A 28-year-old man with a 3-year history of specific phobia (fear of flying) is being evaluated for cognitive-behavioral therapy. He experiences intense anxiety and avoidance whenever he anticipates air travel. His therapist requests a baseline assessment tool to measure the severity of phobic anxiety and track treatment response. Which investigation is most appropriate for this purpose?

Explanation

## Assessment Tool of Choice for Specific Phobia ### Why SCID-5 and Fear Survey Schedule? **Key Point:** Specific phobia diagnosis and severity assessment rely on **structured clinical interviews and validated self-report rating scales**, not neuroimaging. The SCID-5 confirms DSM-5 diagnostic criteria, while the FSS quantifies phobic anxiety severity and tracks treatment response. ### Diagnostic and Assessment Tools in Phobia | Tool | Purpose | Clinical Use | |------|---------|---------------| | **SCID-5** | Structured diagnostic interview | Confirms DSM-5 panic/phobia diagnosis; rules out other anxiety disorders | | **Fear Survey Schedule (FSS)** | 80-item self-report scale | Quantifies phobic anxiety; tracks response to therapy | | **Anxiety Sensitivity Index (ASI)** | Measures fear of bodily sensations | Complements FSS in panic/phobia assessment | | **PET/fMRI** | Neuroimaging of amygdala activation | Research tool; NOT indicated for routine clinical diagnosis | | **EEG** | Electrical brain activity | No role in phobia assessment | **High-Yield:** SCID-5 is the gold-standard diagnostic interview for all DSM-5 anxiety disorders. FSS is the most widely used self-report measure for specific phobia severity and treatment monitoring. ### Clinical Pearl Neuroimaging (PET, fMRI) may show amygdala hyperactivation in phobic patients, but these are **research tools**, not clinical diagnostic instruments. They are expensive, time-consuming, and not reimbursed for routine phobia assessment. Structured interviews and rating scales are the standard of care in clinical practice. ### Assessment Workflow in Specific Phobia ```mermaid flowchart TD A[Patient with suspected phobia]:::outcome --> B[SCID-5 diagnostic interview]:::action B --> C{DSM-5 criteria met?}:::decision C -->|Yes| D[Administer Fear Survey Schedule]:::action C -->|No| E[Consider other anxiety disorder]:::outcome D --> F[Baseline FSS score obtained]:::outcome F --> G[Initiate CBT/exposure therapy]:::action G --> H[Re-administer FSS at 4-week intervals]:::action H --> I[Track treatment response]:::outcome ``` **Mnemonic:** **SCID-FSS** — **S**tructured **C**linical **I**nterview for **D**SM-5, then **F**ear **S**urvey **S**cale for severity and tracking.