The assessment of prenatal age from the crown‐rump length determined ultrasonically
- 1 April 1977
- journal article
- research article
- Published by Wiley in Journal of Anatomy
- Vol. 148 (4), 555-560
- https://doi.org/10.1002/aja.1001480410
Abstract
Crown-rump lengths determined ultrasonically in vivo and in utero in cases of known postovulatory age (33–86 days) agree well with those in length/age tables in current embryological usage. Within the embryonic period proper, however, for a given age, the ultrasonic lengths are usually 1 to 5 mm longer than those of fixed specimens. The probable reasons for this are discussed.This publication has 8 references indexed in Scilit:
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