NRNP 6635 psychiatric evaluation: anxiety, PTSD, OCD

The title groups three things the manual you are told to use keeps apart, and that gap is where the assignment's hardest requirement lives.

Anxiety disorders, PTSD and OCD sat in one chapter under DSM-IV. DSM-5 separated them into three: anxiety disorders, obsessive-compulsive and related disorders, and trauma- and stressor-related disorders. The reorganisation was not cosmetic. Every condition in the trauma chapter requires exposure to a traumatic or stressful event as a diagnostic criterion, which is a gate no anxiety disorder has; and the obsessive-compulsive chapter was created to reflect the relatedness of those conditions to one another and their distinction from anxiety disorders. So the assignment's own title reflects the teaching convenience of covering them in one week, while the diagnostic logic you are being asked to demonstrate runs along the boundaries the manual drew when it split them. Treating the three as one family is comfortable and it will cost you the sharpest exclusions available in the whole assignment.

That matters because of the sentence in the Assessment section that most evaluations answer badly. It does not ask you to justify your primary diagnosis. It asks you to compare the DSM-5 criteria for each differential and explain what DSM-5 criteria rules out the differential diagnosis. Ruling out is a different cognitive operation from choosing. Choosing asks which diagnosis fits best, and is satisfied by an impression. Ruling out asks which specific criterion the patient fails, and is satisfied only by a criterion and a fact about this patient. A list of three plausible diagnoses followed by a paragraph explaining why the first one fits best has answered the question that was not asked, and it will read as competent right up until a marker checks whether any criterion was actually applied to any patient fact.

The chapter split hands you the cleanest rule-outs available, because criteria that function as gates are easier to fail definitively than symptom counts. Criterion A for PTSD requires exposure to actual or threatened death, serious injury, or sexual violence, through direct experience, witnessing it, learning of it happening to a close relative or friend, or repeated professional exposure to aversive details. If your patient's history does not contain such an event, PTSD is excluded no matter how well the symptom picture otherwise matches — and saying that, with the criterion named, is exactly what the prompt is asking for. Duration criteria work the same way and are even cleaner, because a date is a fact rather than a matter of clinical weighting, and two clinicians cannot reasonably disagree about whether a month has passed.

Pertinent negatives are the requirement that makes those rule-outs possible, and they are the most commonly omitted element of a psychiatric evaluation. A pertinent negative is a symptom you specifically asked about and the patient specifically denied. It is not the absence of a note. If your evaluation does not record that you asked about a qualifying traumatic event and the patient denied one, you have not documented the exclusion of PTSD — you have simply not mentioned it, and a reader cannot tell the difference between an exclusion and an oversight. Every differential you rule out should have a corresponding negative in the subjective section, which means the interview questions you plan before the session are what determine whether the assessment section can be written at all. This is the point at which the assignment stops being a writing task and becomes a planning one.

This is why the preparation instruction to consider what interview questions you would need is not a warm-up exercise. Your three differentials should be chosen before the session in outline, and each should generate the questions whose answers would eliminate it. Working the other way round — watching the case, forming an impression, then assembling differentials that make the impression look considered — produces an evaluation with no negatives in it, because you never asked anything you expected to be denied. The order of operations is the difference between a document that demonstrates diagnostic reasoning and one that reports a conclusion. It is also visible in the finished evaluation: an assessment section built forwards has negatives distributed through the subjective findings, and one built backwards has none, because nothing was ever asked that the writer expected to be denied.

The reflection section contains an instruction with an exclamation mark, which is unusual enough to take literally: demonstrate critical thinking beyond confidentiality and consent for treatment. Those two are pre-emptively barred, and a reflection that discusses them anyway has ignored an explicit boundary. What remains is more interesting territory — duty to protect where a patient discloses risk to a named person, mandatory reporting obligations triggered by disclosures of abuse, capacity to consent as distinct from consent itself, the threshold for involuntary evaluation, boundary and disclosure questions specific to trauma work, and what happens to a psychiatric record when it is subpoenaed. Pick one and treat it properly rather than listing several. Depth is what the instruction is asking for, since the excluded pair are precisely the two that every student can name without thinking, and naming three more without developing any of them repeats the failure in a different vocabulary.

The health promotion element of the reflection is also more specific than it appears, since it names age, ethnic group, past medical history and socioeconomic and cultural factors. Those are not decoration on a paragraph about wellbeing. They change what screening is indicated, what the differential should have included, and what a realistic plan looks like — which means the reflection is asking you to revisit the assessment with those factors in view rather than to add a paragraph of good intentions at the end. Something that would have changed your differential is worth more here than anything that would only have changed your rapport, and the same test applies to the opening question about what you would do differently: an answer naming a question you failed to ask beats any amount of reflection on how the session felt.

Two mechanical points. The evaluation goes into the supplied template, so its section order is fixed and your job is what goes in each, not how to arrange them. And the file naming convention is stated exactly, which is the kind of instruction that costs marks silently when ignored.

Choose the differentials before the interview, ask the questions that would kill them, record the denials, and rule out by criterion rather than by impression.