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Missed NT scan, Down syndrome positive 5th month scan normal..need amniocentesis?

Hi
We missed NT scan for my wife as she was taking care of her sick old mother during the third month. Then we were asked to do normal Doppler and down syndrome triple marker. Trisomy21, 18 both came positive. Doctors asked us to wait for 5th month sca. The resukts of 5th no th scan are all ok structurally. The doctors now say that amniocentesis or NIPT test only will reveal any abnormalities. Can we rely on these tests? How far they are true. Has anyone given birth to normal children despite positive result from NIPT or Amniocentesis too. Please advise.
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13167 tn?1327194124
ConfusedABit,  this is worrisome,  for sure.  NIPT is somewhere between 80 to 90 per cent accurate for Downs or other chromosomal abnormalities.  This is something for you to talk to your doctor about - there are risks that come with undergoing an amnio,  and since the scan looks normal,  you have some decisions to make.  

It's certainly heartening that the 5th month scan looks good.

Best wishes.
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