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Ultrasonographic Measurement of Fetal Heart Volume for Estimation of Birthweight

Department of Obstetrics and Gynecology, Harvard Medical School, Beth Israel Hospital, Boston, Massachusetts.

The heart volume and biparietal diameter of the fetus were measured by B-mode ultra-sonography in 46 normal pregnant patients with gestational ages ranging from 30 to 41 weeks. The fetal heart volume correlated well with the gestational age and biparietal diameter. In 31 pregnancies where these measurements were done within 20 days of parturition, estimation of birthweight from the biparietal diameter or the heart volume alone had a standard deviation of 493 g and 526 g, respectively. When both of these measurements were used, the standard deviation of estimates was 492 g. Although the fetal heart volume was not more accurate for estimating specific birthweight than the biparietal diameter, it was found to be useful for determining whether or not birthweight was greater than 2500 g.

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