Ultrasound dating vs lmp


Because decisions to change the EDD significantly affect pregnancy management, their implications should be discussed with patients and recorded in the medical record. Measurements of the CRL are more accurate the earlier in the first trimester that ultrasonography is performed 11, 15— 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, Mean sac diameter measurements are not recommended for estimating the due date.

Dating changes for smaller discrepancies are appropriate based on how early in the first trimester the ultrasound examination was performed and clinical assessment of the reliability of the LMP date Table 1. For instance, the EDD for a pregnancy that resulted from in vitro fertilization should be assigned using the age of the embryo and the date of transfer. For example, for a day-5 embryo, the EDD would be days from the embryo replacement date. Likewise, the EDD for a day-3 embryo would be days from the embryo replacement date.


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Using a single ultrasound examination in the second trimester to assist in determining the gestational age enables simultaneous fetal anatomic evaluation. With rare exception, if a first-trimester ultrasound examination was performed, especially one consistent with LMP dating, gestational age should not be adjusted based on a second-trimester ultrasound examination. Ultrasonography dating in the second trimester typically is based on regression formulas that incorporate variables such as.

Other biometric variables, such as additional long bones and the transverse cerebellar diameter, also can play a role. Date changes for smaller discrepancies 10—14 days are appropriate based on how early in this second-trimester range the ultrasound examination was performed and on clinician assessment of LMP reliability. Because of the risk of redating a small fetus that may be growth restricted, management decisions based on third-trimester ultrasonography alone are especially problematic; therefore, decisions need to be guided by careful consideration of the entire clinical picture and may require close surveillance, including repeat ultrasonography, to ensure appropriate interval growth.

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. 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.

Women's Health Care Physicians

For the purposes of research and surveillance, the best obstetric estimate, rather than estimates based on the LMP alone, should be used as the measure for gestational age. 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.


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  8. 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. Methods for estimating the due date.

    Dating your Pregnancy | The MotHERS Program™

    American College of Obstetricians and Gynecologists. Women's Health Care Physicians. 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: As soon as data from the last menstrual period 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.

    Introduction An accurately assigned EDD early in prenatal care is among the most important results of evaluation and history taking. Clinical Considerations in the Second Trimester Using a single ultrasound examination in the second trimester to assist in determining the gestational age enables simultaneous fetal anatomic evaluation.

    Just wondering what other people's thoughts and experiences are. This means I'm now 13w3 days instead of in the 12 week so that makes me happy if it's true lol. I guess yours was very confident. Your baby will most likely be fine and just as healthy. I'm sure if you wanted see what presents itself closer to your due date you can even push a scheduled c out a few days esp if this is your first. Dating scans are more accurate since you can ovulate early or later.

    Based off of LMP with my daughter I would have been due February 12th dating scan changed it to February 5th a week before. I ended up delivering at 41 weeks and it was definitely correct she was 8lbs and 20inches long and she also passed merconium I trust technology more than a day that I try to remember.

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    Most doctors will let you go overdue for a week or two anyway. With this one I will go early or on my due date because of the fact that my daughter passed merconium and we are going to try and avoid that this time. Based off my LMP I should be 14w1d, but when I had my dating scan, the measured the baby an entire week back.

    compnetctigethra.tk My DR did change my due date so I went from the 6th to 13th. He also threw in there that the baby could have a growth spurt though and it's really not a big deal. With my first 3 pregnancies my baby's measured right on track with my lmp at 12 and 20 week ultrasound. I'm now on my 4 pregnancy and I had a ultrasound on Friday when I thought I was 12 weeks and 2 days. My baby measured at 13 weeks and 3 days so my dr changed my due date. Regression models using a combination of any two or three ultrasonic variables did not improve accuracy of prediction. When ultrasound was used instead of certain LMP, the number of postterm pregnancies decreased from Ultrasound was more accurate than LMP in dating, and when it was used the number of postterm pregnancies decreased.

    Combining more than one ultrasonic measurements did not improve dating accuracy.

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