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Doctor insights on: Measuring Larger Than Gestational Age

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What does it mean if my baby is measuring big for gestational age?

What does it mean if my baby is measuring big for gestational age?

Depends: The average woman is around 5 ft. 3 in tall. If you had two women, one who was 5 ft 10 in tall and another one who was 4ft 11 in tall, you would not say either of these women are abnormal, just outside the average. So a baby that measure big for gestational age is outside the average. What you need to know is by how much is the baby outside the range of average. ...Read more

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Can 12 week dating scan be off by 2 weeks? Could a 10 week gestational age fetus measure as big as 5.6cm?

Can 12 week dating scan be off by 2 weeks? Could a 10 week gestational age fetus measure as big as 5.6cm?

Yes: Ultrasound scanning is related to the skill of the sonographer. Typically a 10 week scan has three days of error built in when the test is performed vaginally. There is more error with an abdominal ultrasound. Average crown rump length at ten weeks is approximately 3-4cm. ...Read more

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If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

12+4 weeks: Crown-rump length in fetus: 57 mm= 12+2 ( 50%) weeks, 62mm= 12+4 (50%) weeks reference: http://www.Bmus.Org/policies-guides/23-17-3-161_ultbmus.Pdf. ...Read more

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When a fetus is "measuring small" how is that determined? Wouldn't it just mean that the fetal / gestational age is off?

When a fetus is "measuring small" how is that determined? Wouldn't it just mean that the fetal / gestational age is off?

Yes and no: Yes, if the gestational dates are off. No, if they are not and the biparietal diameter of the fetus does not "measure up" to the appropriate age indicating "small for gestational age or intrauterine growth retardation.". ...Read more

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Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?

Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?

Accurate: A first trimester ultrasound is highly accurate. They are measuring what is called a crown (top of the head) rump (bottom of the bum) length. The length is compared to average size embryos to come up with a gestational age. ...Read more

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The doctor is saying that my gestational sac is measuring too small and the baby is too big for it i am 8 w 2 d does that mean miscarriage?

The doctor is saying that my gestational sac is measuring too small and the baby is too big for it i am 8 w 2 d does that mean miscarriage?

Heart beat ?: The most important thing to find out was if there was a fetus with a heartbeat visualized on the sonogram located inside of the uterus. If so then this is good news. The size of the gestational sac is not likely to be a contributory data point if the rest is true. You can ask your doctor to explain what was meant by a small gestational sac ...Read more

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Before I miscarried my ultrasound read: Gest Sac: 29 mm 8w 0d CRL: 4 mm 6w 1d +/- 0w 4d Could I have a COMPLETE molar pregnancy? Or is only partial an option? My gestational sac was measuring large and a crown rump length was measured.

Before I miscarried my ultrasound read: Gest Sac: 29 mm 8w 0d CRL: 4 mm 6w 1d +/- 0w 4d Could I have a COMPLETE molar pregnancy? Or is only partial an option?  My gestational sac was measuring large and a crown rump length was measured.

Hard to answer: Ultrasound features – Partial moles are often indistinguishable from complete moles on ultrasound. However, demonstration of fetal parts favors the diagnosis of a partial mole. Histological analysis of the aborted tissue is usually helpful in confirming the definite diagnosis. Your case demonstrates significantly enlarged sac which may happen with any molar pregnancy. ...Read more

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Everything was going well an last week i was told he is larger than his gestational age? Could we be further along ?

Everything was going well an last week i was told he is larger than his gestational age? Could we be further along ?

Possibly: More than likely you had an established due date at the beginning of the pregnancy. That is usually the most accurate dating. Once you are given a due date from the first trimester comparing your ultrasound and last menstrual period your due date should not change. So unlikely that you are further along. ...Read more

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Can the reading of a 10 week gestational age be wrong? Is it possible that the crown can be larger than other fetuses?

Can the reading of a 10 week gestational age be wrong? Is it possible that the crown can be larger than other fetuses?

Yes: Prenatal ultrasounds are not 100% accurate. Readings also depend on the training and experience of the tech and the ob. Ultrasonography cannot detect certain anomalies in the fetuses. There have been cases when fetuses have been aborted to find out, in the post-mortem, that they were perfectly normal. But, ultrasound remains a great diagnostic tool and many lives have been saved by it. ...Read more

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At what gestational age of fetus should the bpd measure approximately 4.1cm (41mm)?

At what gestational age of fetus should the bpd measure approximately 4.1cm (41mm)?

BPD: Well we use more than just bpd to calculate the gestational age. Head circ., femur length, and abdominal circ. Also go into the calculation. However, 4.1cm bpd is consistent with about 17 weeks 4 days. ...Read more

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Is the gestational age of a fetus measured by how big it is?If so, can't some fetuses be bigger than others which can cause due dates to be off?

Is the gestational age of a fetus measured by how big it is?If so, can't some fetuses be bigger than others which can cause due dates to be off?

Yes. : Ultrasound measurements of the fetus to determine gestational age are always reported as a range, which can be as much as 3 weeks late in pregnancy. ...Read more

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Do ultrasounds measure fetal or gestational age? And how accurate are they at 7 weeks 5 days?

Do ultrasounds measure fetal or gestational age? And how accurate are they at 7 weeks 5 days?

Yes. "Accurate".: Ultrasound pregnancy dating scans measure fetal size or age (time since conception), and convert the measurements to human gestational age. Gestational age is calculated by adding 2 weeks to the age of the fetus (to the time since conception), and roughly represents the total weeks since the first day of the last menstrual period (LMP). All dates are ESTIMATES, so 7w 5d means about 7w to 8w 3d. ...Read more

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Would there be a (big) difference in the measurement if a 12wk old fetus compared to a 9wk old fetus? The gestational age would be determined in u/s?

Yes: An first trimester sonogram is fairly accurate at dating a pregnancy (within a margin of error of about a week). At 12 weeks menstrual age with a viable pregnancy a sonogram measurement of 9 weeks would change the dating of the pregnancy and your due date should be based on that sonogram. Later sonograms should not change this established date. ...Read more

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I am 31 weeks neg for gestational diabetes an was told my son was large for his gestational age what would this mean , should I be worried?

I am 31 weeks neg for gestational diabetes an was told my son was large for his gestational age what would this mean , should I be worried?

Large baby: Your son being large for gestation may not mean that there is an abnormality. Have you gained a lot of weight during this pregnancy? There can be a familial history of delivering big babies. Consultation with a perinatologist can explore the issue and help ease your anxiety. Ask your ob-gyn or call a nearby medical center for one. ...Read more

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If last LMP is not known would a ultrasound measure sac in early pregnancy to match gestational age ?

If last LMP is not known would a ultrasound measure sac in early pregnancy to match gestational age ?

Yes: An early transvaginal ultrasound can accurately estimate the gestational age within a couple of days. In the first trimester, there is very little biologic variation in size. If the embryo is present, the "crown-rump length" is routinely measured and used to determine the gestational age. Also, the mean diameter of the gestational sac gives a reasonable estimate of age. ...Read more

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Should your fundal height measure to gestational age or fetal age? I.E. If 25 weeks from LMP should it be 25cm?

Should your fundal height measure to gestational age or fetal age? I.E. If 25 weeks from LMP should it be 25cm?

Not specific: Depends on the womon. There is a period of time during the pregnanacy when fundal height is predicatble for gestational age, but not necessarily at 25 weeks. ...Read more

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Do ultrasounds measure from gestational age or does it measure from the day of conception? I have an extremely irregular period..

Do ultrasounds measure from gestational age or does it measure from the day of conception? I have an extremely irregular period..

Ultrasound: measurements estimate the gestational age of the fetus. Gestational age is in relation to your last menstrual period. For example, a fetus measuring 8 weeks gestation on ultrasound would have been conceived 6 weeks prior to the ultrasound.A patient with 28 day cycles would have started her last menstrual period 8 weeks prior to the scan. Keep in mind that these measurements are estimates. ...Read more

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At 33 weeks pregnant, baby's femur measured slightly smaller than the gestational age and everything else was slightly larger. What could this mean?

At 33 weeks pregnant, baby's femur measured slightly smaller than the gestational age and everything else was slightly larger. What could this mean?

Normal variation?: Size, eg, length estimates by ultrasound can vary due to sonographer difficulty in obtaining measurement, inherent errors in the calculation, or genetic variation--just look at the parents of the baby! in rare cases variations from normal can be due to growth or other problem in the fetus. It is always appropriate to ask those ordering or performing a fetal ultrasound to interpret their findings. ...Read more

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If i conceived on november 25, but don't remember my last menstrual period, what would be my accurate gestational age and what would fetus measure?

If i conceived on november 25, but don't remember my last menstrual period,  what would be my accurate gestational age and what would fetus measure?

2 weeks earlier: If a woman knows she believes she conceived on november 25, then she can use november 11 (2 weeks earlier) as her lmp, for calculating pregnancy-related dates. Today is january 27, so the pregnancy is now 11 weeks. As always, all dates are just estimates. ...Read more