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First trimester dating ultrasound accuracy

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If the ultrasound date is within seven days of your LMP date, we would stick with your LMP date.Ultrasounds done later in the pregnancy are less accurate for dating, so if your due date is set in the first trimester, it shouldn't be changed.You can calculate your due date by subtracting three months from the first day of your last menstrual period (LMP) and then add a week. A pregnancy is based on being 280 days long, which is 40 weeks (more like 10 months not 9! When we give you a due date we consider 37 to 42 weeks to be full-term, so even if your baby is born two weeks before your due date it is not considered premature.The accuracy of using your LMP to date your pregnancy depends on having regular cycles and assumes you ovulated (released an egg) on day 14 of your cycle and conceived right away - ­ none of which may be true.It is not uncommon for babies that are labeled “Large for Gestational Age (LGA)” and “Intra Uterine Growth Restriction (IUGR)” to have monthly or even weekly ultrasounds during the pregnancy.When an ultrasound is performed, measurements of the head, abdomen, thigh, and amount of amniotic fluid are done.

The first trimester is defined as the first 13 weeks of pregnancy following the last normal menstrual period (some authors refer to early pregnancy as 0-10 weeks).

These measurements are computed automatically in the ultrasound machine’s software.

The software has certain measurement scales based on data from large populations, and your baby’s measurements are put into this scale.

You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.

You can ask your midwife or doctor before the scan if this is the case. Find out more about what happens during a pregnancy ultrasound scan.