The Harmony test has a false positive rate of 0.1%. For this reason, an invasive procedure such amniocentesis or chorionic villus sampling (CVS) would be recommended following a high probability Harmony result.Ĭurrent screening tests (Nuchal Translucency scan) have a false positive rate (that is, the results suggest a problem when the baby is in fact healthy) of around 4%. If the test result shows a high probability result, then the probability that your baby has a chromosomal abnormality is greater than 99%.Ī high probability result does not mean your baby definitely has a chromosomal abnormality although it is highly likely. ![]() If the test result shows a low probability result for a chromosomal abnormality, then your baby will have a probability of less than 1 in 10,000. The Harmony test is now one of the most predictive and accurate non-invasive tests available to predict the chance of your baby having a chromosomal abnormality. cfDNA can be tested to identify more than 99% of babies with Down’s syndrome (Trisomy 21), 98% of babies with Edwards syndrome (Trisomy 18) and 80% of babies with Patau’s syndrome (Trisomy 13). cfDNA is the result of the natural breakdown of fetal cells and can be found in the mothers blood. The test is a simple blood test taken from the mother which is then analysed for fetal cell-free DNA (cfDNA). ![]() The harmony test is a new non-invasive prenatal screening test (NIPT) which can be performed from 10 weeks gestation.
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