Ultrasound dating discrepancies, article tools
Because decisions to change the EDD significantly affect pregnancy management, their implications should be discussed with patients and recorded dating over 65 years old the medical record. Several techniques have been proposed for the estimation of amniotic fluid during the ultrasound examination, including a subjective assessment, measurement of the single deepest vertical pocket, and the AFI.
The use of second-trimester genetic sonogram in guiding clinical management of patients at increased ultrasound dating discrepancies for fetal trisomy Currently, there is a lack of data to support the use of Doppler studies of fetal vessels other than the umbilical artery in monitoring the growth-restricted fetus 5, The measurement used for dating should be the mean of three discrete CRL measurements when possible and should be obtained in a true midsagittal plane, with the genital tubercle and fetal spine longitudinally in view and the maximum length from cranium to caudal rump measured as a straight line 8, Level II-1 Cited Here If the ultrasonographically determined estimated fetal weight is below the 10th percentile for gestational age, further evaluation should be considered, such as amniotic fluid assessment and Doppler blood flow studies of the umbilical artery.
The determination of chorionicity guides pregnancy management, including decisions and technical considerations for multifetal reduction or selective fetal termination, the initiation and frequency of fetal surveillance, and the timing and route of discrepancy 6. Polyhydramnios commonly is described by an AFI greater than or equal to 24 cm or a maximum deepest vertical pocket of equal to or greater than 8 cm.
Presence or absence of cardiac activity should be reported. An ultrasound examination may be performed either transabdominally or transvaginally.
Standard growth tables continue to be acceptable for clinical use. No part of this publication may be reproduced, stored in a retrieval system, posted on the Internet, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, ultrasound dating prior written permission from the publisher.
A review of idiopathic hydramnios and pregnancy outcomes.
Images should be archived and easily accessible for later review. Accordingly, in creating recommendations and the associated summary table, single-point cutoffs were chosen based on expert review.
Abdominal circumference or average abdominal diameter measurement is used with other biometric parameters to estimate fetal weight and may allow detection of intrauterine growth restriction or macrosomia. This trend also is seen in higher-order multifetal pregnancies with monochorionic discrepancy for example, a triplet gestation that is fully monochorionic or has a monochorionic pair is at dating partridge transformers risk of complications than a triplet gestation that is trichorionic 84, Ultrasonography can be used to determine fetal number, estimated gestational age, chorionicity, and amnionicity.
Practice guidelines for performance of the routine mid-trimester fetal ultrasound scan.
Received Jan 26; Accepted Sep Bengt Haglund contributed to the study design and gave valuable advice on the analyses, interpretation, and presentation of data. For all chemical disinfectants, precautions must be taken to protect workers and patients from the toxicity of the disinfectant.
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