What is considered an abnormal range for a fetus to have a shorter nasal bone?

Patient's question:

Patient Age: Hello everyone, today I am 22+4 weeks and had an anomaly ultrasound. The results showed that the child's biparietal diameter (BPD) is 5.9 cm, but the nasal bone is only 0.49 cm. I didn't notice it at the time, but later when I searched online, I found that other children's nasal bones are longer than this. I checked some relevant materials and found that a BPD/nasal bone ratio of 10 or higher is considered normal. My ratio of 5.9/0.49 is over 12—is this indicative of chromosomal abnormalities? The doctor in the clinic was too busy and just gave a quick glance without saying much. Could any experienced doctors help me with this? I would be very grateful.

Doctor's answer:

Analysis of the condition: At this gestational age, it is generally around 0.8 cm. This is shorter than usual. It is recommended to have a follow-up examination or further tests.
Guidance: You can undergo a chromosomal test or a Down syndrome screening to rule out any abnormalities. Currently, it cannot be accurately determined. We know that chromosomal abnormalities can cause significant harm to the child. If treatment is not initiated promptly or if the wrong treatment method is used, the condition can progress rapidly, causing great harm to the child. Therefore, it is crucial to seek professional medical treatment at a specialized hospital in a timely manner. This is the key.

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