When the lab does a specific gene test, they don't do full genome sequencing. I don't know why this is difficult to understand. Even if a family member does th

When the lab does a specific gene test, they don't do full genome sequencing. I don't know why this is difficult to understand. Even if a family member does the same test later, the same logic applies. The two results can't then be linked because their full genomes were not sequenced, and wouldn't be cost effective to sequence anyway.