Top Answer
User Avatar
Wiki User
Answered 2006-03-05 00:12:21

At 7 weeks an ultrasound is accurate within 2 or 3 days. At 20 weeks it is accurate within 5-7 days.

User Avatar

Your Answer


Still have questions?

Related Questions

How accurate are ultra-sounds in determining heartbeat?

Ultrasounds are very accurate when it comes to a heartbeat. 99.9 percent

Are ultrasounds always accurate?

NOO not always

What job deals with determining if a fetus is developing properly and or conducting ultrasounds?

An ultrasonographer or ultrasound technician.

How accurate is ultrasound on how far along you are?

The farther along you get, the more accurate the ultrasounds get, but usually, they are pretty accurate from the beginning. It just depends on how far along you are when the ultrasound is done.

Which method of determining turn ratio is more accurate and why?

Which method of determining turn ratio is more accurate and why?

Is the lovecalculator accurate in determining true love?


How accurate are ultrasounds at 16 weeks?

Not 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!

Are ultrasounds accurate when it come to measuring the baby?

i think its not accurate because i dont think that stick thing that they rub on ur stomache with can tell how long the baby is or how big the baby is

Why are renal ultrasounds performed?

Why are renal ultrasounds performed?

If your due date is September 25 when was the baby conceived?

Around Christmas time is about as accurate as you can say.

If an ultrasound says you are 25 weeks 4 days pregnant when in fact conceived 25 weeks 2 days what date should be relied on?

If you know when you conceived you should always go by your date. Ultrasounds, especially later in pregnancy, are not as accurate. Here are the dates that they can be off. The inaccuracy of ultrasound First trimester: 7 days 14 - 20 weeks: 10 days 21 - 30 weeks: 14 days 31 - 42 weeks: 21 days

I have a friend?

what was her age anyways?? One thing you need to realise with ultrasounds and determining the age of the fetus is the size of the fetus. Either their dates are correct and your friend fell pregnant after the 15th or she fell pregnant around the 15th and the size of the fetus is a little smaller than average at that age and they are going by that. Get me? ultrasounds are not accurate, especially very early in the pregnancy. So they are saying she fell pregnant around sept 28 because of the size of the fetus and the average a fetus is at that age. Hope this helps.

Could conception have occurred three weeks earlier than 2 first trimester and 2 second trimesters ultrasounds say?

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.

What is the name of the people who do ultrasounds?

The folks who do ultrasounds are generally called ultrasound technicians.

How accurate is a fuel gauge in determining when one would run out of gas?

The fuel gauge in a car is fairly accurate when determining when one will run out of gas. The fuel gauge is a little inaccurate when there is very little gas left in the car.

After miscarriage and 0 hcg Does it make it hard for pregnancy tests to read accurate?

Hello, If you have 0 HCG in your blood, and if you conceived after this then a pregnancy test would be accurate. A pregnancy test will not be accurate if you have any HCG in your blood.

Will you miscarry if an ultrasound at 7 weeks 5 days only said 5 weeks 5 days and there was no heartbeat?

If there is no heartbeat, then I am afraid you will miscarry. Ultrasounds are usually accurate.

Can a doctor tell whether you are 7 or 10 weeks and be positive?

Yes, with an ultrasound. They can measure the baby and give you a very good date based on that. Ultrasounds are very accurate

Does planned parenthood do ultrasounds?

This company will do ultrasounds. I don't think they charge you for this service. They will give you an appointment.

What is the name of people who do ultrasounds on pregnant woman?

the people who do the ultrasounds for pregnant women are called ultrsonographers.

Are ultrasounds accurate when you do remember your last period?

Yes, I remember my last cycle and I estimated my own due date to be Aug.8 well when I had my ultra sound it said Aug.5 so if not very accurate its very close... Good luck.

What were three methods of determining latitude and which one was the most accurate?

The latitude and longitude of that point is known as the celestial body's geographic ... (Two other common methods for determining one's position using celestial ... The sextant and octant are most accurate because they measure angles.

How accurate is an ultrasound if you do not remember your period?

If you do not remember the date of your last period you can have an ultrasound to determine your due date. More than one ultrasound throughout your pregnancy may be required because ultrasounds are not always accurate. They could be out as little as a couple of days by a matter of weeks.

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.

When accessed individually is the femur bone slightly less accurate in determining the height than the humerus bone?