Hypoplasia of the nasal bone is an ultrasonographic observation of the fetal nasal bone, which appears smaller by varying degrees. It is associated with Down syndrome, where nasal bone hypoplasia has emerged as one of the most vital morphological markers of trisomy 21.
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Can nasal bone length be an indicator of Down's syndrome?
Query: Hi doctor, My quadruple test is normal. After 23 weeks of gestation, I took an anomaly scan, which shows 3.6 mm nasal bone. Is the nasal bone underdeveloped? What are the chances of Down's syndrome? We do not want to get an amniocentesis test done as it increases the chance of miscarriage. Previousl... Read Full »
Answer: Hi, Welcome to icliniq.com. The nasal bone thickness is relevant only between 11 to 13 weeks pregnant scan where it should be less than 0.08 inches. Nasal bone thickness at 23 weeks gestation is irrelevant. If the quadruple test shows low risk of Down's syndrome, then amniocentesis (a test used to ... Read Full »
My baby's ultrasound revealed a Down syndrome risk. Why?
Query: Hi doctor, I am 19 years old. I am 21 weeks pregnant now. I did an ultrasound yesterday. I was told that my baby is about two weeks smaller than it should be at 21 weeks. I was also told that my baby's nasal bone is hypoplastic and not very visible. My baby is at risk of having Down's syndrome. I w... Read Full »
Answer: Hi, Welcome to icliniq.com. In the case of a history of irregular periods, there could be a discrepancy between dates and scan finding. So there is no need for worrying. If the growth is not healthy for the baby or if the growth is restricted, then you should take it as a concern. You are going to... Read Full »
Does a hypoplastic nasal bone suggest Down syndrome?
Query: Hi doctor, I am a 29-year-old pregnant woman and went through an anomaly scan. An anomaly scan showed hypoplastic nasal bone in the baby that might lead to Down syndrome. However, in my third-month NT scan, the baby's nasal bone was seen. Also, in the double marker test, Down syndrome was at low r... Read Full »
Answer: Hello, Welcome to icliniq.com. I understand your concern. NT (nuchal translucency)scan and double marker are screening tests that only tell if the baby is at high or low risk for Down syndrome. It does not rule it out completely. Hypoplastic nasal bone (not well-developed nasal bone) is only one o... Read Full »
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