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Doctor insights on: Ultrasound Measurements

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Pregnancy ultrasound dating accuracy?

Pregnancy ultrasound dating accuracy?

Earlier the better: In the first trimester (< 14 wks) it's accurate within days. The later in pregnancy, the more inaccurate it is to date a pregnancy. Roughly, if an ultrasound differs by a week in the first trimester, dates are changed. 2 weeks for second trimester & 3 wks difference in the third trimester to change the due date compared to an lmp due date. Always keep the earliest us edc, it should never change. ...Read more

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Dr. Michael Gabor
2,272 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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Are transvaginal ultrasounds more accurate in dating than abdominal ultrasounds?

Are transvaginal ultrasounds more accurate in dating than abdominal ultrasounds?

Depends: On the size if the baby. Transabominally is fine as the baby increases in size. If it is really small then tv is bettet. ...Read more

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Are transvaginal ultrasounds accurate concerning due date ?

Are transvaginal ultrasounds accurate concerning due date ?

Yes: Transvaginal ultrasound is usually done in the first trimester (12 weeks). Generally, early ultrasounds are more accurate for dating. than late ultrasounds. ...Read more

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How accurate are dating ultrasounds?

Depends: 1st trimester +\- 5 days 2nd tm +- 10 days 3rd tm +- 21 days. ...Read more

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Can transvaginal ultrasound detect 4 weeks gestation?

Can transvaginal ultrasound detect 4 weeks gestation?

Perhaps: Kyl: at that early stage we may see a decidual (pregnancy) reaction in the uterus and a small gestational sac. We would not be able to see the actual fetal pole or heartbeat that early. A scan at 7-8 weeks would be best to document a good, viable pregnancy with a heartbeat. ...Read more

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Is an ultrasound at 13 weeks measuring crl accurate?

Is an ultrasound at 13 weeks measuring crl accurate?

Maybe: This is in the area of overlap where crl loses accuracy and measuring fetal parts like head diameter is also not as accurate, which is why we like to do sono before 12 or after 14. ...Read more

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Is testicular ultrasound a transrectal ultrasound!?

Is testicular ultrasound a transrectal ultrasound!?

No: Testicular us looks for abnormalities of the testicle. Transrectal us is used to evaluate either the anal sphincter mechanism or stage rectal rumors. ...Read more

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How actuate are the ultrasound measurements?

How actuate are the ultrasound measurements?

Depends on what it i: The accuracy & precision of an ultrasound machine depends on many factors, including the freq of the ultrasound transducer (higher frequency = better resolution), but also the structure imaged: the deeper the object, the lower the frequency used, to get penetration. Also, the tech/user technique comes into play: did they get the angle right? How hard do they press? Doppler flow is similarly variab ...Read more

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Is transvaginal ultrasound accurate in detecting early pregnancy?

Is transvaginal ultrasound accurate in detecting early pregnancy?

Yes: At 5-6 weeks a gestational sac and pregnancy reaction can be seen. At about 7 weeks a tiny fetal pole and heartbeat can be seen. At less than 5 weeks, nothing may be seen so would need to check blood and urine results before planning for sono. ...Read more

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Are testicular ultrasounds accurate?

Are testicular ultrasounds accurate?

Generally, yes.: Scrotal ultrasounds (us) are very sensitive for determining the presence of testicular masses, cysts, and relatively sensitive for detecting infection. Doppler studies done by us are very good at determining blood flow and evaluating torsion. Though us can make a diagnosis of tumor, it usually cannot reliably predict the type of cancer. The experience of the technician also makes a difference. ...Read more

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Can trans-vaginal ultrasounds pick your LMP date?

No: If you are pregnant and you don't know when was you lmp and ultrasound can help determine gestational age but it does not tell you when was you lmp. ...Read more

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How are conception dates determined from transvaginal ultrasound?

How are conception dates determined from transvaginal ultrasound?

Due dates: Transvaginal ultrasounds early in pregnancy measure the crown to rump length of the fetus. It is a very accurate measure of the progress of the pregnancy and importantly, when will you be 40weeks. ...Read more

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Do ultrasound techs take measurements of all organs during an abd ultrasound?

Do ultrasound techs take measurements of all organs during an abd ultrasound?

Yes: Ultrasound can give three dimensional measurements of most organs height, depth, and width. Most common organs measured are kidneys, spleen, liver, ovaries, uterus, bladder, and two dimensional measurements of appendix aorta, and inferior vena cava. Of course if tumor or lymph nodes present these can be measured. ...Read more

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Are 30+ week ultrasound measurements accurate to date a pregnancy?

Are 30+ week ultrasound measurements accurate to date a pregnancy?

Not exactly: while an ultrasound in the third trimester can give you an idea based on size of the fetus, they are only accurate +/- 3 weeks. If the fetus is having growth restriction or is large for age, they will be off. If there is a fluid problem, they will be off. The best time in a pregnancy to obtain dating via ultrasound is the first trimester. Good luck! ...Read more

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What's the difference between transvaginal & transabdominal ultrasound?

What's the difference between transvaginal & transabdominal ultrasound?

Access point.: Both transabdominal and transvaginal sonogram are useful and may even be complementary in imaging the pregnant uterus or non-pregnant pelvis. Different probes are used for each type and the transvaginal approach is clearly less comfortable, however it has the advantage of improved imaging in obese women, in early pregnancy and in fetal brain lesions in late pregnancy. ...Read more

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Ultrasound showing a mass but CT scan normal?

Ultrasound showing a mass but CT scan normal?

Depends: This depends on the organ of interest. This is not uncommon with the ovaries and uterus as us has an advantage. This is same with the breasts as well. As for other organs in the abdomen, sometimes it may depends on the patient's body habitus or lack of intravenous contrast/dye that some finding may not be apparent on ct. ...Read more