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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
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 moreSee 1 more doctor answer
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
Are ultrasounds done at 13 weeks pregnant accurate? What is the margin error of dating scans performed at this stage of the pregnancy?
Yes, fairly accurate: The margin of error on a dating scan at 13 weeks is approximately 7 days. ...Read more
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
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
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
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
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 moreSee 1 more doctor answer
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 moreSee 1 more doctor answer
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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