Diagnosis & Assessment

Assessment and Diagnosis is both a knowledge area and the focus of two of the AANPCB's four process domains: Assess (33% of scored questions) and Diagnose (21%). Together, these domains represent over half the exam. The AANPCB tests whether you can gather appropriate information, interpret it correctly, generate a differential, and arrive at an accurate diagnosis.

The Assess domain tests comprehensive psychiatric evaluation skills — obtaining relevant history, performing mental status exams, conducting risk assessments, ordering appropriate labs and screening instruments, and gathering collateral information. The Diagnose domain then tests your ability to synthesize that information: interpreting screening tool results, formulating differential diagnoses, prioritizing differentials, recognizing urgent conditions, and establishing primary and secondary diagnoses using current diagnostic criteria.

The AANPCB organizes clinical disorders into three frequency tiers. Group 1 disorders (mood disorders, anxiety disorders, trauma-related disorders, substance use) appear most frequently. Group 2 (psychotic disorders, personality disorders, neurodevelopmental disorders) appear moderately. Group 3 (dissociative, somatic symptom, sleep-wake, feeding/eating in certain age groups) appear least frequently. Study time should be weighted accordingly.

• ✕Underweighting the Assess domain. At 33%, it is the single largest domain on the AANPCB exam. Students often rush to diagnostic conclusions without demonstrating competence in gathering the right information first — the exam tests process, not just the final answer.
• ✕Not knowing which screening instruments to use for which conditions. The AANPCB tests evidence-based instrument selection: PHQ-9 for depression, GAD-7 for anxiety, AUDIT-C for alcohol use, C-SSRS for suicide risk, MDQ for bipolar screening, Vanderbilt for ADHD in children. Know what each tool measures and its limitations.
• ✕Confusing the duration and symptom count criteria for disorders that look similar. Hypomania requires 4 days (not 7), PTSD requires symptoms beyond 1 month, persistent depressive disorder requires 2 years. The AANPCB tests these distinctions in vignette format where the timeline is embedded in the clinical history.
• ✕Ignoring the three-tier disorder grouping when allocating study time. If you spend equal time on Group 3 disorders as Group 1, you are misallocating effort. Mood disorders, anxiety, trauma, and substance use should receive the most preparation.
• ✕Failing to consider medical differentials. The Assess domain specifically tests ordering appropriate diagnostic and laboratory tests. Questions about thyroid function, B12 deficiency, urinalysis, and RPR screen test whether you rule out organic causes before making a psychiatric diagnosis.