Ultrasound Dating Criteria

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PDF Ultrasound Dating Criteria - ANMC
PDF Ultrasound: Dating Criteria and Worksheet Dating Criteria
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Ultrasound Dating Criteria Background Determining the first day of the LMP traditionally is the first step in establishing the estimated date of delivery (EDD) . By convention, the EDD is 280 days after the first day of the LMP . Because this practice assumes a regular menstrual cycle of 28 days, with ovulation occurring on the 14th day after the
Ultrasound : Dating Criteria and Worksheet Dating Criteria Background Determining the first day of the LMP traditionally is the first step in establishing the estimated date of delivery (EDD) . By convention, the EDD is 280 days after the first day of the LMP . Because this practice
If dating by ultrasonography performed between 14 0/7 weeks and 15 6/7 weeks of gestation (inclusive) varies from LMP dating by more than 7 days, or if ultrasonography dating between 16 0/7 weeks and 21 6/7 weeks of gestation varies by more than 10 days, the EDD should be changed to correspond with the ultrasonography dating Table 1 .Between 22 0/7 weeks and 27 6/7 weeks of gestation, ultrasonography dating has an accuracy of ± 10-14 days 19 .
2017 guidelines from The American College of Obstetricians and Gynecologists (ACOG) recommend consideration of redating when gestational age via LMP is discrepant with gestational age via ultrasound as below 1: first trimester (measured via CRL) ≤8+6 weeks: >5 days; 9 to 13+6 weeks: >7 days; second and third trimesters (measured via BPD, HC, AC, FL)
Ultrasound dating should take precedence over clinical dating if: the LMP is uncertain or abnormal, there is a more than 5 day discrepancy between historical / clinical parameters and ultrasound measurements at ≤ 8⁶⁄₇ weeks, or there is a more than 7 day discrepancy between historical/clinical parameters and ultrasound measurements at . . .
The results indicate that, up to 24 weeks of pregnancy, dating by ultrasound examination provides a better prediction of the date of delivery than does last menstrual period . The earlier the ultrasound assessment in pregnancy, preferably between 10 and 12 weeks, the better the estimate of gestational age .
Note the table below, which explains the criteria for re- dating in the first trimester . In summary, when less than 9 weeks use the ultrasound findings over the LMP when the discrepancy is greater than 5 days . When LMP places the pregnancy between 9w0d and 13w6d use the ultrasound findings when the discrepancy is greater than 7 days .
Therefore, dating pregnancies by early ultrasound examination at 8-14 weeks, based on measurement of the fetal crown-rump length (CRL), appears to be the most reliable method to establish gestational age . Once the CRL exceeds 84 mm, . . . AC and FL measurement can be performed using scored criteria ; . . .
Obstetrical Ultrasound Medical Necessity Criteria OBUS-2~GENERAL OBSTETRICAL ULTRASOUND INDICATIONS: FIRST TRIMESTER (<14 weeks gestation) OBUS-2 GUIDELINE NUMBER and TITLE PAGE OBUS-2 .1 Uncertain Dates 7 OBUS-2 .2 Unequal Fundal Size and Dates 7 OBUS-2 .3 High Risk Pregnancy 8 OBUS-2 .4 Genetic Ultrasound Screening 9 OBUS-2 .5 Vaginal Bleeding
an ultrasound scan should be performed just prior to delivery and also before instigating any specific neonatal intervention . Routine monitoring of twin pregnancy with ultrasound • Women with an uncomplicated dichorionic twin preg-nancy should have a first-trimester scan, a detailed second-trimester scan, and scans every 4 weeks there-after .
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Ultrasound Dating Criteria

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