nzdating co za - Pregnancy dating scan accuracy
Of all of these uses, dating the pregnancy is the most common reason to use ultrasound, particularly when the expectant mother cannot remember the date of her last period (as in breast-feeding or irregular cycles).
This scan can be carried out from 6 weeks to 18 weeks.
The most accurate time to date you pregnancy is after 8 weeks through to 13 weeks.
Before twelve weeks, it’s difficult to measure much more. In the second trimester, (past the first 12 weeks), the other measurements can be added.
Most babies, except in cases of early IUGR and deformities, grow about the same until 20 weeks or so.
Baby is now measure 45mm and clearly has a distinguishable head, body, arms and legs.