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The crown-rump length in early human pregnancy: a reappraisal |
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| Authors: | R. SCHATS H. C. VAN OS C. A. M. JANSEN J. W. WLADIMIROFF |
| Affiliation: | Department of VEVO/IVF, Academisch Ziekenhuis Vrije Universiteit, de Boelelaan 1117, 1081 HV Amsterdam, The Netherlands;Department of Obstetrics and Gynaecology/IVF, Diaconessenhuis Voorburg, The Netherlands;Department of Obstetrics and Gynaecology, Academic Hospital Dijkzigt, Rotterdam, The Netherlands |
| Abstract: | Summary. The crown-rump length (CRL) was measured by means of transvaginal sonography in 41 pregnancies resulting from in-vitro fertilization (IVF). The embryonic CRL could be determined as early as 25 days after follicle aspiration. A reference chart was constructed relating the CRL to the number of days following follicle aspiration. Comparison with the CRL chart by Robinson & Fleming (1975) currently in use revealed that transvaginal sonography allows earlier and more accurate measurement of embryonic CRL. |
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