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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.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoAbout a week maximum. Normally though, they are accurate to 1 day.
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How do you know how far you are?
Ultrasound
Can an ultrasound be off by a week?
yes
Can an ultrasound be a week off?
yes
What numbers on ultrasound tells how many weeks pregnant you are?
Most ultrasound machines don't list how far along you are on the pictures that are printed. The technician that is running the machine can have the computer calculate the age of the fetus using measurements.
How far along in the pregnancy do you have to be to get an ultrasound on howrse?
8 Months
Are one application of ultrasound?
Ultrasound can be used to clean dirt off item placed in a water bath with a powerful ultrasound transducer clamped to the side of the vessel.
Who hears ultrasound?
No one is able to hear ultrasound; the frequency of the sound used is far higher than the audible limit of any person or animal. A sonographer will conduct an ultrasound. Ultrasound in the same way that bats navigate - by listening to echos. ultrasound is reflected in propotion to the density of soft tissues. an ultrasound displays the results of these echos.
I Should be 7 weeks but ultrasound says 6 could my due date be off?
It is unlikely that they would be that far off. They're often off by a couple of days or weeks, but not usually 1 1/2 months off. I strongly suggest that you speak to your doctor about it for more information.
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.
Can an ultrasound at fourteen weeks be off by two weeks?
Yes
Is defined as giving off few echoes in an ultrasound?
hypoechoic
Uses ultrasound wave that reflect off of boundaries?
sonar
