How accurate are sonograms for dating pregnancy
The transvaginal ultrasound probe is thin, about 2cm diameter.
The probe is covered with a disposable protective sheath.
"Occasionally, the baby may be in a position that makes it difficult to identify certain anatomical landmarks.The gel helps improve contact between the probe and your skin. It involves scanning with the ultrasound probe lying in the vagina.Transvaginal ultrasound usually produces better and clearer images of the female pelvic organs including the developing pregnancy, because the ultrasound probe lies closer to these structures.If you have any kind of problem — you've gone past your due date, the baby's not moving much, or something just doesn't feel right — an ultrasound can tell you how things are going and even alert your doctor to a potential emergency."[A fetal well-being assessment] ultrasound looks for fetal movements, growth of the baby, position of the placenta, and the amount of amniotic fluid." An ultrasound can also act as a guide for your doctor during an amniocentesis, and can very accurately tell you if your baby is breech in the final weeks.
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Unfortunately, ultrasound technology, like most technologies, isn't perfect, especially when it comes second and third trimester dating and measurements.