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Invasive Antenatal Tests |
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Invasive antenatal tests such as amniocentesis, chorionic villous sampling (cvs) and fetal blood sampling are able to detect fetal abnormalities especially chromosomal abnormalities such as Down's syndrome. Where a genetic disorder is known, such as in Thalassaemia (inherited blood disorder), a gene probe for the defect is used to test for the condition in the baby.
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| Since these tests are "invasive" (involves sampling with a needle or small cannula/tubing) there is a procedure-related risk of miscarriage between 0.5 to 1%. At FMGC, a recent audit (2006) showed that the risk of miscarriage is 1 in 300 (or 0.3%) for amniocentesis and 1 in 100 (or 1%) for cvs.
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| TIMELINE FOR INVASIVE PROCEDURES |
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