Abstract
Objective: To assess if three diagnostic criteria (DC) of alteration of fetal growth can be used interchangeably. Methods: We studied 1812 consecutive live singleton births, free of malformations, whose mothers received prenatal care and had certainty on date of last menstrual periods. Sensitivity and specificity were determined for: birth-weight <2500g (LBW), birth-weight <P10 of birth-weight for gestational age and sex according to local standards (IUGRJ) and to Lubchenco (IUGRL). Each DC was used alternately as reference. Results: With LBW as reference, sensitivities were low for IUGRJ and IUGRL (47.4%, 19.3%) for preterm neonates, and high (98.9%, 80.6%) for term neonates; specificities were high (95.5%–100%) for all DC. With IUGRJ as reference, LBW showed 100% sensitivity and 44.5% specificity; IUGRL showed 40.6% sensitivity and 100% specificity in preterm neonates. Both criteria showed fair sensitivity and high specificity in term neonates. Conclusion: DC cannot be used interchangeably to assess fetal growth status at birth.
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