Doctor insights on:
What Is More Accurate Measuring A Baby 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
Do ultrasounds add two preconception weeks when measuring baby? If baby measures 12 w is this supposed to date to LMP or conception?
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 moreSee 1 more doctor answer
Lmp 4/25/12 & my edd is 2/14/13 at 5w. I did a new scan at 7 months and the baby measured 2 weeks ahead with an edd of 1/30. Which edd is accurate?
Go with early US: As gestational age increases the error range increases. The most accurate estimates come from 1st trimester us. ...Read more
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
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
Do babies measure on time as to when they were conceived? Thats where your edd come from or from your lmp?
Lmp: Lmp is the date we use not conception. People often think conception. ...Read more
Does crl measure the exact age of the baby from LMP or does it measure from growth in uterus once implantation occurred?
CRL: Literally crl measures neither : it relates measured size to an expected age based on normal first trimester growth. It is accurate to +/- 2-3 days (so not exact), if certain lmp or sure ovulation it can reliably estimate ga relative to either conception or lmp. Doctors always date from a known or theoretical lmp, never conception, so there is roughly 14 days difference. ...Read more
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