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Br Med J. 1973 October 6; 4(5883): 28–31.
PMCID: PMC1587065

Sonar Measurement of Fetal Crown-Rump Length as Means of Assessing Maturity in First Trimester of Pregnancy


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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Selected References

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  • Beazley JM, Underhill RA. Fallacy of the fundal height. Br Med J. 1970 Nov 14;4(5732):404–406. [PMC free article] [PubMed]
  • BELL ET, LORAINE JA. TIME OF OVULATION IN RELATION TO CYCLE LENGTH. Lancet. 1965 May 15;1(7394):1029–1030. [PubMed]
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  • Hellman LM, Kobayashi M, Fillisti L, Lavenhar M, Cromb E. Growth and development of the human fetus prior to the twentieth week of gestation. Am J Obstet Gynecol. 1969 Mar 15;103(6):789–800. [PubMed]
  • Underhill RA, Beazley JM, Campbell S. Comparison of ultrasound cephalometry, radiology, and liquor studies in patients with unknown confinement dates. Br Med J. 1971 Sep 25;3(5777):736–738. [PMC free article] [PubMed]
  • WILLOCKS J, DONALD I, DUGGAN TC, DAY N. FOETAL CEPHALOMETRY BY ULTRASOUND. J Obstet Gynaecol Br Commonw. 1964 Feb;71:11–20. [PubMed]

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