Question 1

how accurate is an ultrasound's conception date/due date?

Accepted Answer

The margin: of error for ultrasound pregnancy dating is about 8%.

Question 2

conception query could someone i had sex with 2 weeks before my partner be the father of my child? due date, all ultrasounds, conception calculators match up to the date me and my partner had intercourse, give or take 2 days?

Accepted Answer

: The only worthwhile answer &amp; one that will hold up in court proceedings will be a DNA based paternity test. The NIPP is a non-invasive test performed on your blood as early as 8 weeks. They find fetal DNA in your blood &amp; can test it for a variety of things including paternity. Ultrasounds and projected dates can give data, but a surprise at delivery is not worth a wrong call.

Question 3

how does an ultrasound determine conception?

Accepted Answer

Look for intrauterin: Intrauterine sac; which by 5-6 weeks post last menstrual period (lmp) should show a fetus, with a detectable heartbeat.

Question 4

according to my 8 and 12 week ultrasounds my conception date is january 5? how accurate is this and how many days can it be off ?

Accepted Answer

Pretty accurate: First trimester ultrasound can accurately date pregnancy to within 4 or 5 days, so your conception date is likely between jan 1 to jan 10.

Question 5

my due date is aug 7 according to 11 week ultrasound and 24 week ultrasound. what is the accuracy of these ultrasounds and conception day?

Accepted Answer

+/- 1 week: The accuracy of an 11 week ultrasound should be +/- 1 week.

Question 6

what do dating ultrasounds date? conception, lmp, or due date?

Accepted Answer

All : All if those can calculated after obtaining the gestational age.

Question 7

what is the lowest number of days to be able to identify twins on an ultrasound after conception date,thankyou?

Accepted Answer

4-5 weeks, depends.: It depends on what type of twins (monozygotic / identical or dizygotic / fraternal) &amp; where the implantation occurs, so there's no hard-and-fast rule. I've heard of twins being seen at 5 weeks based on two different heart beats heard on US. It can be seen as soon as 4 weeks if they are separated far enough for US to see. Either way, don't fret; accept congratulations &amp; best wishes to you &amp; partner

Question 8

early ultrasound set conception around dec 6. lmp nov18-ish. not really known. how likely i conceived from sex on nov 22?

Accepted Answer

Not likely.: Even if you're counting November 18-ish as the first day of your LMP, conception was very unlikely from sex on November 22.  Early ultrasound is remarkably good at determining date of conception b/c it's very detailed and b/c the process is quite predictable.  For now, you should rely on the December 6-ish date as the date of conception and the date you can use to estimate due date.

Question 9

if i had sex with two guys, one blew one didnt, ultrasound shows conception on 16th thats the guy who blew, is he most likely the father?

Accepted Answer

Probably : If you know the date of conception based on your ultrasound and you had sex on that day with one particular person then that person is the most likely father of the baby. If you had sex with the other person in the days around that date he may be the father. There are 5 million sperm in pre-ejaculatory fluid so whether it ejaculation occurred or not is not particularly relevant.

Question 10

how accurate are ultrasounds? with conception date lmp 4/25/14 30 daycycle lasted 4 days duedate 1/30/15 according to 8wk 4day ultrasound on 6/24/14

Accepted Answer

The margin: of error for ultrasound pregnancy dating is about 8%.  At 8 weeks, this corresponds to +/- 5 days.

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Doctor answers about:

Ultrasound conception

A member asked:

How accurate is an ultrasound's conception date/due date?

A member asked:

Conception query could someone i had sex with 2 weeks before my partner be the father of my child? due date, all ultrasounds, conception calculators match up to the date me and my partner had intercourse, give or take 2 days?

A member asked:

How does an ultrasound determine conception?

A member asked:

According to my 8 and 12 week ultrasounds my conception date is january 5? how accurate is this and how many days can it be off ?

A member asked:

My due date is aug 7 according to 11 week ultrasound and 24 week ultrasound. what is the accuracy of these ultrasounds and conception day?

A member asked:

What do dating ultrasounds date? conception, lmp, or due date?

A member asked:

What is the lowest number of days to be able to identify twins on an ultrasound after conception date,thankyou?

A member asked:

Early ultrasound set conception around dec 6. lmp nov18-ish. not really known. how likely i conceived from sex on nov 22?

A member asked:

If i had sex with two guys, one blew one didnt, ultrasound shows conception on 16th thats the guy who blew, is he most likely the father?

A member asked:

How accurate are ultrasounds? with conception date lmp 4/25/14 30 daycycle lasted 4 days duedate 1/30/15 according to 8wk 4day ultrasound on 6/24/14

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