NR 547 / NR547
FINAL EXAM — ENHANCED STUDY GUIDE
Differential Diagnosis in Psychiatric-Mental Health Across the Lifespan
Original Q&A; Review • Clinical Reasoning • Exam-Style Practice • Rationales
Source orientation: The supplied Stuvia listing is a 68-page Q&A; exam-review resource for NR547 and publicly exposes a short
preview focused heavily on delirium, neurocognitive disorders, aging, and screening tools. This guide uses those visible themes
plus broader NR547-relevant differential-diagnosis concepts to create a new, expanded study resource. It does not reproduce or
reconstruct the locked 64 pages.
Use: Answer before reading the rationale. For clinical vignettes, identify time course, impairment, substance/medication exposure,
medical causes, and the key feature that separates the competing diagnoses.
NR 547 • Enhanced Differential Diagnosis Study Guide Page 1
, CONTENTS
1. Differential Diagnosis Framework
2. Neurocognitive Disorders & Delirium
3. Depressive & Bipolar Disorders
4. Anxiety, Trauma & OCD-Related Disorders
5. Psychotic Disorders
6. Personality & Impulse-Control Presentations
7. Substance-Related Disorders
8. Lifespan & Special-Population Differential Diagnosis
9. Suicide Risk & Psychiatric Emergencies
10. Screening Tools & High-Yield Comparisons
11. Mixed Final Practice — 40 Questions
12. Answer Key, Rationales & Exam Traps
NR 547 • Enhanced Differential Diagnosis Study Guide Page 2
, 1. DIFFERENTIAL DIAGNOSIS FRAMEWORK
1. Question: What is the primary purpose of a psychiatric differential diagnosis?
Answer: To build and prioritize a working list of plausible explanations for the presentation, then systematically distinguish
among psychiatric, substance/medication-induced, and medical/neurologic causes. The goal is not simply to match
symptoms to one diagnosis.
2. Question: Why should medical and substance causes be considered early?
Answer: Because psychiatric symptoms can be caused or amplified by endocrine, neurologic, infectious, metabolic,
medication, intoxication, and withdrawal states. Missing a medical cause can delay urgent treatment.
3. Question: What historical feature is especially important before diagnosing Major Depressive Disorder?
Answer: A careful history of past mania or hypomania. A depressive presentation may be part of bipolar disorder, and
treating bipolar depression as unipolar depression can alter risk and treatment decisions.
Exam trap: Do not diagnose MDD solely because the current episode looks depressive.
4. Question: What should be assessed when a patient presents with new-onset psychosis?
Answer: Timeline, substances/medications, delirium features, medical and neurologic symptoms, mood symptoms, family
history, functional decline, and the relationship between psychosis and mood episodes.
5. Question: Why is time course so important in differential diagnosis?
Answer: Many psychiatric disorders are separated by duration and temporal relationships. Acute fluctuating symptoms
suggest a different differential from chronic, stable personality traits or months of progressive cognitive decline.
6. Question: What is diagnostic overshadowing?
Answer: The tendency to attribute new symptoms to an existing psychiatric, developmental, or cognitive diagnosis and
overlook a new medical, substance-related, or psychiatric condition.
7. Question: What is the value of collateral information?
Answer: Family, caregivers, teachers, partners, and prior records can establish baseline functioning, timeline, medication
adherence, substance exposure, and changes the patient may not recognize or remember.
8. Question: What is the safest approach when diagnostic information is incomplete?
Answer: Use a provisional or working diagnosis when appropriate, document uncertainty, gather additional data, and avoid
false precision. Reassess as longitudinal information becomes available.
NR 547 • Enhanced Differential Diagnosis Study Guide Page 3
FINAL EXAM — ENHANCED STUDY GUIDE
Differential Diagnosis in Psychiatric-Mental Health Across the Lifespan
Original Q&A; Review • Clinical Reasoning • Exam-Style Practice • Rationales
Source orientation: The supplied Stuvia listing is a 68-page Q&A; exam-review resource for NR547 and publicly exposes a short
preview focused heavily on delirium, neurocognitive disorders, aging, and screening tools. This guide uses those visible themes
plus broader NR547-relevant differential-diagnosis concepts to create a new, expanded study resource. It does not reproduce or
reconstruct the locked 64 pages.
Use: Answer before reading the rationale. For clinical vignettes, identify time course, impairment, substance/medication exposure,
medical causes, and the key feature that separates the competing diagnoses.
NR 547 • Enhanced Differential Diagnosis Study Guide Page 1
, CONTENTS
1. Differential Diagnosis Framework
2. Neurocognitive Disorders & Delirium
3. Depressive & Bipolar Disorders
4. Anxiety, Trauma & OCD-Related Disorders
5. Psychotic Disorders
6. Personality & Impulse-Control Presentations
7. Substance-Related Disorders
8. Lifespan & Special-Population Differential Diagnosis
9. Suicide Risk & Psychiatric Emergencies
10. Screening Tools & High-Yield Comparisons
11. Mixed Final Practice — 40 Questions
12. Answer Key, Rationales & Exam Traps
NR 547 • Enhanced Differential Diagnosis Study Guide Page 2
, 1. DIFFERENTIAL DIAGNOSIS FRAMEWORK
1. Question: What is the primary purpose of a psychiatric differential diagnosis?
Answer: To build and prioritize a working list of plausible explanations for the presentation, then systematically distinguish
among psychiatric, substance/medication-induced, and medical/neurologic causes. The goal is not simply to match
symptoms to one diagnosis.
2. Question: Why should medical and substance causes be considered early?
Answer: Because psychiatric symptoms can be caused or amplified by endocrine, neurologic, infectious, metabolic,
medication, intoxication, and withdrawal states. Missing a medical cause can delay urgent treatment.
3. Question: What historical feature is especially important before diagnosing Major Depressive Disorder?
Answer: A careful history of past mania or hypomania. A depressive presentation may be part of bipolar disorder, and
treating bipolar depression as unipolar depression can alter risk and treatment decisions.
Exam trap: Do not diagnose MDD solely because the current episode looks depressive.
4. Question: What should be assessed when a patient presents with new-onset psychosis?
Answer: Timeline, substances/medications, delirium features, medical and neurologic symptoms, mood symptoms, family
history, functional decline, and the relationship between psychosis and mood episodes.
5. Question: Why is time course so important in differential diagnosis?
Answer: Many psychiatric disorders are separated by duration and temporal relationships. Acute fluctuating symptoms
suggest a different differential from chronic, stable personality traits or months of progressive cognitive decline.
6. Question: What is diagnostic overshadowing?
Answer: The tendency to attribute new symptoms to an existing psychiatric, developmental, or cognitive diagnosis and
overlook a new medical, substance-related, or psychiatric condition.
7. Question: What is the value of collateral information?
Answer: Family, caregivers, teachers, partners, and prior records can establish baseline functioning, timeline, medication
adherence, substance exposure, and changes the patient may not recognize or remember.
8. Question: What is the safest approach when diagnostic information is incomplete?
Answer: Use a provisional or working diagnosis when appropriate, document uncertainty, gather additional data, and avoid
false precision. Reassess as longitudinal information becomes available.
NR 547 • Enhanced Differential Diagnosis Study Guide Page 3
