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Doctor insights on: 18 Week Ultrasound Scan In Pregnancy

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Do transvaginal ultrasound 100% sure in detecting a one week pregnancy?

Do transvaginal ultrasound 100% sure in detecting a one week pregnancy?

No: The sensitivity of a transvaginal us is operator dependent and usually don't see anything until the hcg level is 5000 or so which usually corresponds to 4-5 weeks pregnant ...Read more

Dr. Michael Gabor
2,286 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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If urine pregnancy tests were giving false negatives and a pelvic CT scan was performed at a possible 7 weeks pregnant, would the fetus show in scan?

If urine pregnancy tests were giving false negatives and a pelvic CT scan was performed at a possible 7 weeks pregnant, would the fetus show in scan?

Precautions: The radiology place I am sure would have taken the precaution of finding if you were pregnant before doing the scan and should have used a reliable test. And yes, if you were pregnant, as long as the area of interest shows the pregnancy they should be able to see it and give you advise…but then again, it should not happen. ...Read more

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Had a neg hcg. week later showed positive, 8 positive pregnancy tests according to LMP should be 6 week transvaginal ultrasound didn't show gest sac?

Had a neg hcg. week later showed positive, 8 positive pregnancy tests according to LMP should be 6 week  transvaginal ultrasound didn't show gest sac?

Not unusual: That is not that unusual. Often the sac won't be visualized until 8 weeks. As long as your BHCG levels are rising and they do not see any evidence of a tubal pregnancy, try to relax and be patient. Most OB's won't even have you come in untold 10 weeks because that is about the time the heart beat will be noticeable. ...Read more

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Spotting in the 1st trimester after hCG +ve and ultasound confirmed pregnancy, ?

Spotting in the 1st trimester after hCG +ve and ultasound confirmed pregnancy, ?

Threatened Sab: You have a threatened miscarriage. Anyone in early pregnancy with spotting is said they have a threatened miscarriage. It is very common, although not normal. As long as you are not bleeding heavily (soaking a pad in an hour) I would just follow up with your obstetrician. ...Read more

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Standard screening and dating pregnancy ultrasound showed nothing. Do I need 20 week one?

Standard screening and dating pregnancy ultrasound showed nothing. Do I need 20 week one?

Recommended: Most obs perform a high-resolution us between 18-20 weeks to rule out anomalies. It's a good time to screen the fetus, document placental location, and even check gender. We no longer "wait & see" when it comes to labor since there's an advantage to having the right equipment & personnel at delivery if an abnormality is present. ...Read more

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Any chance "not see" your baby in week 18 on trans-vaginal scan?

Any chance "not see" your baby in week 18 on trans-vaginal scan?

No: At 18 weeks pregnant the uterus is almost to the belly button. The ultrasound is done abdominally to get a good look at the baby, and often a transvaginal scan is done also to get a close look at the cervix. So if a woman is 18 weeks, the baby will be seen both ways, though better abdominally. ...Read more

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What is a ultrasound seen in 4 week 3 days of pregnancy?

What is a ultrasound seen in 4 week 3 days of pregnancy?

Chorionic cavity: At 4 weeks 3 days gestation, via transvaginal us, a small fluid filled cavity, the chorionic cavity, can be seen. It's average diameter is 2-3 mm (tiny! look at a ruler). Surrounding it is an echogenic layer about 2 mm thick representing decidual reaction of the uterine lining and the trophoblasts of the developing embryo. The yolk sac is usually identified at 5.5 weeks and embryo at 6 weeks. ...Read more

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2 positive home pregnant tests. Had transvaginal ultrasound 16 days post ovulation. No sac seen. Is this normal for 16 days after conception?

2 positive home pregnant tests. Had transvaginal ultrasound 16 days post ovulation. No sac seen. Is this normal for 16 days after conception?

Too early: It is unusual to see a pregnancy on ultrasound until about 5 weeks, which when you are a week late. If you ovulated late, it could show up any later. If your or your doctor is concerned about an ectopic pregnancy it should be repeated. ...Read more

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How accurate are ultrasound scans in pregnancy?

How accurate are ultrasound scans in pregnancy?

Depends: The precision of an ultrasound depends somewhat on the equipment, the technician, the interpreter & the reason for study. If the scan is done to verify the placental location, fetal position & head size(to verify dates), simple equipment works ok. Specific things about baby like heart anatomy, facial features and the like, require a skilled technician using special equipment & interpretation. ...Read more

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Do early ultrasound dating scans assume conception on cycle day 14?

Do early ultrasound dating scans assume  conception on cycle day 14?

Yes and no: We don't date pregnancies from date of conception but in a sense we do make that assumption. ...Read more

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Is my 6 week pregnancy scan more accurate or my 12 week scan to when I conseived?

Is my 6 week pregnancy scan more accurate or my 12 week scan to when I conseived?

The earlier the bett: Although, earlier scans appear to be more accurate, the difference between 6 and 12 weeks should not be striking. ...Read more

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Just had my 20 week scan, nuchal fold measured at 6.4 mm, and the doctor saw a choroid plexus cyst. Should we be worried. First trimester negative.

Just had my 20 week scan, nuchal fold measured at 6.4 mm, and the doctor saw a choroid plexus cyst.  Should we be worried.  First trimester negative.

Choroid plexus cyst: The finding of a choroid plexus cyst in ultrasound scans in pregnancy is very common and most resolve over time. A repeat ultrasound in a month or two may show that the cyst has "disappeared". If you have more questions, consult a maternal-fetal medicine specialist, but your concern should be minimal. ...Read more

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I had my anatomy scan at 20 weeks of pregnancy. Cerebellum only measured 18 wks. Doc said she didn't have time to go over scan that day. I'm worried! ?

I had my anatomy scan at 20 weeks of pregnancy. Cerebellum only measured 18 wks. Doc said she didn't have time to go over scan that day. I'm worried! ?

Consider level II: It may be that your dates are not correct. Or there may be an issue needing follow up. Try to find out if you are in need of a "level II" or detailed ultrasound from a maternal fetal specialist, or high risk pregnancy doctor. This is not saying your pregnancy is high risk, just that the ultrasound may warrant a second look. ...Read more

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31 weeks ultrasound, fetus showed a clearly distended bladder, no dilation in kidneys n amniotic pool was good. Ultrasound repeated next day showed same?

31 weeks ultrasound, fetus showed a clearly distended bladder, no dilation in kidneys n amniotic pool was good. Ultrasound repeated next day showed same?

Not necessarily : At this time during fetal development, the urine output is very large. This large volume may give the appearance of a distended bladder. It is reassuring that the kidneys are not dilated and that the amniotic fluid is normal. It would be desirable to know the gender of the baby prior to recommending additional imaging which would have to start with an ultrasound study shortly after birth. ...Read more

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If a transvaginal ultrasound showed 8wks pregnant when was date of conception?

If a transvaginal ultrasound showed 8wks pregnant when was date of conception?

6 weeks earlier: If you provide the date of the ultrasound and the exact gestational age in weeks and days and/or the due date you were given based on the ultrasound, we can give you an estimate of the conception date. It's 6 weeks earlier than the given gestational age at time of ultrasound. ...Read more

Dr. Scott Keith
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more