The Harmony non-invasive prenatal test is available as early as 10 weeks of pregnancy. ![]() Teamed with my bloods it gave us a reading of 1 in 59 chance of one of the trisomys. Amniocentesis results are accurate 99.9% of the time. We got the very sad news today at our 12w scan that babys nuchal translucency was a bit high (2.9mm when the highest it should be for a gestation of 12+6 is 2.4mm). Amniocentesis is associated with a small risk of miscarriage (approximately 0.5%). An amniocentesis is usually performed around or after the 16th week of pregnancy. The fluid is then sent to the laboratory to test the chromosomes.
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