بررسي دقت سه روش تخمين تاريخ زايمان

The Study of the Accuracy of Three Methods in Estimation of Delivery Date

Introduction: Estimation of deliveiy date based on last menstrual period and ultrasound is common in prenatal care. The aim of this study was to compare the accuracy of NaegePs rule, NaegePs revised rule and ultrasound in estimation of delivery date. Methods: This cross-sectional study was done on 540 pregnant women hospitalized in Mobayyeni Hospital in Sabzevar (2007-2008) due sign of to labor. Estimated delivery date was calculated based on three methods and difference between these and ture date of labor calculated. Data was analyzed by descriptive statistical indiccs, Pearson correlation and T-test using Spssl5. Results: Results showed that delivery happened in 6.3, 6.3 and 6.7 percent of women just on the stimated date by Naegelʹs rule, Naegelʹs revised rule and ultrasound respectively and delivery happened in 51.9, 67.2 and 60.7 percent of them until the estimated date. The difference between true date and the estimated date by Naegelʹs rule and ultrasound were correlated significantly with fun da I height and birth weight (p<0.001). Post term delivery rates were 0.4, 1.9 and 0.6 percent respectively, based on ultrasound reports, NaegePs rule and NaegePs revised rule. Conclusion: NaegePs rule is more accurate in prediction of delivery dale, compared to other similar studies. Using ultrasound prolongs the period preceding the beginning of labor. Using NaegePs revised rule strongly brings better results. Keywords: Birth date estimatiiin; Gestational age; Labor; NaegePs rule; Ultrasound