Predictive Accuracy of Transcerebellar Diameter in Comparison with Other Foetal Biometric Parameters for Gestational Age Estimation among Pregnant Nigerian Women.

OBJECTIVE To compare the predictive accuracy of foetal trans-cerebellar diameter (TCD) with those of other biometric parameters in the estimation of gestational age (GA). DESIGN A cross-sectional study. SETTING The University of Benin Teaching Hospital, Nigeria. SUBJECTS Four hundred and fifty healthy singleton pregnant women, between 14-42 weeks gestation. MAIN OUTCOME MEASURES Trans-cerebellar diameter (TCD), biparietal diameter (BPD), femur length (FL), abdominal circumference (AC) values across the gestational age range studied. Correlation and predictive values of TCD compared to those of other biometric parameters. RESULTS The range of values for TCD was 11.9 - 59.7mm (mean = 34.2 ± 14.1mm). TCD correlated more significantly with menstrual age compared with other biometric parameters (r = 0.984, p = 0.000). TCD had a higher predictive accuracy of 96.9% ± 12 days), BPD (93.8% ± 14.1 days). AC (92.7% ± 15.3 days). CONCLUSION TCD has a stronger predictive accuracy for gestational age compared to other routinely used foetal biometric parameters among Nigerian Africans.