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Accuracy of ultrasonographic determination of fetal weight at term among Filipinos
Author(s) -
Vitug M. R. S.,
Rivera R. P.,
Clemente L. R.
Publication year - 2001
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.2001.abs27-25.x
Subject(s) - medicine , in utero , birth weight , fetal weight , fetus , obstetrics , diagnostic accuracy , predictive value , body weight , weight estimation , pediatrics , gold standard (test) , pregnancy , statistics , mathematics , genetics , biology
Background: The birth weight of an infant is one of the most important factors affecting its survival. Four computer‐generated formulas, Hadlock, Merz, Osaka and Shepard for weight estimation are in common use in our institution, but none of them has been devised specifically for Filipinos. It is the objective of the study to determine which among these formulas is accurate in diagnosing the fetus weighing 4000 g or more among Filipinos. Methods: The accuracy of in utero fetal weight estimations were evaluated prospectively in 74 Filipino patients during the study period. Sonographic estimate was performed by a single sonologist within 24–48 h of delivery. Estimates of fetal weight were calculated using the Hadlock, Merz, Osaka and Shepard. The newborn birth weight were measured within 30 min of delivery. The results were then compared with the actual birth weight. Results: Of the 74 patients seen, 62 patients were included. Eighteen (29%) had a birth weight less than 3000 g, 40 (65%) weighed between 3000 and 3999 g and six (10%) had a birth weight of 4000 g or more. When birth weight is less than 3000 g, Osaka and Merz conferred the same diagnostic accuracy but the former had a significantly higher negative predictive (88%). For birth weight ranging from 3000 to 3999 g, Hadlock had the highest diagnostic accuracy (100%). This report confirms that the best in utero weight estimations among fetuses weighing 4000 g or more result from the use of Shepard formula which has sensitivity, specificity, positive and negative predictive values and diagnostic accuracy of 100%. Conclusion: Since the accuracy of Shepard formula in estimating fetal weight 4000 g or more is significantly better than those based on Hadlock, Merz and Osaka, we recommend the use of such formula in intrapartum fetal weight estimations among Filipinos. This estimated weights can offer guidance in predicting fetal macrosomia, and therefore, aid in obstetric management.