How is the scan performed? To obtain the best images possible, this scan is routinely performed internally and perfectly safe to perform during early pregnancy.

Are dating ultrasounds transvaginal?

How is it done? Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.