Hi, my Sister went for an anomaly scan and the doctor said that the baby has "unossified nasal bone" We are really concerned and would like to know what are the chances of the baby having a down syndrome?
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Hi, thank you for the question. The unossified nasal bone seen on a scan in second trimester of pregnancy is seen 6 times more commonly in fetuses with Down syndrome as compared to normal fetuses. This likelihood is not same when unossified nasal bone is seen in first trimester only, in case of which we repeat scan in second trimester. Considering that your sister went for an anomaly scan, I presume that she is in at least 18th week of her pregnancy and hence the second trimester. As a result of the above reason, it is definitely suggested for your sister to undergo confirmatory testing for Down syndrome by Amniocentesis and fetal Karyotype. At the same time, it is not necessary that a fetus with unossified nasal bone definitely has Down syndrome. Hence, no decision should be taken without confirmatory testing.
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