I go by the LMP, but even then I had mine early.
The earlier it is the more accurate it is whether from conception or from LMP, but if you say 12 weeks you mean from LMP.
Confirmatory Value
The earlier and ultrsound is performed the more accurate it is. Usually around 7 weeks. But any time in the first 20 weeks is accurate to within 5 days. After this babies weights start to vary too much the estimate to be as accurate.
EDD is ESTIMATED. If done by scan is 38 weeks from conception. An EDD is based on the LMP (last menstrual period) and not the date of conception. The ultrasound measurements are comparing the baby to the expected size of other babies at the same gestational age. The earlier the ultrasound is done in the pregnancy, the more accurate it will be. Hope this helps! Dr. B.
No. If four ultrasounds all give the same date then that is accurate to about 5 days. Even one first trimester ultrasound would be sufficient.
The best person to ask is the person doing the ultrasound. Having said that here are a few guidelines. Ultrasounds can give you a fairly accurate time for the length of the pregnancy. Before 10 weeks the measurement taken is crown-rump length, from the top of the head to the bottom of the spine. This is accurate to within 3-4 days. After about 12 weeks several measurements are taken, head circumference, head diameter and abdominal diameter as well as femur length and the results are plotted on a graph to compare with the estimated length of pregnancy. The earlier the measurements are taken the more accurate they are in assessing the length of the pregnancy.
Usually a doctor wants to see you for the first ultrasound when you're appr. 10-13 weeks pregnant.
Yes. The obstetrician can use the images from the ultrasound screening to date a pregnancy. The size of the fetus, placenta, and/or your uterus are some of the factors used to determine how far along you are in your pregnancy. However, scans performed earlier on in the pregnancy are generally more accurate than those performed later, since in the later part of pregnancy the measurements could be affected by growth variations and may not correctly reflect the fetal age.
Generally from the ultrasound, when there is more than one baby. However, before the ultrasound there can be some indicators, such as pregnancy symptoms being stronger than normal or your abdomen getting bigger earlier on in the pregnancy than it usually would
This is essentially a normal kidney ultrasound. A mild cortical echogenicity in both kidneys, and normal renal function can occur in pregnancy when your over-all blood volume is increased.
'A while ago' means just that--a short time earlier.'Earlier' may mean a short or relatively long time ago.
There is a 1 hour time difference, with Mexico being the earlier one.