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Ultrasound accuracy dating conceive

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The body is not on a clock counting down to delivery; natural variation will introduce uncertainty.

Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.

Examples include if you have irregular menstrual cycles or long menstrual cycles, or if you became pregnant directly after a miscarriage or after extended breastfeeding without menstruating.

“Exercise extreme caution with regard to last menstrual period (LMP) on history taking.

Plus, remember that you pregnancy is dated based on your last period, not conception.

So if you are 8 weeks pregnant, you technically conceived 6 weeks ago, not 8. They just said my baby was 6 days ahead from what my first ultrasound said.

One reason for not dating pregnancies from the day of conception is that we cannot know that day exactly (excluding cases of assisted reproduction), but we can know the first day of LMP, based on what a patient reports to us.Summary statistics for GA using each reference method were determined (n = 131).Correlation between GA determined by ultrasound and ovulation day was excellent (maximum difference 10 days); however, pregnancies dated by ultrasound were 3 days advanced.even though they said my baby was 6 days ahead my conception date doesnt change? The date of my last period was November 28th which would make me 25 weeks 4 days.The difference between LMP estimates and estimates based on ovulation day or ultrasound was 9 and 12 days, respectively.