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How accurate are dating scans at 14 weeks Free trail dfate chat

It will usually take place at your local hospital ultrasound department.The person performing the scan is called a sonographer.The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test".It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.

Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor or midwife to plan your care.

Knowing about twins early is also useful if you want to have screening for Down's syndrome.

This is because blood tests for Down's syndrome are not very accurate if you are having more than one baby.

But ultrasounds can also lift the lid on a few worries you might be having. The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.

The length of your pregnancy is calculated from the first day of your last menstrual period (LMP), even though you don't actually conceive until 14 days after your LMP, and later than this if your cycle is longer than 28 days.

205 comments

  1. At around 8 to 14 weeks of pregnancy, you should be offered a pregnancy dating scan. It will let you know a more reliable due date and check how your baby is developing.

  2. Jul 28, 2009. I had my first scan yesterday at what I thought was 11+4, calculated from my last period. I've been told i'm actually 14+2! Has anyone else experienced this? From reading quite a few posts, most people seem to move a couple of days not nearly 3 weeks. Can it be right/how accurate is the dating scan?

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