Abstract
Background/Objective: This study was performed to identify pregnancy outcome in a population of Saudi women with good documentation of the last menstrual period [LMP] to construct an institution specific CRL model and to compare its ability in predicting gestational age [GA] with previously published nomograms in order to determine correct gestational age and to compare with other studies to demonstrate variation, if any, and to assess the relation between CRL and GA.
Methods: A CRL parameter was establish for gestational age estimation of 30 singleton fetuses in Saudi Arabia-AL Ahsa populations. Measurements were obtained by placing the calipers of the ultrasound machine from the crown to the rump. The obtained measurements were compared to previously published nomogram to determine if Saudi populations need a different nomogram measurement. Correlation coefficient and P value were measured.
Result: The CRL corresponds to Rampen's nomogram from 8-10 weeks. There is addition of 3 mm at weeks 7. Also, CRL and GA p value and correlation coefficient were highly significant.
Conclusion: The measurement obtained for Saudi women were comparable with the previous published nomograms with minimum difference. And the study proved that CRL is strongly correlated with GA.