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Accuracy of emergency physician performed bedside ultrasound in determining gestational age in first trimester pregnancyKeywords: Gestational age dating, Bedside ultrasound, First trimester pregnancy Abstract: A prospective convenience sample of ED patients presenting in the first trimester of pregnancy (based upon self-reported LMP) regardless of their presenting complaint were enrolled. EDUGA was compared to gestational age estimated by ultrasound performed in the department of radiology (RGA) as the gold standard. Pearson’s product moment correlation coefficient was used to determine the correlation between EDUGA compared to RGA.Sixty-eight pregnant patients presumed to be in the 1st trimester of pregnancy based upon self-reported LMP consented to enrollment. When excluding the cases with no fetal pole, the median discrepancy of EDUGA versus RGA was 2 days (interquartile range (IQR) 1 to 3.25). The correlation coefficient of EDUGA with RGA was 0.978. When including the six cases without a fetal pole in the data analysis, the median discrepancy of EDUGA compared with RGA was 3 days (IQR 1 to 4). The correlation coefficient of EDUGA with RGA was 0.945.Based on our comparison of EDUGA to RGA in patients presenting to the ED in the first trimester of pregnancy, we conclude that emergency physicians are capable of accurately performing this measurement. Emergency physicians should consider using ultrasound to estimate gestational age as it may be useful for the future care of that pregnant patient.Pregnant females commonly present to the emergency department (ED) with complaints of pain, bleeding, or other symptoms that necessitate an evaluation to determine the presence of an intra-uterine pregnancy or determine the viability of the pregnancy. The ED is often where the first evaluation of a pregnancy takes place.Three methods used to estimate gestational age (GA) are menstrual history, clinical examination, and ultrasonography. Previous studies have shown that women cannot provide accurate information about their LMP, can have irregular cycle lengths, and can have irregular ovulation from cycle to cycle, making GA dating calculated by LMP often inaccurate [1,2]. The size o
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