I am 21 week pregnant. My all reports are normal i.e. (nt/nb, dual marker, anomaly scan,) but in fetal echo it come arsa. My gynae recommend me nipt result are in waiting. But I am very tensed I do not know if all reports are normal how it come. Pls help.

Dr. Girish DaniGynaecologist51yrs exp

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Arsa is observed in approximately 2% of normal individuals. On the other hand, the reported incidence of arsa varies between 25 and 37% in cases with down syndrome and other chromosomal abnormalities. Nt/nb, dual marker tests are statistical reports giving per cent chances not yes or no. Anomaly scan rules out other abnormalities and indicators for down's or other chromosomal disaeas not yes or no for down's or other chromosomal. It is important to know limitations of each test instead of thinking it is normal.  

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