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How accurate is a transvaginal ultrasound at 6 weeks in determining conception dates?
Wiki User
∙ 14y ago
An ultrasound does not determine the date of conception it compares the size of your baby with the size of other babies at the same stage of pregnancy. It said my first was smaller than I expected, about a week out, but he was born on the date the scan suggested weighing over 8 pounds. With my second (twins) it was spot on, they were born 4 weeks early, one of average weight and the other rather small. with an ultrasound it determines your due date due to the size. go to your last period, and minus 2 weeks. say you are due on the 30. minus 7 days, which should be the beginning of your last period. since your last period, on the first day is 2 weeks from ovulation, minus 14 days. now the day is the 9th. 5 days before and sometimes 1 day after is when you are fertile. that is your conception area. 30rd - 7days = 23rd - 14 days = 9th. this is the day you ovulated. From the 5th to the 10th you were fertile.
Wiki User
∙ 18y ago
Wiki User
∙ 15y agoNot very accurate yet, your best bet is to wait until about 20 weeks to get a accurate ultrasound
Ultrasounds are always most accurate in the first trimester of pregnancy, within about 3-5 days, in the second usually off by 7-10 days after 20 weeks could be off by 2 weeks and in the third it could even be as much as 3 weeks!
Wiki User
∙ 16y agoIf the radiologist is competant enough, ultrasound can be 99% accurate.
Wiki User
∙ 13y agoVery. However dr's and nurses are human and do make mistakes but it is rare.
Wiki User
∙ 11y agoCurrently it is pretty reasonable, although not exact. I would give a fudge factor of a week one way or the other, particularly if you weren't having sex frequently.
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Judging by an ultrasound at 8 weeks im due on March 14 which means i concevied on June 21. how accurate is the conception date i was with someone on June 14 and then with someone else the 17-22?
your conception date should be pretty accurate considering u had an ultrasound. you shouldv'e been ovulating around June 21st.
How accurate is the ultrasound due date?
They are accurate within 2 or 3 days. But this does not mean that you will have the baby on your due date. Babies can be born any time between 37 and 42 weeks. That is what midwives are taught anyway. With my first my ultrasound said I was due 10 days after my period date but my husband had been away on a trip form the day after conception! Second time around the ultrasound agreed completely, and showed twins. (now 16) == Your last known period date or the date of conception is a better predictor....as all babies are different & you may have an extrememly large or an extremely small baby for it's gestational age, and when compared against babies in the "norm" the due date could be way off.
When it says that an ultrasound is most accurate at 12 weeks does that mean gestational age or the time since LMP?
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.
Is the EDD given to you on your scan date from your LMP or by the date of conception?
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.
Can your conception date change if you give birth after due date?
A conception date can never be 100% accurate
Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?
Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?
Which method of determining turn ratio is more accurate and why?
Which method of determining turn ratio is more accurate and why?
Is an ultrasound in the 4-6th week of pregnancy the most accurate?
You ussally dont get a ultrasound till 4 mounths
Is the lovecalculator accurate in determining true love?
No.
How far off can an ultrasound be?
It depends on the level of the sonogram and its purpose. Looking at veins and things of that nature, they're reliable. When it comes to determining a baby's size - they'll give you a decent range ... but they are not very accurate nor can they be fully reliable.
What are the release dates for The Golden Girls - 1985 The Accurate Conception 5-3?
The Golden Girls - 1985 The Accurate Conception 5-3 was released on: USA: 14 October 1989
Can your last menstrual period show twenty three weeks but your ultrasound show twenty seven weeks which is more accurate?
ultrasound is more accurate. Measurments of the fetus are made during ultasound that give a more accurate gestational age
