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Doctor insights on: Fetus Significant Difference

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Is there a significant size difference in a 14 wk fetus compared to an18 wk fetus?

Is there a significant size difference in a 14 wk fetus compared to an18 wk fetus?

Yes: Yes, there is a significant size difference in a baby fetus who is 18 weeks, compared to when he or she was only 14 weeks. ...Read more

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There is a significant difference between a 20 weeks fetus and a 30 weeks one at the u/s? What about 13 weeks and 20 wks?

There is a significant difference between a 20 weeks fetus and a 30 weeks one at the u/s? What about 13 weeks and 20 wks?

Yes, there sure is: There is an unmistakable difference between a 20-week fetus and a 30-week fetus on ultrasound scanning, just like there is an unmistakable difference between a 13-week fetus and a 20-week fetus. ...Read more

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Isn't a 12 wk u/s accurate within 5-7 days? Don't the fetus measurements vary slightly and would show a difference of 11 days?

Isn't a 12 wk u/s accurate within 5-7 days?  Don't  the fetus measurements vary slightly and would show a difference of 11 days?

5 days either way: The error is plus or minus 5 days. So at 12 weeks the range is one of 11 days. Earlier ultrasounds are more accurate. If the ultrasound was done between 6 and 10 weeks, the error would be plus or minus 3 days for a range of 7 days. ...Read more

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Is there a big difference between 11 week and 13 week fetus?

Is there a big difference between 11 week and 13 week fetus?

Yes and No: The development of the embryo (it's an embryo until the 2nd trimester, when it becomes a fetus), is on a continuum. While there are differences in organ development between 11-13w, more important difference is between 37-39 weeks. It's important to establish due date in first trimester. Management decisions at 11-13w aren't as crucial as they become at 37-40 weeks. 11-13w woman do NT screen ...Read more

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What's the size difference between 14 week and 18 week fetus?

About double: At 14 weeks a fetus is about 3.5" from head to butt, and around 5.5" at 18 weeks, almost twice as long. We don't measure head to toe since they are rarely stretched out like that for more than a moment. ...Read more

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Is there a difference between a 13 week old fetus and a 17 week old fetus?

Yes: there is considerable development and increase in size in the 4 weeks. ...Read more

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What's the difference in size between an 8 week fetus and a 12 week fetus? Is there a big difference?

What's the difference in size between an 8 week fetus and a 12 week fetus? Is there a big difference?

Yes there: Is a substantial difference in size and the formation of extremities during the tenth week, closure of the neural tibe (spine) and facial formation among other important milestones in development. ...Read more

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Need advice on what is the the difference between the gestational age of a fetus and how many weeks you are?

Need advice on what is the the difference between the gestational age of a fetus and how many weeks you are?

Same thing: The way you count is from your last period, it is 40 weeks from your last period until your due date so when you are 6 weeks gestational age it means 6 weeks from your last period which is how many weeks u are ( most people get pregnant 2 weeks after their last period ) but u always count from the 1st day of the last period, and in my office in coral springs, fl, i always do an early ultraosund. ...Read more

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Are the measurements that precise on ultrasounds that it can show the difference between a 12wk fetus and a fetus that is 12wks and 4 days?

Are the measurements that precise on ultrasounds that it can show the difference between a 12wk fetus and a  fetus that is  12wks and  4  days?

No.: At 12 weeks, the estimated accuracy of ultrasound measurements (crown-rump length or crl) is +/- 7 days. Take Folic Acid 1-5 mg daily and best of luck! ...Read more

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Do all fetuses in 1st trimester measure the same or can there be wide variation? A12 wk fetus couldn't measure 8-9 wks;too wide a difference in mm?

Do all fetuses in 1st trimester  measure the same or can there be wide variation? A12 wk fetus couldn't  measure 8-9 wks;too wide a difference in mm?

Early sono: Early sonograms are very accurate. The margin of error at 12 weeks would be about 5 days. A 12 week fetus would not measure 8 weeks. ...Read more

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What is the size difference of a 9 week old fetus compared to a 12 week old fetus?

What is the  size difference of a 9 week old fetus compared to a 12 week old fetus?

23mm vs 57mm: The crown rump length of a 9 week fetus is 23mm (0.9 in). A 12 week fetus has a crl of 57mm (2.24 in). This does not include the length of the legs which cannot be reliably measured. ...Read more

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Might it be that a a sonogram tell the difference between a 9 week and a 12 week fetus?

Yes: At that early stage the stated fetal age is accurate to within plus or minus five days with a 95% confidence level. ...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?

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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Fetus measurements: 57mm 12 weeks gestation / 62mm 12 wks+4days gestation. Are measurements this precise to have this difference in size in 4 days?

Fetus measurements: 57mm 12 weeks gestation / 62mm 12 wks+4days  gestation. Are measurements this precise to have this difference in size in 4 days?

Sort of: Yes, the measurements on average do correspond to these dates and they are fairly accurate, but not exact. Also it is dependent on how the ultrasound tech measures it. So there are plenty of sources of mild error. ...Read more

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Would i feel any physical difference or feel ill if my immune system started to create antibodies against my fetus? 4 months pregnant and a rhesus neg

HIghly unlikely: Being anxious about the fetus is common, but you are really talking about something extremely rare especially when you do not have an autoimmune disease. Remember that maternal anxiety during pregnancy can adversely impact the health of the infant and thus you should just enjoy the experience. If the father is rh positive, you may potentially become rh positive from the pregnancy. ...Read more

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What's the difference between fetal and adult circulation?

What's the difference between fetal and adult circulation?

Many differences.: The fetal circulation is a wonderful demonstration of the evolutionary wisdom of mother nature. It contains three vital shunts (ductus venosus, foramen ovale, ductus arteriosus) that serve to bypass the lungs (have no contribution to gas exchange in utero) and deliver the most oxygen/nutrient-rich blood to the coronary and carotid arteries. Finally, both hypogastric arteries connect to placenta! ...Read more

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What's the difference between fetal age and gestational age?

What's the difference between fetal age and gestational age?

Minor: Gestational age refers to the length of time since the first day of your last period. Fetal age refers to the age of your developing baby, counting from the estimated date of conception. ...Read more

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Difference between echocardiography and fetal echo?

Difference between echocardiography and fetal echo?

Adult and fetal: A fetal "echo" means a fetal echocardiogram. This is a detailed ultrasound of the fetus' heart, and it is done through the mother's abdomen. An adult can have an echocardiogram as well. It is either done through the chest wall, or with a special transducer that goes down the adult's esophagus ("transesophageal") to get closer pictures of the person's heart. ...Read more

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What is the difference between a fetal targeted ultrasound and an echocardiography?

MFM vs. Ped/cards.: Maternal-fetal medicine specialists can perform and interpret targeted fetal cardiac examinations and fetal echos with up to 75% detection rate. Pediatric cardiologists can perform fetal echos with up to 95% detection rate. ...Read more

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Difference between fetal spina bifida and anencephaly?

Difference between fetal spina bifida and anencephaly?

Very different: Anencephaly is the abscence of a closed cranial cavity (head) and implies incomplete brain development/function. Essentially, anencephaly is being born without functioning brain.
Spinal bifida is an incomplete closure of the neural tube. There is no implication of brain development or brain function.
While there may be paralysis in spina bifida, the brain can function normally in many cases. ...Read more

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Is there a big difference in fetal development and maturation if a baby was born at 31 weeks compared to 35.5 weeks?

Is there a big difference in fetal development and maturation if a baby was born at 31 weeks compared to 35.5 weeks?

yes: You are talking about a difference of about ten percent and the difference between the two gestational ages is significant. Most 35 weekers will do ok from a lung perspective but many 31 weekers will have resp. Issues. Both are preemie but one is much closer to term. ...Read more

Dr. James Lin Dr. Lin
1 doctor agreed:
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How do it tell the difference between a gaseous intestines or fetal movement ?

Dr. James Lin Dr. Lin
1 doctor agreed:
How do it tell the difference between a gaseous intestines or fetal movement ?

Here are some...: Are you in your first pregnancy? Experience helps to tell difference. Gaseous intestines come with tympanic abdomen on percussion, more gas passage especially following intestinal gurgling , etc. after taking certain foods; fetal movement is quiet... More? Ask your gyn-doc timely. ...Read more

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Is there any difference between osmotic fragility of fetal red blood cells and adult red blood cells?

Is there any difference between osmotic fragility of  fetal red blood cells and adult red blood cells?

Yes.: Fetal red cells are larger, and with extra surface area to volume and therefore a bit more resistant to osmotic injury than adult red cells. ...Read more

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Can you tell me about fetal skull anatomy - what's the difference between adult skull and pediatrics skull anatomy?

Can you tell me about fetal skull anatomy - what's the difference between adult skull and pediatrics skull anatomy?

Adult / child Skull: Size is the main difference and after 2 years of age and once the fontanelles and sutures are closed, there is not much of difference in the skull itself.
that is how the adult projection from child pictures is possible ...Read more

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