When is a dating scan usually done?Ī dating scan is done between 8 and 14 weeks of pregnancy (and usually between 8 and 12 weeks), when most babies of the same gestational age are about the same size. If you think you may need a dating scan to help estimate when your baby is due, speak to your doctor or midwife. This may not be so simple or accurate in other situations, like if you have long or irregular cycles, don’t remember when you had your last period, or if you got pregnant while taking contraception that affected your cycle. Women with a regular 28-day cycle can calculate an estimated due date for their baby by counting 40 weeks from the first day of their last menstrual period. That’s why people often talk about pregnancy lasting for 40 weeks. Since many women ovulate (release an egg that may then be fertilised) and conceive about 2 weeks after their last period, this is often about 40 weeks since the beginning of their last period. Most babies are born about 38 weeks after conception. Knowing how far along you are is also important if your baby is born prematurely, or if you haven’t given birth by your estimated due date and you're thinking about having your labour induced. It’s important to have an accurate estimated due date (or EDD) for your baby so you can have the recommended tests at the right time. Not everyone needs a dating scan, but they can be very helpful if you aren’t sure when you conceived. A dating scan measures your baby and this helps your doctor estimate how long you have been pregnant, and when your baby is due. In early pregnancy, most babies of the same gestational age are about the same size. Related information on Australian websitesĪ dating scan is an ultrasound scan done between 8 and 14 weeks of pregnancy to help estimate your baby’s due date.
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