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Doctor insights on: Fetal Abnormalities On Ultrasound

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When you subtract 2 weeks from the ga provided by an ultrasound, does that give you the estimated fertilisation age or the estimated fetal age?

When you subtract 2 weeks from the ga provided by an ultrasound, does that give you the estimated fertilisation age or the estimated fetal age?

Yes: When estimating gestational age by using an ultrasound scan, 2 weeks are added to the fetal age (the fetal age is the fertilisation age). ...Read more

Dr. Michael Gabor
2,275 doctors shared insights

Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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My ultrasound report says no gross abnormalities found in fetus. What does that mean?

My ultrasound report says no gross abnormalities found in fetus. What does that mean?

Unremarkable scan.: This is typical verbage for an unremarkable prenatal ultrasound. That means that the examination did not identify major fetal anomalies such as gastroschisis, omphalocele, anencephaly, spina bifida, diaphragmatic hernia, major heart/kidney/lung/skeletal defects. Congratulations - however keep in mind that even in experienced centers the detection rate of anomalies may not surpass 60-80%. ...Read more

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Can i have the 3d ultrasound to detect fetus abnormalities during third trimester?

Can i have the 3d ultrasound to detect fetus abnormalities during third trimester?

Ask you MD: You need to ask your MD that question because they are best able to interpret any findings as well with the exam. ...Read more

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What is more accurate for fetus age-lmp or ultrasound? Had u/s at what i thought was 13w but u/s said 11w3days. Do i book another at my 20w or theirs

What is more accurate for fetus age-lmp or ultrasound? Had u/s at what i thought was 13w but u/s said 11w3days. Do i book another at my 20w or theirs

8-13 week US better: Base your followup us on the current us results. Ob us is most accurate between 8 and 13 weeks, measuring crown rump length of the fetus, and when there is a difference between LMP and this us, the us is usually correct, if performed well.

The fetal anatomy screening us should be between 18 and 22 weeks, so hedge your bets and schedule between 19 and 20 weeks based on the first us. ...Read more

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Does ultrasounds give fetal age or gestionation age?

Does ultrasounds give fetal age or gestionation age?

Gestational age: Ultrasounds factor in the manner in which we 'date' pregnancies and they are basing analysis of your baby's growth against all babies of the same age. Hope that helps! ...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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I am 5 months preggy and just had my ultrasound. It showed a male fetus. Can it be possibly a female?

I am 5 months preggy and just had my ultrasound. It showed a male fetus. Can it be possibly a female?

Depends : If there was clear evidence of male genitalia then it's a male. Sometimes it looks like one type of genders anatomy but the sonographer is not sure. So in these cases they might be wrong. ...Read more

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Can a fetus that shows at the ultrasound 8 weeks can actually be 14 weeks and the ultrasound to show more?

Can a fetus that shows at the ultrasound 8 weeks can actually be 14 weeks and the ultrasound to show more?

Don't completely: understand the question, but a normal 14 week fetus could never be mistaken for an 8 week gestation. ...Read more

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Does zooming in on an ultrasound affect the due date given ? And can a 7 week fetus be mistaken door a 9 week fetus ?

No: Zooming in does not affect measurements, the machine accounts for the zooming in. Ultrasound dates based on measurement. It is the most accurate way to date a pregnancy if done in first trimester. ...Read more

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Is an efw via ultrasound of 3lb 9-10oz large for a 30w3d fetus? How accurate is this weight? Edd was confirmed by multiple early ultrasounds.

On track: That weight is on track for that age. For the 3rd trimester, your baby is fully formed and now just gaining weight and developing lung strength, etc. Baby will gain about 1/4 to 1/2 pound a week from here on. ...Read more

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GA is 8 weeks 4days when ultrasound was done. Ultrasound shows GA as 7 weeks 6 days. Fetus is 1.47cm. FHR 158bpm. Is this normal range? I'm 40.

GA is
 8 weeks 4days when ultrasound was done. Ultrasound shows GA as 7 weeks 6 days.  Fetus is 1.47cm. FHR 158bpm. Is this normal range? I'm 40.

Within normal range: At this point in pregnancy, a 4 to 5 day difference between the dating of your pregnancy by your last normal menstrual period and the dating by sonographic findings is usually within acceptable limits and subject to confirmation by another ultrasound 4 to 5 wks later. The 1.47 cm measurement of embryo can be considered" fairly reliable and accurate" if obtained by a skilled, certified sonographer ...Read more

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9 week ultrasound showed 2 sacs with fetus A 2.7 CRL with HB and fetus B 1.5 CRL with no HB at 7 weeks 2 days, what r chances of VTS and chimera?

VTS: At this early gestation, the embryo without a heartbeat will gradually go away. Since there are 2 sacs, there is little risk to the healthy fetus. ...Read more

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What is 3d fetal ultrasound?

What is 3d fetal ultrasound?

New computer softwar: New computer software allows for the individual planes acquired during regular prenatal ultrasound scanning to be collated, manipulated and illustrated in a three-dimensional fashion for the uninitiated couples to be able to effortlessly visualize their unborn baby. It provides few/no significant advantage over traditional 2d prenatal ultrasound for the experienced physician/sonographer. ...Read more

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How a fetus age is known by ultrasound?

How a fetus age is known by ultrasound?

By measurements: the crow-rump (head-bottom) lengths of the fetus and looking up from the chart, one can easily estimate the gestational age from fetal ultrasound imaging study. ...Read more

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Can you see fetus in ultrasound after 4 weeks?

Can you see fetus in ultrasound after 4 weeks?

Likely not: The gestational sac is detectable by about 5 weeks. The fetal pole is typically detectable by 5.5 to 6.5 weeks with transvaginal us but may be seen as soon as 5 wks. It is a bit later with transabdominal us, after 6 weeks. ...Read more

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In what age we can distinguish sex of the fetus in ultrasound?

In what age we can distinguish sex of the fetus in ultrasound?

13 Weeks: Although occasionally the sex of the fetus can be discerned by week 11, ultrasounds done after the 13th week are 95-100% accurate in identifying the sex of the fetus... That is, assuming there is no malformation of the genitals. Good luck! ...Read more

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Can 13 week fetus be mistaken in ultrasound as a 9 week fetus?

NO not in my office: Either your dates are off or there is something wrong with the pregnancy, at 13 weeks the margin of error is 5-6 days at the most either way. ...Read more

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Can you tell me how precise are ultrasounds about fetal weight?

Can you tell me how precise are ultrasounds about fetal weight?

See below. : They are pretty accurate. Any variations will be due to operator dependence, how accurately measurements were taken and position of the fetus. Measurement/weight charts were developed over many years, by several different studies, all showing some degree of difference. Although not 100% dead on, ultrasound determination of weight should be considered as the most accurate guesstimate. ...Read more

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At how many weeks do you see the development of a fetus on a ultrasound?

6-7 weeks: You can first see a fetus around 6 weeks with most ultrasound machines. ...Read more

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Can ultrasounds (2d, 3d and 4d) have an affect on a developing fetus? Long term affects?

Can ultrasounds (2d, 3d and 4d) have an affect on a developing fetus? Long term affects?

Highly unlikely: There have never been problems from ultrasound, either long or short term, demonstrated conclusively in humans. While it's impossible to guarantee zero chance, there have been many millions of ultrasounds on pregnant women with no convincing suggestion of risks. Recommendations are still to limit us exposure to medically necessary - so the boutique 'keepsake' ultrasounds should be avoided! ...Read more

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Ultrasound showed fetus 9w 1day , but he is 9w 4days, can they be wrong when measuring?

Margin of error: This is normal. All sonograms have a mathematical margin of error. A 9 week sonogram was about a 5 day margin of error. That is just as good as it can get. Your sonogram showing a 3 day difference indicates that it is measuring right on track. ...Read more

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Can a 9 week fetus possibly grow slow and measure at time of ultrasound at 7 weeks? And be normal?

Can a 9 week fetus possibly grow slow and measure at time of ultrasound at 7 weeks? And be normal?

Yes: Yes, usually dating can be a bit off. Important to continue following to demonstrate continued growth along the normal curve with continued normal cardiac activity. Good luck! ...Read more

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The dr. Told me i was 5 weeks during a ultrasound. All we saw was a sack and a little tiny fetus.(i mean very small fetus) can you see a sack at 5 wks?

The dr. Told me i was 5 weeks during a ultrasound. All we saw was a sack and a little tiny fetus.(i mean very small fetus) can you see a sack at 5 wks?

Yes: At 5 weeks a gestational sac and a very tiny fetus is all we would usually expect to see. So it sounds like you are right on track! i'm sure your doctor has you scheduled for a follow-up sono to make sure the fetus continues to grow and to document a normal fetal heart rate. ...Read more

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Doppler ultrasound safe for fetus?

Doppler ultrasound safe for fetus?

Doppler ultrasound: A doppler ultrasound is used to measure flow. It uses sound waves and doesn't hurt the fetus at all. ...Read more

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When are you able to see a fetal heartbeat on an ultrasound?

Varies: On transvaginal ultrasound fetal heart activity can be seen as early as 5.5 weeks but more typically after 6 weeks and always after 7 weeks in live pregnancies. In very early fetuses, on trans-abdominal sono early fetal heart visualization is complicated by uterus position, large patient size, and bladder filling. ...Read more