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Fetal head and abdominal circumferences: II. A critical re‐evaluation of the relationship to menstrual age
Author(s) -
Deter Russell L.,
Harrist Ronald B.,
Hadlock Frank P.,
Carpenter Robert J.
Publication year - 1982
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870100804
Subject(s) - medicine , gestational age , ultrasound , fetus , pregnancy , fetal head , obstetrics , gynecology , biology , genetics , radiology
Dynamic image ultrasound was utilized to re‐examine the changes in head and abdominal circumferences (HC, AC) with gestational age in normal fetuses. Data collected in a cross‐sectional study of fetal growth were evaluated using mathematical modeling techniques. The results of this analysis indicated that a linear‐cubic function optimally fits the HC data (R 2 = 97.3%) while the AC data was fitted optimally by a linear function (R 2 = 95.5%). The predicted values calculated from these functions were in very close agreement [mean deviation (absolute value): 1.97% (HC), 1.38% (AC)] with those calculated from average functions for HC and AC obtained in a previous longitudinal growth study. Variability was not constant throughout pregnancy for either HC or AC. With HC the normal range changed from ±1.5 cm to ±2.5 cm at 28 wk (menstrual age). The AC variability increased progressively with increasing menstrual age and was shown to be related to the predicted AC value. The normal range was found to be 13% of the predicted AC value throughout pregnancy. Based on these results, a new set of normal HC and AC values for the 12–40 wk (menstrual age) period is presented.