Pregnancy dating scans how accurate

Ask your GP if you want to have one anyway for extra reassurance, as she may be able to refer you.Dating scans are the most accurate way of predicting your due date.However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. The rhetoric of "natural" in natural childbirth: childbearing women's perspectives on prolonged pregnancy and induction of labour.You may know when your LMP was, but not when you actually conceived. Soc Sci Med 59(7): 1397-408 Heo I was given the 23rd of january as my due date however based on the fetus age from scan I'm 24 1 day preganant which wpuld make my due date the 6th of January not the 23rd when counting 38 weeks from conception. Does a dating scan date a pregnancy from around about the day of conception?Most units offer a screening test for Down's syndrome at the same time as the dating scan. If you do have a screening test, you'll be offered the dating scan first. National Collaborating Centre for Women's and Children's Health. The screening test needs an accurate due date to be reliable, as hormones in your blood vary according to your stage of pregnancy. A blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant. Antenatal care: routine care for the healthy pregnant woman.

The sonographer will put some gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby. Stockport NHS Foundation Trust Patient Information Leaflet NHS Scotland.

The scan will usually show that your pregnancy is less far along than suggested by your LMP.

This means that accurate dating reduces your chance of having your labour induced because your baby is thought to be overdue.

Your doctor will offer you a nuchal translucency (NT) scan. National Institute for Health and Clinical Excellence, clinical guideline 62. Multiple pregnancy: The management of twin and triplet pregnancies in the antenatal period.

This measures a collection of fluid under the skin at the back of a baby's neck. Antenatal care: Routine care for the healthy pregnant woman. National Institute for Health and Care Excellence, guideline CG129. National Down's Syndrome Screening Programme for England.

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For most mums-to-be, the first scan will be a dating scan at between 10 weeks and 13 weeks plus six days of pregnancy.

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