If the nasal bone is found to be unossified and unilateral during a 12-week NT scan, it may indicate a potential risk for certain genetic conditions such as Down syndrome. However, it is important to note that this finding alone does not provide a definitive diagnosis. Further diagnostic tests, such as amniocentesis or chorionic villus sampling (CVS), may be recommended by your healthcare provider to obtain more accurate information.
It is also worth mentioning that an unossified and unilateral nasal bone can sometimes occur due to fetal positioning during the ultrasound examination. In such cases, repeating the scan at a later stage or using alternative imaging techniques like 3D ultrasound can help provide more clarity.
If you are concerned about the findings of your NT scan, it is best to consult with your healthcare provider who can provide personalized guidance based on your specific situation and medical history. They will be able to explain the potential risks and recommend any further testing or monitoring that may be necessary.