Assessment and Diagnosis
What the candidate must know
Assessment covers the tools and reasoning used to describe a client's functioning: the mental status examination (appearance, affect, thought process, cognition, insight, judgment), structured and unstructured interviews, standardized instruments, and the diagnostic frameworks that organize findings.
Know the difference between screening tools (brief, flag risk, not diagnostic), diagnostic instruments (structured interviews tied to criteria), and symptom severity measures (track change over time). Familiarity with reliability (consistency) versus validity (accuracy) is essential; a reliable tool can still be invalid for a given population.
Traps in questions
- Confusing screening with diagnosis. A positive screen is a prompt for further assessment, not a diagnosis.
- Assuming a culturally normative behavior is pathological. Questions often describe grief, spiritual experience, or language differences that mimic symptoms.
- Ignoring base rates and setting. A symptom that is common in the population is less informative than a rare one.
- Treating a single score as truth. Always integrate history, collateral, and observation.
Rule of thumb
Diagnosis requires that symptoms cause clinically significant distress or impairment, are not better explained by another condition, and are not simply a culturally sanctioned response. When a vignette includes a recent stressor and symptoms that resolve with it, suspect an adjustment or normative reaction rather than a chronic disorder.
Worked example
A client reports low mood for two weeks after a job loss, sleeps poorly, and still enjoys time with family. The candidate should note that anhedonia is absent and functioning is largely preserved, so a full major depressive episode is not clearly supported; further assessment and monitoring are indicated.