How accurate are dating scans at 17 weeks

Occasionally, if they can't see what they need to, the sonographer may ask you to have a transvaginal scan, where a very thin probe is used to look at the baby from close to the cervix. You will be able to watch the monitor and see the first pictures of your baby, which is always an extraordinary moment, whether this is your first baby or your fifth.It may not be immediately obvious which parts of your baby you're looking at, but the sonographer will be able to help you work it out.The sonographer will tuck some tissues under your clothes so you don't get gel all over them.He or she will then move a hand-held transducer over your belly, which bounces high-frequency sound waves off your baby to create a picture on the monitor.Get weekly insight into your baby and your body's development, with our pregnancy newsletter – from the symptoms to expect to supplements you should be taking.The dating scan is usually done at some point between 8 weeks and 14 weeks pregnant.

There are two routine scans in pregnancy and the first is called the 12-week scan or “dating” scan – this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date.

First trimester ultrasound is most accurate at estimating gestational age within 5-7 days (depends on the center). General rule: 2nd trimester scans for dating are /- 14 days and 3rd trimester is the least accurate ( /-21 days). Read more See 1 more doctor answer An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body.

In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical Due dating pregnancies is more accurate with more than one ultrasound performed.

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