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With adjustment for maternal age, smoking, and first-trimester vaginal bleeding, standard guidelines for adjudicating differences in ultrasound and LMP dating underestimated SGA birth by 12.9% and overestimated preterm delivery by 8.7%.This methodological approach can be applied by researchers using different study populations in similar research contexts.Accurate gestational age (GA) dating of pregnancies is vital to public health surveillance and research investigating the causes of small-for-gestational-age (SGA) birth and preterm delivery (PTD).

After restricting the analysis to subjects with first-trimester prenatal care, a nonmissing date of the last menstrual period (LMP), and early ultrasound ( = 1,135), SGA subjects’ ultrasound GA was 5.5 days less than their LMP GA, on average.Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.The ideal time for a sonographer to assess the gestational age in the first trimester is between 7-10 weeks of pregnancy.

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Research shows that routine obstetric ultrasound before 24 weeks gestational age can significantly reduce the risk of failing to recognize multiple gestations and can improve pregnancy dating to reduce the risk of labor induction for post-dates pregnancy.

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