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12 week dating scan accuracy

However, if your sonographer can't get a clear picture, she may offer you a transvaginal scan to confirm the position of your placenta.

In your third trimester, your doctor or midwife may recommend that you have a growth scan between 28 weeks and 40 weeks. She may ask you to half empty your bladder, which will make the scan more comfortable.

If you need any additional, special scans, these will be carried out by a doctor who is trained in ultrasound (fetal medicine specialist). Fetal anomaly screening programme standards: 2015 to 2016 NHS Fetal Anomaly Screening Programme.

If you’re having a scan in early pregnancy, you’ll need to drink a few glasses of water beforehand.

A first-trimester scan will check that your baby's heart is beating and also look at the basic anatomy of your baby’s head, abdominal wall, and limbs.

Ultrasound scans have been used in pregnancy for decades, and nobody has found them to be harmful if carried out correctly.

These appear white in the image, and soft tissues appear grey.

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Fluids, such as the amniotic fluid surrounding your baby, appear black.A full bladder helps the ultrasound echoes to reach your womb, giving the sonographer a good view of your baby. If your baby's still deep in your pelvis, or if you're overweight, the image won't be very clear. This is to check that your baby is developing normally. Most of the time, the placenta has moved into a better position by the time you're 32 weeks pregnant. During your first trimester, you may have an early scan at about six weeks or seven weeks. However, you'll only be offered an early scan if you're experiencing problems, such as pain or vaginal bleeding. In most cases, this will be combined with a blood test for increased accuracy. In your second trimester you'll be offered an anomaly scan between 18 weeks and 21 weeks. Although it's great to have that first photo to keep and share, the purpose of the scan is to check how many babies you're carrying, and whether they're developing normally.Your first scan won't be able to tell you the sex of your baby just yet.

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