Obstetrics practitioner helped develop ultrasound". SPECT gamma ray: First trimester ultrasound screening is effective in reducing postterm labor induction rates: It has been reported that approximately one half of women accurately recall their LMP 2—4. Retrieved 17 August These markers are often not clinically significant and do not cause adverse pregnancy outcomes. Ultrasound Obstet Gynecol.
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Recommendations The American College of Obstetricians and Gynecologists, the American Institute of Ultrasound in Medicine, and the Society for Maternal—Fetal Medicine make the following recommendations regarding the method for estimating gestational age and due date: