Pregnancy Wheel | Calculating Due Date with Pregnancy Wheel
Ultrasound Obstet Gynecol. Apr;31(4) doi: /uog New charts for ultrasound dating of pregnancy and assessment of fetal growth. Customized fetal growth charts are needed to provide an accurate fetal assessment For this purpose, ultrasound obstetric scans in pregnancy are . week of pregnancy, because reliable dating of pregnancy is more difficult. Fetal Size and Dating: Charts Recommended for Clinical Obstetric Practice. Article (PDF Available) in Ultrasound 17(3) · August
The best available data support adjusting the EDD of a pregnancy if the first ultrasonography in the pregnancy is performed in the third trimester and suggests a discrepancy in gestational dating of more than 21 days.
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Conclusion Accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative. As soon as data from the LMP, the first accurate ultrasound examination, or both are obtained, the gestational age and the EDD should be determined, discussed with the patient, and documented clearly in the medical record. The American College of Obstetricians and Gynecologists, the American Institute of Ultrasound in Medicine, and the Society for Maternal—Fetal Medicine recognize the advantages of a single dating paradigm being used within and between institutions that provide obstetric care.
Table 1 provides guidelines for estimating the due date based on ultrasonography and the LMP in pregnancy, and provides single-point cutoffs and ranges based on available evidence and expert opinion.
Fetal Imaging Workshop Invited Participants. A comparison of recalled date of last menstrual period with prospectively recorded dates.
J Womens Health Larchmt ; Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Am J Obstet Gynecol ; Last menstrual period versus ultrasound for pregnancy dating.
Int J Gynaecol Obstet ; First trimester ultrasound screening is effective in reducing postterm labor induction rates: Ultrasound for fetal assessment in early pregnancy. Cochrane Database of Systematic ReviewsIssue 7. Predicting delivery date by ultrasound and last menstrual period in early gestation. New charts for ultrasound dating of pregnancy and assessment of fetal growth: Ultrasound Obstet Gynecol ; First- and second-trimester ultrasound assessment of gestational age.
Gestational age - Wikipedia
First- vs second-trimester ultrasound: Br J Obstet Gynaecol ; Gestational age in pregnancies conceived after in vitro fertilization: Ultrasound dating at 12—14 weeks of gestation. A prospective cross-validation of established dating formulae in in-vitro fertilized pregnancies.
Accuracy of gestational age estimation by means of fetal crown—rump length measurement. Estimation of gestational age by transvaginal sonographic measurement of greatest embryonic length in dated human embryos. Ultrasound Obstet Gynecol ;4: Underestimation of gestational age by conventional crown—rump length dating curves.
New crown—rump length curve based on over pregnancies.
BioMed Research International
Standardization of sonar cephalometry and gestational age. Sonographic prediction of gestational age: Conceptional age, menstrual age, and ultrasound age: American College of Obstetricians and Gynecologists.
Computer assisted analysis of fetal age in the third trimester using multiple fetal growth parameters. J Clin Ultrasound ; 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, without prior written permission from the publisher.
A more recent development is the Power Doppler Doppler angiography. It uses amplitude information from doppler signals rather than flow velocity information to visualize slow flow in smaller blood vessels.
A color perfusion-like display of a particular organ such as the placenta overlapping on the 2-D image can be very nicely depicted. Doppler examinations can be performed abdominally and via the transvaginal route.
The power emitted by a doppler device is greater than that used in a conventional 2-D scan. Its use in early pregnancy is therefore cautioned. Doppler facilities are generally an integral part of modern ultrasound scanners. They merely would need to be switched on to function. One does not need to 'go' to another machine for the doppler investigations.
The transducer takes a series of images, thin slices, of the subject, and the computer processes these images and presents them as a 3 dimensional image.
Ultrasound Reference Chart Based on IVF Dates to Estimate Gestational Age at 6–9 weeks’ Gestation
Using computer controls, the operator can obtain views that might not be available using ordinary 2-D ultrasound scan. It too, is very much in the News. Faster and more advanced commercial models are coming into the market.
The scans requires special probes and software to accumulate and render the imagesand the rendering time has been reduced from minutes to fractions of a seconds.
A good 3-D image is often very impressive to the parents.