Accuracy of dating pregnancy with ultrasound

Sometimes the results of a first trimester scan may be inconclusive or uncertain, and need to be combined with your clinical history and blood tests (serum Bh CG).Some women need to return for another ultrasound scan a few weeks later to assess the progress of the pregnancy, or they may require another blood test (serial serum Bh CG).The probe is then gently inserted a short distance into the vagina.All transvaginal probes have been cleaned and sterilised according to recommended protocols.If your bladder is very full and painful, you should empty a small amount so you are more comfortable.You will be able to empty your bladder after the transabdominal ultrasound is completed and before the transvaginal ultrasound begins (if transvaginal ultrasound is required).

We realise this is often an anxious time for parents, while they wait for the next ultrasound to check on their baby.A small amount of ultrasound gel is put on the skin of the lower abdomen, with the ultrasound probe then scanning through this gel.The gel helps improve contact between the probe and your skin. It involves scanning with the ultrasound probe lying in the vagina.You will always have a choice about whether transvaginal ultrasound is performed.If you have concerns about transvaginal ultrasound, please discuss this with your sonographer before your ultrasound begins.

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