Question 1

how well is conception date accuracy with ultrasound at 12 weeks? my lmp started on nov.28, 2011 lasting five days. i had an ultrasound on jan.17, 2012 counting me at 7 weeks and 1 day, then another ultrasound on feb.21, 2012...counting me at 12 weeks exa

Accepted Answer

The : The ultrasound dating now is remarkably accurate.  There can be discrepancies in the dates that the patient has from the date of menstrual period, but the ultrasound dating is remarkably accurate based on the "crown rump length" of the fetus, which is the measurement of the baby from the crown of the head to the tip of its bottom, the development of the heart, and other vital organ which can already be identified by ultrasound dating.  A 12 week ultrasound date should be very accurate.

Question 2

ultrasound at 12 weeks showed nuchal translucency was 4mm. what does this mean?

Accepted Answer

Nuchal Translucency : Nuchal Translucency is a screening test to determine risk of chromosome abnormalities in a fetus. When the NT is greater than 3.5 mm, there is a 1 in 5 chance of a chromosome abnormality such as Turner or Down syndrome, or Trisomy 18. Additional tests should be ordered by an OB or genetic counselor for confirmation. A mother may decide to continue or end of the pregnancy based on the information.

Question 3

can an ultrasound at 12 weeks be off by 3-4 weeks? if u were 12 weeks, and its showing measurements of 8-9 weeks than your due date would surely change

Accepted Answer

Yes.: Your due date will change during the first trimester if the difference between period and  ultrasound is more than 1 week.

Question 4

i'm due aug 30th according to ultrasound at 12 weeks, 1st ultrasound at 6 weeks said due date aug 29th, my lmp nov 18 need my conception date range :)?

Accepted Answer

US dates: The ultrasound dates are most accurate. If the us at "6 weeks" estimated that the baby was actually 6 weeks. You likely conceived about 4 weeks before that date.

Question 5

ultrasound at 12 weeks. baby looked healthy. what are the chances of miscarriage after this?

Accepted Answer

Unlikely: Most miscarriages occur in the 1st trimester. As long as there are no other risk factors unlikely. All the best.

Question 6

i am 12 weeks and ultrasound tech didn't locate kidneys?

Accepted Answer

12 weeks: 12 weeks is still early for a formal anatomic scan, so this isn't necessarily cause for alarm. In a general OB office the techs' skills with early ultrasound also vary alot. At 15-16 weeks in a perinatal specialty office, not seeing kidneys is very serious.

Question 7

can 12 weeks pergncey hide and not show in ultrasound not even a sac .or not even in blood work .

Accepted Answer

No: You'll be able to see the baby in ultrasound in the uterus and have a pos hcg.

Question 8

at 12 weeks the ultrasound technician saw that my fetus has penetrated the empty sac of the vanishing twin.how could this be?

Accepted Answer

Good question: I am not sure what the ultrasound technician may have meant if he/she really stated the surviving fetus has penetrated the empty sac of the vanishing twin. If he/she is implying that the membranes of the vanishing twin are somehow wrapping around the surviving fetus, then this is a situation that you would want to have clarified by a Maternal Fetal Medicine specialist. Discuss a referral.

Question 9

according to ultrasound i am 12 weeks today(june 15,2014)  but i'm sure my lmp was march 5,2014. how could i be 12weeks? when was conception?

Accepted Answer

It's an estimate.: Re: your last question, if you're SURE your LMP was Mar. 5, 2014, we can estimate that conception was on Mar 19. Re: your ultrasound, it is important to understand that the age of your fetus is obtained by taking measurements. An example would be femur length. When these measurements are collated, an estimated fetal age can be obtained and it may vary from your dates.

Question 10

went for an ultrasound that measured my baby at 14 weeks 2 days the doctors told me they are using a due date which predicts i'm 12 weeks which is right?

Accepted Answer

Ultrasound dating: Your ultrasound dating should not be more than 1 week off from your due date at this point in your pregnancy.  Assuming this was your first ultrasound you should talk with your doctor about whether or not she wants to change your due date.

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Doctor answers about:

Ultrasound at 12 weeks boy

A member asked:

How well is conception date accuracy with ultrasound at 12 weeks? my lmp started on nov.28, 2011 lasting five days. i had an ultrasound on jan.17, 2012 counting me at 7 weeks and 1 day, then another ultrasound on feb.21, 2012...counting me at 12 weeks exa

A member asked:

Ultrasound at 12 weeks showed nuchal translucency was 4mm. what does this mean?

A member asked:

Can an ultrasound at 12 weeks be off by 3-4 weeks? if u were 12 weeks, and its showing measurements of 8-9 weeks than your due date would surely change

A member asked:

I'm due aug 30th according to ultrasound at 12 weeks, 1st ultrasound at 6 weeks said due date aug 29th, my lmp nov 18 need my conception date range :)?

A member asked:

Ultrasound at 12 weeks. baby looked healthy. what are the chances of miscarriage after this?

A member asked:

I am 12 weeks and ultrasound tech didn't locate kidneys?

A member asked:

Can 12 weeks pergncey hide and not show in ultrasound not even a sac .or not even in blood work .

A member asked:

At 12 weeks the ultrasound technician saw that my fetus has penetrated the empty sac of the vanishing twin.how could this be?

A member asked:

According to ultrasound i am 12 weeks today(june 15,2014) but i'm sure my lmp was march 5,2014. how could i be 12weeks? when was conception?

A member asked:

Went for an ultrasound that measured my baby at 14 weeks 2 days the doctors told me they are using a due date which predicts i'm 12 weeks which is right?

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