Abstract
Introsution: Gestational age of fetus is estimated by including various biometric parameters. Newer parameters like fetal kidney length have not been studied in Nepalese population.
 Objective: To determine gestational age by fetal kidney length measurement after the 20th week of gestation in healthy women with uncomplicated pregnancy.
 Method: Obstetric sonography was performed in 108 pregnant women with regular menstrual cycles, known menstrual age and uncomplicated pregnancy from 20 weeks to term. Fetal kidney length was evaluated as a measure to calculate the predicted gestational age.
 Results: The study showed mean fetal kidney length at 20-24, 25-29, 30-34 and 35-37 weeks gestation 22.5 ± 0.5, 26.9 ± 0.7, 32.32 ± 0.7 and 36.3 ± 0.6 mm, respectively. Overall, in second and third trimester, fetal kidney length showed strong linear correlation with gestation age with highest significant Pearson correlation coefficient of 0.989 as compared to other parameters (BPD=0.986, HC=0.976, AC= 0.971, FL= 0.984).
 Conclusion: Fetal kidney length can be used as a reliable parameter for determination of gestational age.
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