Accuracy of dating sonograms
But the accuracy of the prediction by ultrasound keeps decreasing as the pregnancy progresses.
Hence the earlier the ultrasound is done, the more accurate is the predicted due date of delivery.
A marginal difference is found when cases of foetal ultrasound and menstrual history of the patients are compared.
Ultrasound has proven to be a useful test when the menstrual history is unknown, and one can safely calculate the expected date of delivery (EDD) by an ultrasound.
So, in the later stages of pregnancy, ultrasound measurements are invaluable in evaluating the baby’s growth over a period of time.
Ultrasound is painless and risk-free, and seeing the baby on the screen is also an enjoyable experience.It has commonly been observed that throughout pregnancy, each ultrasound shows a different due date.Early pregnancy scans are more accurate than the latter ones for predicting the due date.After the first six weeks of the confirmation of pregnancy, the due date can be known by an ultrasound scan.Ladies, who want to be sure of their date of delivery, cannot rely entirely on the manual cervical check – a manual checking done by the doctor to feel the softness and length of the cervix with the finger to determine the date of the delivery.
As the baby keeps getting bigger in size, differentials start happening thus making it much harder to be accurate. They are used to document and reassure appropriate and adequate growth of the foetus as well as foetal health.