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Sonar Measurement of Fetal Crown-Rump Length as Means of Assessing Maturity in First Trimester of Pregnancy
Open accessAbstract
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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“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]
In the citing paper
“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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Does Position and Size of Corpus Luteum Have Any Effect on Nausea of Pregnancy?
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Metadata
- 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
- 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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