Ultrasounds and dating pregnancy

There are basically seven different ultrasound exams, but the principle process is the same.The different types of procedures include: Transvaginal Scans – Specially designed probe transducers are used inside the vagina to generate sonogram images.The LMP is used because most women know when their last period was, but may not know when they actually conceived.If you do know the conception date, this is classed as day 14 and not day one.If you have an irregular cycle, or if you've recently been taking the contraceptive pill, working out the date from your LMP isn't a very accurate method.Ultrasounds are more accurate than using the LMP and, if the ultrasound date differs from your period dates, the ultrasound date will be used.

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The length of your pregnancy is calculated from the first day of your last menstrual period (LMP), even though you don't actually conceive until 14 days after your LMP, and later than this if your cycle is longer than 28 days.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.However, you can use various factors and knowledge about reproduction to help narrow down the date to within one to five days if your cycles are regular.The accuracy of estimating your date of conception depends on several factors about your menstrual cycle and ovulation, as well as facts about the egg and the sperm.

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