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How is due date calculated?

If you don't know when your LMP was and you have an ultrasound to date your pregnancy, does it date from conception to your due date (40 weeks later)??

Answer Question

Asked by Anonymous at 4:28 PM on May. 1, 2009 in Pregnancy

Answers (4)
  • If you don't know when your cycle was then you have to wait till the ultrasound and then they measure based on the size of the sack and what's in the sack. Then they calculate your due date based on gestational size. That will tell you the 40 weeks. The due date is 40 days from the first day of your LMP. The 38 weeks is the date used of when you ovulated or possibly conceived.

    Answer by lilbit022009 at 4:31 PM on May. 1, 2009

  • With an ultrasound they take measurments and they can calculate it from that.

    Answer by Anonymous at 4:31 PM on May. 1, 2009

  • You are supposed to count 2 weeks after your LMP, then count 38 wks after that. Good Luck!

    Answer by jcampos at 4:32 PM on May. 1, 2009

  • Yes. Based on measurements which are compared to average sizes of other babies, they will attempt to determine your due date which goes from conception to 40 weeks. So if your EDD from your ultrasound says your baby is 6 weeks, that means they believe you concieved 6 weeks ago and have 34 more weeks until you would be due.

    Answer by NovemberLove at 4:35 PM on May. 1, 2009

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