Accuracy of dating ultrasound at 12 weeks
Doppler Ultrasound The doppler shift principle has been used for a long time in fetal heart rate detectors. Further developments in doppler ultrasound technology in recent years have enabled a great expansion in its application in Obstetrics, particularly in the area of assessing and monitoring the well-being of the fetus, its progression in the face of intrauterine growth restriction, and the diagnosis of cardiac malformations. Doppler ultrasound is presently most widely employed in the detection of fetal cardiac pulsations and pulsations in the various fetal blood vessels. The "Doptone" fetal pulse detector is a commonly used handheld device to detect fetal heartbeat using the same doppler principle. Blood flow characteristics in the fetal blood vessels can be assessed with Doppler 'flow velocity waveforms'. Diminished flow, particularly in the diastolic phase of a pulse cycle is associated with compromise in the fetus.
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Underestimation of gestational age by conventional crown-rump length growth curves. Reprinted with permission of American College of Obstetricians and Gynecologists Variations in the measurement of CRL can be attributed to differences in fetal growth patterns. Such differences are related to factors similar to those that influence birth weight curves, including maternal age and parity, prepregnancy maternal weight, geographic location, and population characteristics. These include incorporation of the yolk sac or lower limbs in the CRL measurement, excessive curling or extension of the fetus, and tangential section of the trunk.
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How Far Along Am I? How Many Weeks Am I?
Irregular or No Last Period? About How far along am I, a question asked frequently by pregnant mothers, refers to the amount of time that has elapsed since the start of a woman's last menstrual period LMP. Pregnancy is normally counted from a woman's last menstrual period which is about two weeks before baby is actually conceived. Pregnancy - from start to due date - is either 40 or 38 weeks' long, depending on the start date used.
Prediction of ectopic pregnancy in women with a pregnancy of unknown location. Ultrasound Obstet Gynecol ; Symptomatic patients with early viable intrauterine pregnancy: Obstet Gynecol ; Single dose methotrexate for the treatment of ectopic pregnancy.
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