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Am J Obstet Gynecol. 1975 May 1;122(1):9-12.

Fetal crown-rump length and biparietal diameter in the second trimester of pregnancy.

Abstract

This study examines the relationships between fetal size (biparietal diameter and crown-rump length) and gestational age among subjects aborted by hypertonic saline in the second trimester of pregnancy. With a confidence of 90 per cent, biparietal diameter can be used to predict gestational age within plus or minus 2 weeks, and crown-rump length can be used to predict gestational age within plus or minus 3 weeks.

PMID:
1130447
[PubMed - indexed for MEDLINE]
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