Patient and family counselling regarding findings of variants of uncertain significance (VOUS) and incidental findings in genetic testing - absence of prognostic information

The counselling challenge

A key counselling challenge with a variant of uncertain significance (VOUS) result is the absence of prognostic information - the family cannot be told whether the variant explains the clinical picture, what the future disease course might be, or what risk it confers to relatives
VOUS results are increasingly common as broader gene panel and genome-wide testing becomes routine, making this counselling scenario a frequent, not rare, part of clinical genetics practice

Because a VOUS cannot be confidently classified as pathogenic or benign, it cannot be used to predict outcome, guide surveillance intensity, or inform relatives' risk with any confidence - the diagnostic question that prompted testing often remains genuinely unanswered

Explicitly and clearly explain what a VOUS does and does not mean - it is not a "positive" or "negative" result in the way a clearly pathogenic or benign result would be, and using management-changing language ("you have the gene for X") before classification is finalised risks causing harm through premature, unsupported action

Management should proceed based on clinical assessment alone (family history, phenotype), not on the VOUS result, while classification remains unresolved
Arrange for the family/clinician to be notified if/when the variant is reclassified, and consider whether family segregation studies could help resolve the classification sooner (see variants of uncertain significance for detail)

Uncertainty tolerance in medical communication, genetic counselling communication skills, shared decision-making under diagnostic uncertainty

Counselling for a VOUS is fundamentally a conversation about living with uncertainty, not delivering a result - families often find this harder to process than either a clearly reassuring or clearly concerning result, and dedicated counselling time/support is warranted

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