Why Is Predictive Testing for Huntington Disease Avoided for a 4-Year-Old

Why is predictive testing for Huntington disease avoided for a 4-year-old child who has one grandparent with the disorder?

A) Unless one of the parents is positive for the gene mutation, a negative finding would be noninformative.
B) The Huntington disease mutation is poorly penetrant and may never be expressed even when inherited.
C) A 4-year-old child cannot understand or participate in the genetic counseling process.
D) There are no effective primary or secondary prevention strategies for this disorder.

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