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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?

Half bigger/smaller: If you look at the size of babies at any point in pregnancy, the average defines a point where half are bigger & half are smaller. In some respects it is comforting as baby must be getting good nutrition through the placenta. It will bare watching because baby size at the time of delivery may prevent vaginal delivery. I have seen babies 11-15 lb at birth & that can be a problem. ...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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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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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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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)?

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