For transvaginal ultrasound you can have an empty bladder Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.For example if you a tiny sac can be seen in the uterus, but the baby and its heart beat may not be detected yet.The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.
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.
5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!
) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).
However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.
Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.
Oh and she wrote on my notes that i would be 13 weeks on 18th july, which was 8 days after my scan when i was apparently 11 3!
is getting serious, he would have to perform some other tests to.
i'm trying to understand because i haven't seen a 3-d scan, what it tells the parents?
of ordering a scan at 18-20 weeks on a routine basis.!
the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.