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Doctor insights on: What Is More Accurate Measuring A Baby Or Lmp

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If LMP and first trim scans all point to same EDD, is the conception date range accurate?

If LMP and first trim scans all point to same EDD, is the conception date range accurate?

Yes: If your dates and ultrasounds are consistent the estimated conception date should be reliable within a few days. Short of tracking ovulation with daily ultrasounds or one of the in vitro methods, that is the best we can do. ...Read more

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Babies can measure too big or too small, does that cause your LMP date to be off? Or make it seem as if you're further along than you thought?

Babies can measure too big or too small, does that cause your LMP date to be off? Or make it seem as if you're further along than you thought?

LMP date could cause: You may have recalled your last period date (lmp)incorrectly and then your due date may not be accurately calculated. You may have gestational diabetes and that can cause a fetus to grow larger more rapidly than it should. You may have decreased blood flow from the placenta to the fetus ( like from smoking) and this can decrease the rate of growth of the fetus. ...Read more

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My LMP was dec 15. I had intercourse dec 20, 21, and 22 then with an ex on january 22. I'm due sept 21. Who its more likely to my babies father ?

My LMP was dec 15. I had intercourse dec 20, 21, and 22 then with an ex on january 22. I'm due sept 21. Who its more likely to my babies father ?

Difficult to say: More likely the dec partner, but timing should have been up to a week before ovulation...Which "might" still result in pregnancy. Jan date should give a october edc. May get better estimation of conception with later pregnancy ultrasound, particularly if due date shifts. Or will need paternity testing. ...Read more

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31 week us baby is measuring 1 week and 4 days ahead. Is this normal? Both earlier us matched LMP to the day. Does this change conception or lmp

31 week us baby is measuring 1 week and 4 days ahead. Is this normal? Both earlier us matched LMP to the day. Does this change conception or lmp

No change: At 31 weeks, your due date is very firmly established and wouldn't change. What can change, of course, is the baby's growth. And it sounds like you're baby is growing well. It's possible if you or your husband (or both) are taller or bigger people, that your baby is just on the larger end of spectrum. Sometimes, if mom has diabetes, there can be macrosomia. Speak with dr. So you know diagnosis. ...Read more

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Do ultrasounds add two preconception weeks when measuring baby? If baby measures 12 w is this supposed to date to LMP or conception?

Yes. LMP.: The gestational age (number of weeks pregnant) stated in the result of the ultrasound already added the 2 preconception weeks. If the ultrasound dating says 12 weeks gestation, that means 12 weeks since the estimated start of the last menstrual period (lmp). ...Read more

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By LMP I am 7w4d today. U/s 2 weeks ago told me turning 5w. Only sac, baby barely visible. Today, fetal pole and hb but baby measuring 5w6d. Problem?

By LMP I am 7w4d today. U/s 2 weeks ago told me turning 5w. Only sac, baby barely visible. Today, fetal pole and hb but baby measuring 5w6d. Problem?

Very early US dating: Not as good as us between 7-13 weeks. Measuring the fetal length (called a crown rump measurement) is the most accurate. The good news is interval growth, including a fetal pole with cardiac activity. Another followup us in 3-5 weeks could confirm additional interval growth and measure the crown-rump distance to re-evaluate dates. ...Read more

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Aug 7th Scan says 12 w 4 d. no lmp to go off. whats accuracy in telling me proper age of baby? and is that from conception?

Aug 7th Scan says 12 w 4 d. no lmp to go off. whats accuracy in telling me proper age of baby? and is that from conception?

Quite accurate: A prenatal dating scan at that part of the pregnancy is quite accurate. All dates are estimates, and in this case, conception would be about 2 weeks after the official start date. That means conception would be 10 weeks and 4 days ago, plus or minus one week. In general, the exact conception date is not important and is never known with certainty, with a "natural"pregnancy. ...Read more