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Scientists use Carbon dating for telling the age of an old object, whose origin and age . We know for a fact that the amount of Carbon in the atmosphere has not.

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Ultrasound can tell you how many weeks pregnant you are, based on the size of your fetus. Dating ultrasounds are most accurate when they happen at or after the first seven weeks, in the first trimester.

What types of ultrasound are there?

Knowing where you are in your pregnancy is important for your prenatal care, all the way from your first trimester, through to labour. This ultrasound is usually done between 19 to 20 weeks of gestation.

The ultrasonographer will take many measurements of your baby. The position of your placenta and the vessels in the umbilical cord will be examined. The amount of fluid around the baby will be measured. We use cookies to improve functionality and performance.

First Trimester / Dating Ultrasound | Advanced Women's Imaging

Some centres may charge extra for a photo CD. Nuchal Translucency Ultrasound must be done between 11 and 13 weeks, six days. If you choose to have this scan it needs to be done between 11 and 13 weeks to screen most accurately for any chromosome abnormalities, in conjunction with a blood test.

There are some out-of-pocket costs associated with this scan, although a portion of it is covered by Medicare. The good news is, by this time external ultrasound is usually sufficient to see the baby, but the sonographer will still have to press down quite hard with the transducer to get a good picture. This scan is definitely worthwhile, as by 12 to 13 weeks your baby looks much more like a baby. I could see my baby rolling and waving her arms.

Depending on your centre, there may or may not be a monitor visible to you. One in 1, or higher is considered low risk. An average length of the embryo at 7 weeks is anywhere between 5mmmm. The average weight is less than 1 gram.

Your pregnancy and baby guide

Obviously, every pregnancy is unique and individual factors influence the size of the embryo at this early stage, and the embryo shows development week by week. The ideal time for a sonographer to assess the gestational age in the first trimester is between weeks of pregnancy.


This is the period of time which provides the most accurate assessment. Generally, ultrasounds which are performed in the first trimester are within days of being accurate in terms of assessing gestational age. This is because although every little embryo is unique, there are still defining characteristics of development which apply to all embryos at particular stages of early gestational development.

First Trimester / Dating Ultrasound

As the embryo matures to a foetus, individual genetics and growth factors influence its growth. This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery. With maturity, the size of the baby correlates less to its age than in the early weeks.

There are two ways of having a seven week ultrasound. One is via the abdomen β€” transabdominally and the other is through the vagina β€” transvaginally.

How is an ultrasound performed?

Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation. With this form of scan it is not as necessary for the mother to have a full bladder.

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Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim. In very early pregnancy, the embryo and pregnancy sac may simply be too small to see very much at all.