Why is non-invasive genetic testing mainly needed?

Patient's question:

Hello doctor! I previously had a non-invasive genetic test, and just received the results showing no obvious abnormalities in chromosome 13, 18, and 21. However, the report states that this test cannot rule out other chromosomal abnormalities, genomic abnormalities, or genetic diseases caused by gene mutations that may lead to intellectual disabilities, deformities, or other conditions! What does this mean? Doctor, please help me, thank you!

Doctor's answer:

Analysis of the condition: This result belongs to genetic testing.
Guidance: This means that these chromosomes are normal, and these common ones prone to variation have not changed. It's not a major issue.

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