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2,065 Posts
Discussion Starter · #1 ·
Hello ladies!!<br><br>
My mom is in Nursing school (at 52! Yay mom! <img alt="" class="inlineimg" src="" style="border:0px solid;" title="love"> )-- mainly interestd in L&D, which is the unit they're doing right now. Of course, she is learning all the very mainstream hospital ways of doing things, but don't get me started on that. Expect to see me popping up here occasionally to pick your wise brains on her behalf <img alt="" class="inlineimg" src="" style="border:0px solid;" title="innocent"><br><br>
I know many prenatal tests are invasive, possibly damaging to the baby, and unnecessary, but she is learning about them all and has a question - <b>if chorionic villi sampling can be done earlier than amnio, why isn't it used more?</b> If anyone has any info, thoughts, etc, we'd really appreciate it!!!<br><br>
P.S. She was horrified when I pointed out to her how quickly they cut the cord in hospitals, so I'm making some progress with her... maybe by the time I ttc she'll be pro-homebirth <img alt="" class="inlineimg" src="" style="border:0px solid;" title="upsidedown">

3,265 Posts
The short answer is that it carries greater risk.<br><br><div style="margin:20px;margin-top:5px;">
<div class="smallfont" style="margin-bottom:2px;">Quote:</div>
<table border="0" cellpadding="6" cellspacing="0" width="99%"><tr><td class="alt2" style="border:1px inset;">As with amniocentesis, there is concern that having the test may cause a woman to miscarry. The likelihood of miscarriage due to CVS is not known with certainty. About 4% of women who have had CVS have had a miscarriage following the test. We do not know which of the miscarriages are actually due to the test, although it is believed that many of them are not due to the test but occur spontaneously. <b>Several studies suggest that CVS has about a 0.5-1.0% greater risk than amniocentesis for causing a miscarriage.</b> For some patients having the test done during the first three months of pregnancy, and knowing the results quickly is considered to such an advantage, that they are willing to assume a slightly higher risk rather than wait for amniocentesis. There is also a small but important risk of infection in the uterus following CVS. Although this is infrequent, the exact probability of the occurrence of infection has not yet been accurately determined. We believe that when we use the transabdominal method for CVS, the frequency of this complication may be the same as with amniocentesis. Following your CVS, you will be given an instruction sheet about how to watch for this and other complications of the test.</td>
<a href="" target="_blank">source</a>

5,492 Posts
beyond or added to risk is value systems- what are you going to do with the information?<br>
this is a copy of the review I have which shows that even after the procedure you may still need further testing-- so it is alot to go through with the possibility of more testing<br>
Cochrane Database Syst Rev. 2000;(2):CD000077.<br><br>
Early amniocentesis versus transabdominal chorion villus sampling for prenatal<br>
Alfirevic Z.<br><br>
Department of Obstetrics and Gynaecology, University of *********, *********,<br>
UK, L69 3BX. <a href="mailto:[email protected]*********">[email protected]*********</a><br><br>
BACKGROUND: A major disadvantage of amniocentesis is that test results are<br>
usually available only after 18 weeks gestation. Early amniocentesis can now be<br>
done between 9 to 14 weeks gestation. OBJECTIVES: The objective was to assess<br>
the safety and accuracy of early amniocentesis compared with chorion villus<br>
sampling. SEARCH STRATEGY: The Cochrane Pregnancy and Childbirth Group trials<br>
register and the Cochrane Controlled Trials Register were searched. Date of last<br>
search: October 1998. SELECTION CRITERIA: Randomised trials comparing early<br>
amniocentesis with transabdominal chorion villus sampling. DATA COLLECTION AND<br>
ANALYSIS: One reviewer assessed eligibility and trial quality. MAIN RESULTS:<br>
Three studies were included. Sampling failure was 0.4% in the early<br>
amniocentesis group compared to 2% in the chorion villus group (relative risk<br>
0.23, 95% confidence interval 0.08 to 0.65). Consequently, more women in the<br>
chorion villus sampling group needed a second prenatal diagnostic test (relative<br>
risk 0.43, 95% confidence interval 0.21 to 0.88). There were no statistically<br>
significant differences in the laboratory failures (relative risk 0.43, 95%<br>
confidence interval 0. 17 to 1.10) or number of women with various chromosomal<br>
abnormalities (relative risk 0.51, 95% confidence interval 0.26 to 1. 04).<br>
Combined total pregnancy loss in the early amniocentesis group was 6.2% (57/915)<br>
compared with 5% (46/917) in the chorion villus sampling group (relative risk<br>
1.24, 95% confidence interval 0.85 to 1.81). There were more spontaneous<br>
miscarriages after early amniocentesis (4.4% versus 2.3%, relative risk 1.92,<br>
95% confidence interval 1.14 to 3.23). There was no difference in the incidence<br>
of neonatal respiratory distress and anomalies in the newborn infants. The<br>
incidence of talipes was greater in the early amniocentesis group, although<br>
haemangiomas were more common in the chorion villus sampling group. REVIEWER'S<br>
CONCLUSIONS: Current data suggest that early amniocentesis is associated with a<br>
greater risk of spontaneous miscarriage and neonatal talipes compared to<br>
transabdominal chorion villus sampling. An increased risk of these complications<br>
needs to be weighed against fewer technical difficulties and the possibility of<br>
fewer neonatal haemangiomas.
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