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Biparietal diameter BPD is one of the basic biometric parameters used to assess fetal size. In the second trimester this may be extrapolated to an estimate of gestational age and an estimated due date EDD. The BPD should be measured on an axial plane that traverses the thalami, and cavum septum pellucidum. The transducer must be perpendicular to the central axis of the head, and thus the hemispheres and calvaria should appear symmetric. BPD has been shown to be accurate in predicting gestational age from 14 to 20 weeks 2. The variability increases after this time.
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Received 27 June ; revised 28 July ; accepted 28 August Rapid and accurate determination of gestational age GA may be vital to the appropriate care of the critically ill pregnant patient and improve obstetric care through allowing the optimal timing of necessary interventions and the avoidance of unnecessary ones. Ultrasound scans are considered to be the most cost-effective, accurate and safe methods for measurement of various fetal parts in pregnant women. The aim of this research is to explore the accuracy of ultrasound in determining gestational age of fetus in third trimesters. Only women with single live fetus were included in this study. Women who participated in the study were selected on following criteria: Regular menstrual cycles, known date of last menstrual period and previous live normal neonates in multipara.
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Estimation of Fetal Weight

Introduction: Assessment of gestational age GA in pregnancy can be carried out by measuring several fetal parameters in ultrasound scans and serial ultrasounds can monitor fetal growth. This study was carried out to assess GA in second and third trimesters with the help of ultrasonography measurements of one of the important fetal parameter that is, the bi-parietal diameter BPD in the local population southern zone of Rajasthan. Materials and Methods: A total of normal pregnant females were studied with the known last menstrual period in the southern part of Rajasthan. GA determined by measurement of fetal BPD with real time ultrasonography machine. Mean BPD showed an increase of 2.
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Now fully updated with more than 2, new images and new content throughout, Diagnostic Ultrasound, 5th Edition, by Drs. Carol M. Rumack and Deborah Levine, remains the most comprehensive and authoritative ultrasound resource available. Spanning a wide range of medical specialties and practice settings, it provides complete, detailed information on the latest techniques for ultrasound imaging of the whole body; image-guided procedures; fetal, obstetric, and pediatric imaging; and much more.

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