Ultrasound can be used to identify fetuses with trisomy 18 because it can directly visualize chromosomes in a cell.

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Ultrasound cannot directly visualize chromosomes in a cell. Instead, ultrasound can detect physical abnormalities that may indicate a higher risk for trisomy 18. A definitive diagnosis would require further testing, such as amniocentesis or chorionic villus sampling, which can analyze fetal cells for chromosomal abnormalities.

Ultrasound Can Be Used to Identify Fetuses with Trisomy 18