Sonar measurement of fetal crown-rump length as means of assessing maturity in first trimester of pregnancy

Robinson, H. P.

doi:10.1136/bmj.4.5883.28

Cited by 392Prenatal Screening and DiagnosticsMaternal and Perinatal Health InterventionsUltrasound in Clinical Applications

Sonar measurement of fetal crown-rump length as means of assessing maturity in first trimester of pregnancy

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Robinson, H. P.·1973·BMJ

DOI 10.1136/bmj.4.5883.28PMC PMC1587065

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Abstract

A method is reported by which the "in utero" crown-rump length of the fetus may be determined by sonar in the first trimester of pregnancy. The accuracy of the technique was assessed by comparing the sonar and the direct postabortum measurements of fetuses in cases of missed abortion. A normal curve of fetal crown-rump length was derived from 214 examinations on 80 patients and by using these values in a further "blind" series it was found possible to predict the maturity of pregnancy to within three days, between the sixth and the 14th weeks of pregnancy.

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The AWMF, ISUOG and SOGC consider crown-rump length to be the most accurate method for determining gestational age in spontaneously conceived pregnancies.
“More specifically, the AIUM and ASUM base their antenatal care on the date of the last menstrual period (LMP), while the AWMF, ISUOG and SOGC consider the crown–rump length (CRL) to be the most accurate method for determining gestational age in spontaneously conceived pregnancies [20].”
From First-Trimester Ultrasound: A Comparative Review of Guidelines (2026) · cites this paper as [20]
The AIUM and ASUM base their antenatal care on the date of the last menstrual period.
“More specifically, the AIUM and ASUM base their antenatal care on the date of the last menstrual period (LMP), while the AWMF, ISUOG and SOGC consider the crown–rump length (CRL) to be the most accurate method for determining gestational age in spontaneously conceived pregnancies [20].”
From First-Trimester Ultrasound: A Comparative Review of Guidelines (2026) · cites this paper as [20]

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Estimation of pregnancy duration by means of ultrasonic measurements of the fetal crown—rump length
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Authors: Robinson, H. P.
Affiliations: University of Glasgow (GB)
Corresponding author: Robinson, H. P.
Venue: BMJ
Publisher: BMJ
Published: 1973-10-06
Volume: 4
Issue: 5883
Pages: 28-31
ISSN: 0007-1447 (ISSN-L)
0959-8138
1468-5833
DOI: 10.1136/bmj.4.5883.28
PMC: PMC1587065
OpenAlex: W1995527832
Cited by: 392
References: 10
Citations by year: 2026: 6 · 2025: 6 · 2024: 7 · 2023: 5 · 2022: 12 · 2021: 13 · 2020: 9 · 2019: 8 · 2018: 12 · 2017: 12 · 2016: 14 · 2015: 11 · 2014: 11 · 2013: 10 · 2012: 10
FWCI: 19.78
Type: journal article
Language: en
Open access: bronze
doi.org
Locations: BMJ (publishedVersion)
Europe PMC (PubMed Central) (publishedVersion)
PubMed (publishedVersion)
HighWire Press Open Archive (submittedVersion)
Funders: University of Glasgow
Medical Research Council
Topics: Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Screening and Diagnostics
Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Ultrasound in Clinical Applications
Keywords: crown-rump length, fetal growth, first trimester, fetal maturity, sonar measurements, missed abortion, gestational age estimation
MeSH terms: Body Height, Female, Fetus, Gestational Age, Humans, Methods, Photography, Pregnancy, Ultrasonography

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Sonar measurement of fetal crown-rump length as means of assessing maturity in first trimester of pregnancy

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