What is the accuracy of my CVS/Amniocentesis results?
The usual reason for performing one of these tests is to check the fetal chromosomes (the karyotype). Both are very accurate. Misleading results are measured in terms of false positives (the test detects something when the baby is unaffected) and false negatives (the test is normal when the baby is actually affected). False positives and false negatives are lower for an amniocentesis than for a CVS.
