Dating Obstetric Scan
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How is a dating scan performed? A dating scan is carried out by ultrasound . A sonographer, who is usually a radiographer or a midwife trained in ultrasound, will complete your scan . If the scan is after 10 weeks, ultrasound recordings are usually made through your abdomen . The sonographer will put gel on your abdomen and move a hand-held device called a transducer, back and forward over your skin . In some situations, such as when the scan is completed before 10 weeks of gestation or you are . . .
12-week scan . If you're pregnant in England you'll be offered an ultrasound scan at around 10 to 14 weeks of pregnancy . This is called the dating scan . It's used to see how far along in your pregnancy you are and check your baby's development . The scan may also be part of a screening test for Down's syndrome .
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 Β± 10-14 days 19 .
The common first step will be a dating scan between 7-10 weeks as we like to check your baby before 10 weeks . Why scan at 7 weeks? An ultrasound is performed at this stage of pregnancy to confirm your due date, confirm if you are having singles, twins or more and to visualise your baby's heart beating .
Naegele's Rule is a simple way to calculate the due date based on the last menstrual period (LMP) and estimate gestational age prior to the Obstetric /OB ultrasound assessment . Due Date = Date of first day of last menstrual period (LMP) + 9 Calendar months + 7 days . For example, if the LMP was 7/16/20, add 9 months (4/16/21), then add 7 days = 4/23/21
If you know the date of the first day of your last menstrual period (LMP), or have already had your first ultrasound scan , you can use this tool . Please remember that the result will not necessarily be the day that your baby arrives . The actual date may be any time from 38 to 42 weeks in most pregnancies .
Pregnancy / Obstetric Ultrasound . Below are the common scans performed during the course of a pregnancy . Additional scans may be referred at any time during the course of your pregnancy to check the wellbeing of the baby and mother . 1 st Trimester Scans Dating Scan
The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) recommends that pregnant women have routine obstetric ultrasounds between 18 weeks' and 22 weeks' gestational age (the anatomy scan ) in order to confirm pregnancy dating , to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple pregnancies (twins, etc) .
The Royal College of Obstetricians & Gynaecologists (in their 2000 document on Ultrasound Screening), recommend an Early Pregnancy Scan , undertaken before 15 weeks, which can combine the functions of the Early Viability Scan , Nuchal Translucency Scan and dating scan . There is also then a routine scan at 20 weeks .
Scan Considered the most common type of ultrasound, this is a two-dimensional scan that reflects structure and motion over time . The scanning and display of ultrasound images are run at a sufficiently rapid rate so that moving structures can be viewed moving at their natural rate . Frame rates > 15 frames per second are considered real time .
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Dating Obstetric Scan
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