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Doctor insights on: At What Stage Is Chorionic Villus Sampling Done

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At what stage is chorionic villus sampling done?

At what stage is chorionic villus sampling done?

10-12 weeks: Chorionic villus sampling (cvs) obtains cells from the fetoplacenta for testing at 10-12 weeks of pregnancy, amniocentesis obtains fetal skin/urine cells at 16-18 weeks. Higher risks for miscarriage (2-3% for cvs, <0.5% or negligible for amnio) balance against the cvs advantage of testing before a women "shows, " preserving the privacy of pregnancy (testing). ...Read more

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How, when is chorionic villus sampling performed?

How, when is chorionic villus sampling performed?

First trimester: Cvs can be performed as early as 9 to 12 weeks of gestation - compared to amniocentesis that is usually done at 1bout 15 weeks. ...Read more

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What are amniocentesis, chorionic villus sampling and blood/saliva test screening used for? Abortions?

What are amniocentesis, chorionic villus sampling and blood/saliva test screening used for? Abortions?

Prenatal diagnosis: Cvs and amniocentesis are used to discover chromosomal abnormalities in the fetus. They are also used to diagnose genetic diseases, such as cystic fibrosis, that some people are at risk for. Blood and saliva screening tests are used to find out if parents are at risk for a baby with certain genetic diseases. ...Read more

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What types of doctors perform a chorionic villus sampling test? Fellows?

What types of doctors perform a chorionic villus sampling test? Fellows?

MFMs: Maternal fetal medicine specialists usually perform cvs, although there are occasional doctors of other specialties who have been trained to do the procedure. Fellows, who are still in training, may perform the procedure under the supervision of the doctor who is teaching them. ...Read more

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Chorionic villus sampling (cvs) can test for what all diseases?

Chorionic villus sampling (cvs) can test for what all diseases?

Chromasomal or: Genetic disorders. Can detect missing or extra chromasomes, i.e. 47 instead of 46 present in down syndrome. Can test for genetic, inherited disorders like cystic fibrosis or tay-sachs disease. ...Read more

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What is the definition or description of: ultrasound-guided chorionic villus sampling?

What is the definition or description of: ultrasound-guided chorionic villus sampling?

Looks at chomosomes: Chorionic villus sampling enables a doctor to remove a small sample of the tissue that surrounds the early sac of pregnancy. This, then, allows the study of the chomosomes - for early diagnosis of conditions such as down syndrome (an extra chromosome #21). It is done with ultrasound guidance at roughly 11 weeks of pregnancy. Amniocentesis is a procedure done later in pregnancy for the same reason. ...Read more

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What instruments are used to perform a chorionic villi sampling?

What instruments are used to perform a chorionic villi sampling?

Ultrasound: Ultrasound is used to assess the anatomy of the fetus and placenta. This allows directed placement of the biopsy needle to get a speciman. This is usually done under local anesthesia. ...Read more

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How accurate is a ultrasound done at 14 weeks gestation?

How accurate is a ultrasound done at 14 weeks gestation?

Plus/ minus 2 weeks: A single ultrasound for dating is only good to estimate gestational age within 10 days to 2 weeks. Serial ultrasounds tend to be much more accurate. ...Read more

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Which specific doctors perform a chorionic villus sampling test?

Which specific doctors perform a chorionic villus sampling test?

MFMs: Your obstetrician would refer you to a maternal-fetal medicine specialist (perinatologist) or you may have one already if a prior pregnancy or other circumstances caused your current pregnancy to be high risk. ...Read more

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Is an ultrasound done at 7months of pregnancy accurate?

Is an ultrasound done at 7months of pregnancy accurate?

FOR WHAT?: An ultrasound at 7 months is very poor for determination of gestational age. The exam will measure fetal size and estimate fetal weight. Fetal size at 7 months can be off by as much as 3 weeks for gestational age due to individual variability. Moral of the story is to get an early sono before 12 weeks for gestational age determinations. ...Read more

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How would chorionic villi sampling determine whether a fetus has genetic abnormalities?

How would chorionic villi sampling determine whether a fetus has genetic abnormalities?

Laboratory testing: Cvs sampling after 10 weeks of gestation can obtain tissue for testing. The tests usually done are chromosomal analysis or mutational analysis of a specific gene. ...Read more

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Why would a pregnant person need chorionic villus sampling (cvs)?

Why would a pregnant person   need chorionic villus sampling (cvs)?

Genetic testing: Chorionic villous sampling represents one of the earliest available methods to accurately diagnose genetic abnormalities such as down's syndrome. While most, if not all, of these defects are not curable, it does give the patient the earliest opportunity to decide on whether to continue the pregnancy. ...Read more

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How accurate is the transabdomen and transvaginal ultrasound for early detection of ovarian cancer?

How accurate is the transabdomen and transvaginal ultrasound for early detection of ovarian cancer?

Not very: Unfortunately, there is no good screening for ovarian cancer. Ultrasound will show a mass if there is one and may help characterize it as likely benign or malignant. This, with blood test and recognizing symptoms, might help with managment of a mass that is already there, but not in early detection. Notify your doctor if you have persistent bloating, change in bowel or bladder habits, or pain. ...Read more

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How accurate is ultrasound done at 20 weeks for gender determination of fetus. Is obstretics ultrasound with same accuracy. Same question for 22 wks?

How accurate is ultrasound done at 20 weeks for gender determination of fetus. Is obstretics ultrasound with same accuracy. Same question for 22 wks?

Depends.: My rule has always been: don't guess! if the fetus is in a poor position for viewing the genitals then no determination can be made. At 20 weeks, if the genital region is visible there is a very high level of accuracy for gender determination. It all depends on the skill of the person doing the scan. ...Read more

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Safety of chorionic sampling vs. Amniocentesis for prenatal diagnosis of chromosomal abnormalities?

Safety of chorionic sampling vs. Amniocentesis for prenatal diagnosis of chromosomal abnormalities?

Risks: The risk of pregnancy loss has been looked at in four randomized studies of cvs vs. Amniocentesis. All four studies show that both procedures have about the same risk of pregnancy loss. About 1 in 1600. Another cvs study showed that losses in a group of women who had the procedure were equal to losses in a group of women who didn't have the procedure. A loss may not be related to the procedure. ...Read more

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How inaccurate is a pregnancy ultrasound done at 14 weeks?

How inaccurate is a pregnancy ultrasound done at 14 weeks?

Pretty accurate. : Depends on the sonographer and whether it was vaginal or abdominal u/s but at that point in pregnancy for dates it will be pretty accurate usually. ...Read more

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