It's about 98% accurate for Downs I believe and the 2% wrong answers are false positives so if you got a positive you could then have an invasive test if you wanted to be absolutely sure. The NIPT/cfDNA Performance Caclulator is a tool to quickly and easily understand the positive predictive value of a prenatal test given the condition. So you don't get a "risk percentage" you get told "yes Downs" or "no Downs". I was livid because I specifically told them I was doing cash pay (130) since I knew my insurance wouldn't cover most of the cost. The Harmony/NIPT test is definitive - it's looking for fragments of foetal DNA in the mothers' blood I think and checking the chromosomes of that. I got the Harmony test done back in November and the lab that drew it sent the claim to my insurance. However (a) obviously even those with "high risk" results may well not have Downs - a 1 in 150 chance is still very small and on the flip side (b) there are lots of babies born with Downs (about 25% I think?) whose mothers were given a "low risk" result. Anything higher than 1 in 150 is "high risk" and you can have further (invasive) testing if you want. The test can be done at any dynacare lab and cost me exactly 495 (no insurance coverage). So for example you'd be told "based on your blood hormones and the scan, we think there is a 1 in 2000 chance the baby has Downs". Harmony Test - Review: Thought I would share my experience here for future readers :) I did a Harmony blood test at 11w5d in Manitoba. Blondes the standard 12 week NHS screening tells you the % risk that your baby has Downs/Edwards/Patau, based on the scan and some hormone tests.
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