Dating pregnancy ultrasound vs lmp
When you have a repeat ultrasound it should be able to give you more accurate measurements.The most important thing right now is you have a nice healthy heartbeat.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.Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy.In order to use Medscape, your browser must be set to accept cookies delivered by the Medscape site.
Try not to stress (it's hard I know) but you have a lovely healthy heartbeat and that's the main thing..
If an ultrasound date in the first trimester differs from your LMP date by seven days or more, we would go with the ultrasound.
If the ultrasound date is within seven days of your LMP date, we would stick with your LMP date.
With this pregnancy, my dating ultrasound put me a week ahead. The heartbeat was 155 I'd I was only 6.5 weeks the heart rate should have been 120-130. And the baby wasn't as clear on the ultrasound.
By LMP I was 8w 6 but the tech said 9w 6, which I think is correct because I'm positive I ovulated really early in my cycle. My cycle was usually 28days but had been thrown off a bit from a miscarriage in December.