New charts for ultrasound dating of pregnancy
Multivariable linear regression was conducted to determine the extent to which ultrasound GA predicted LMP dating and to correct for systematic misclassification that results after applying standard guidelines to adjudicate differences in these measures.
In the unadjusted model, SGA subjects required a correction of 1.5 weeks to the ultrasound estimate.
The rise in h CG concentration in early pregnancy is uniform and therefore h CG levels provide the most accurate, early estimation of GA in single, viable pregnancies.
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The accuracy of h CG measurement in determining the week since conception was more than 93%.