Evaluation of Fetal Kidney Length in Relation to Femur Length as an Accurate Method of Estimation of Gestational Age in Third Trimester
Mohammad Abd ElHameed Mohammad Nasr AdDeen, Hosam Mohammad Mohammad Hemeda, Mina Tharwat Nassif Makram- General Medicine
Background
Accuracy in estimation of gestational age (GA) has become more demanding as technology used in ultrasonography has become more advanced. Patient’s expectations have also increased and they expect exact estimations to plan their pregnancies.
Aim of the Work
To compare the accuracy of fetal kidney length in relation to FL regarding to estimation of gestational age in third trimester.
Patients and Methods
In our study we concluded about 120 pregnant women who fulfilled the inclusion criteria and women who did not fulfil the inclusion criteria were excluded from the study. We compared the gestational age derived from the regression equation from Femur Length and Mean Fetal kidney length in regarding to the gold standard method of estimation the gestational age which is early ultrasound scan and dating between 7-11 weeks of gestation using the Crown Rump Length CRL.
Results
We found that gestational age from FL has an accuracy of ± 1.04 weeks (standard error of estimate [standard deviation of residuals] = 1.04 weeks) and good overall fit (coefficient of determination R2 = 0.869). And the gestational age from MKL has an accuracy of ± 0.82 weeks (standard error of estimate [standard deviation of residuals] = 0.82 weeks) and good overall fit (coefficient of determination R2 = 0.918).
Conclusion
Fetal kidney length has been studied and shown to strongly correlate with the gestational age in late trimesters.