With NTPT screening growing in popularity the cost has come down and there are now more options where you can go to get the testing done. Cane be done at 10 weeks pregnancy on, which is an earlier gestation than NTS screening (12 weeks).can check the sex of your baby (if you want).This is not possible with an NTS and serum. can check for sex chromosome disorders.So the need for invasive testing by CVS or amniocentesis is reduced considerably. has considerably fewer false-positive results than the NTS and serum.is more accurate than NTS and serum in detecting the commonest chromosomal abnormalities (Trisomy 21, 13 and 18),.The result of the simple blood test is predictive to more than 99.9% for Down Syndrome (Trisomy 21). The higher the percentage the more accurate the result. Sonic Genetics reports the percentage CfDNA in the specimen of maternal blood. NIPTing uses the smaller size of cfDNA to distinguish it and extract it from the maternal DNA.Ī blood sample taken from the pregnant mother at any time in the pregnancy from approximately 10 weeks on usually has enough of her baby’s placental DNA that can be checked for the commonest chromosomal disorders. CfDNA is significantly smaller in size than the maternal DNA in the bloodstream. CfDNA diminishes quickly after the birth of the baby so that it is no longer detectable in the maternal blood approximately two hours after birth. The amount of cfDNA increases as the pregnancy progresses.
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This placental DNA is called cell free DNA (cfDNA) and is almost always the same as baby’s DNA. Usually, now a woman with ‘high risk’ NTS will opt for an NIPT check.Ĭhromosomal abnormalities (such as Down syndrome) are abnormalities of the baby’s DNA (which is the ‘blueprint” of the human body).ĭNA originating from placental microparticles of the trophoblast of the placenta is shed into the mother’s bloodstream from as early as four weeks pregnant. How ‘high risk’ is usually defined is when the risk of miscarriage with a CVS or amniocentesis is less than the risk of the chromosome abnormality. These are invasive tests that carry a miscarriage risk of about 1:200 to 1:300. Women with a ‘high risk’ NTS result they are offered chorionic villous sampling (CVS) or amniocentesis. Sonic Genetics report a low-risk result as <1 in 10,000 risk of the checked chromosome having an abnormality. Checking for sex chromosome disorders and the sex of your baby is not possible with the NTS. In contrast, the NIPT has >99.9% accuracy in checking for the three commonest chromosome disorders and as well can check for sex chromosome disorders and so the sex of your baby. This is the combined test (ultrasound scan and serum) has a considered predictive value of about 92%. In addition, there is a checking of the levels of two pregnancy hormones to increase accuracy. This has been further refined by looking at the nose bone of the baby.
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The NTS looks at the skin fold on the back of the baby’s neck at about 12 weeks.
The cost of the Harmony NIPT through Sonic Genetics (DHM) has been reduced to $500. The cost has reduced considerably from what it was when NIPT screening was introduced and now through Sonic Genetics (Douglass Hanly Moir Pathology (DHM)), the NIPT testing is done in Australia.
This is a new non-invasive way of checking your baby’s chromosomes and so excluding the most common chromosome disorders with a very degree of accuracy, the Non-Invasive Prenatal Test (NIPT).Īmongst my patients, the Non-Invasive Prenatal Test (NIPT) is now far more popular than the Nuchal Translucency Scan ( NTS) and serum as a screening test for foetal chromosome disorders.
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