The gestational sac in 2D ultrasound at 4–6 weeks' gestation

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The gestational sac in 2D ultrasound at 4–6 weeks' gestation

Reference(s):Oh JS, Wright G, Coulam CB. Gestational sac diameter in very early pregnancy as a predictor of fetal outcome. Ultrasound Obstet Gynecol 2002;20(3):267–9. PubMed PMID: 12230450.