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How many weeks can an ultrasound be off?

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βˆ™ 2008-05-26 17:43:21

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If you are in the early stages of pregnancy &-8 weeks it will only be off by a day or two. By twelve weeks may be 3 days, 18/20 weeks 4-5 days. From then on it becomes more difficult as babies end up different sizes. Not at an early stage. Are you further on than you thought or not as far on as you thought? Give a few more details and I can tell you a bit more.

2008-05-26 17:43:21
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Related Questions

Can an ultrasound at fourteen weeks be off by two weeks?

Yes


Can a ultrasound be ten weeks off?

That's unlikely.


Can an ultrasound be off by a month in the first trimester How accurate is an ultrasound at 7 weeks?

Well I had an ultrasound at 13 weeks and it was not very accurate. and it will not be able to tell the sex of your baby. Oh by the way, depending on what kind of insurance you have and what hospital you are at you may not get another ultrasound. An ultrasound at 7 weeks is extremely accurate, within 2-3 days. At 13 weeks it will be accurate within about 5 days. It can certainly not be off by a month.


At 18 and a half weeks pregnant can an ultrasound read at 20 weeks what would be the reason Is the baby big can an ultrasound be off by 10 days?

At this stage, yes the ultrasound can be off by 10 days. Mine was off by ten days the other way, that is I thought I was 18 weeks and the ultrasound said 16 and a half. I knew when I had conceived because my husband had been away on a trip.


How many days out could a scan be?

An obstetrical ultrasound can be as much as 1-2 weeks off, before or after the due date.


My ultrasound puts me at 21 weeks preg that would mean I was feeling movement at 14 weeks took cheap home test at 3 weeks now measure 26CM and not sure of LMP could ultrasound be off by 3 or 4 weeks?

my ultrasound said that my last period was nov25 could it be right


At how many weeks is an ultrasound perform to find out baby's sex?

at 17-18 weeks.


If someone has an ultrasound and it indicates 7 weeks pregnant from conception date is it possible for the ultrasound to be off by 4 weeks and be 11 weeks pregnant?

No it is not possible to be 11 weeks instead of 7 weeks pregnant. Ultrasound is reliable for dating within a 2 week error. So it is possible for you to be 4 weeks or 9 weeks but not 11 weeks. However dating is usually based on the last menstrual period unless there hasn't been one.


Had an ultrasound scan and the result was 7 weeks 1 day at this stage in the pregnancy could the scan prediction be as much as 3 weeks out meaning that i would have been 10 weeks 1 day?

At 7 weeks it's basically impossible for the ultrasound to be that far off. It's normal to be 3-5 days off max.


Why are 2 weeks taken off your ultrasound scan age?

Because it's about 12 days of conception


Why are you measuring 34 weeks pregnant when you are only 29 weeks?

There are so many reasons I hope you will have an ultrasound to find out.


How many weeks pregnant will an ultrasound pick up a heart beat?

In 3 weeks you can hear the heart beat


What pregnancy test displays how many weeks you are?

An ultrasound can estimate how far along you are


Can a doctor be wrong about how many weeks you are in your pregnancy?

yes not until an ultrasound is done


Why I can't hear my baby heartbeat at 11 weeks pregnant with an ultrasound?

you should be able to....I heard mine on ultrasound at 7 weeks, then at 9 weeks and again last week at 10 weeks! Maybe the person giving you the ultrasound was not experienced enough to do it!


What if ultrasound doesn't detect a fetus at 5 to 6 weeks?

what if ultrasound doesn't detect a fetus at 5 to 6 weeks?


How off can an ultrasound be that estimated your last menstrual period the same at eight weeks and twelve weeks?

I think this is what you mean. For example. On 28th December the ultrasound said you were 8 weeks pregnant, then on 25th January it said you were 12 weeks pregnant. This would be accurate to within 4-5 days each time.


Can a ultrasound be ten weeks off if you think your 12 weeks and ultrasound reads your 22 weeks?

Ultrasounds are fairly accurate - a fetus at 12 weeks is very small. A 22 week fetus is fairly large. They measure how big bones are, and the distance around the head. There is no mistaking a 12 weeker for a 22 weeker.


At how many weeks in your pregnancy can you tell if the baby is a boy or girl?

At 16 weeks it is 80-90% accurate using an ultrasound


If an ultrasound on the 17th Sept said you were 14 weeks and 1 day and you conceived 11th June is there a way it could be off by 5 weeks as your midwife said you conceived in May?

i would go with what the ultrasound says as it is almost 100% accurate.


Can an ultrasound at 6 weeks be off by 5 days?

Yes, ultrasounds are not Perfect for time prediction, they do get close, but are not perfect.


How soon can a ultrasound tell if your pregnant?

You can tell you are pregnant through ultrasound as early as 4 weeks with a vaginal ultrasound.


Can you have an ultrasound at 3 weeks?

Yes you can!


When did you conceive if your ultrasound says you are fourteen weeks pregnant?

Subtract fourteen weeks (7 days x 14) from the date of the ultrasound.


Can you hear the baby heart beat at 8 weeks with an ultrasound?

You can start to hear the babies heartbeat through ultrasound as soon as 6 weeks