What is the role of collateral information in a biopsychosocial assessment?

• A. Never use collateral information.
• B. Use collateral information when available and appropriate to supplement client information and diagnostic formulation.
• C. Only with client permission to share everything.
• D. Collateral information replaces direct client data.

Answer: (B)

Collateral information adds important perspectives and corroboration to what the client reports, enriching the biopsychosocial assessment. By contacting family members, teachers, medical providers, or reviewing prior records, you can observe functioning across settings, verify symptoms, and fill in gaps the client may not disclose. This helps create a more accurate diagnostic formulation by highlighting patterns, history, and environmental factors that influence functioning. It also informs treatment planning by revealing supports, risk factors, and barriers to change in the client’s life. When collecting collateral data, obtain informed consent, respect privacy, and consider the relevance and reliability of each source, while being aware of potential biases or outdated information. Use collateral information when available and appropriate to supplement client information and diagnostic formulation, and avoid letting it replace the client’s own report or clinical judgment. If discrepancies arise, discuss them with the client and consider how different contexts or perceptions might explain them.