Dating scan accuracy
The transvaginal ultrasound examination doesn’t require a full bladder and uses a probe that is only approx. The probe is covered with a clean, protective disposable sheath before it is gently inserted into the vagina to obtain pictures of the pelvic organs and the developing pregnancy.
These images are often clearer as they are closer to all of the structures.
This scan is recommended between 18 and 19 weeks of pregnancy.
It is a combined transabdominal and transvaginal scan and is an examination for fetal abnormalities prior to 20 weeks gestation.
Many long term studies have been undertaken on the safety of ultrasound in pregnancy and post birth.
None of the properly conducted studies have described a significant adverse effect on either mother or baby and childhood follow-up studies have shown that ultrasound scanning in utero does not adversely affect long term growth or cause developmental delays.
Hard tissue such as bone give a strong echo and appear white in the image.A risk rating for chromosomal abnormality is then calculated using some main variables: The report then gives a risk rating calculated for Trisomy’s 13, 18 & 21. However, a low risk result is reassuring that the baby is healthy.A high risk result does not always mean the baby definitely has a chromosomal problem. However, detection is improved by combining the ultrasound features and serum protein markers, with approx.This is a guide to ultrasound scans and their significance for early pregnancy.Ultrasound scans send high frequency sound waves through the uterus to allow us to assess pregnancy and fetal wellbeing.