating by last menstrual period is less reliable than dating by ultrasound, since the former has memory-related and other sources of inaccuracy. Dating by first trimester ultrasound, via the crown-rump length, has a 95% confidence range of ±5 days, slightly better than the ±8 days for dating by second trimester ultrasound at 14–20 weeks. This small difference appears to be too small to justify a routine first trimester scan for the purpose of dating the pregnancy.
ISSN:0146-0005
1558-075X
DOI:10.1053/j.semperi.2013.06.006