The Graduate Student Who Is Certain She Has ADHD
Ms. K., 29, is a second-year doctoral student who self-refers two weeks before qualifying exams. She reports 'lifelong' difficulty focusing and has taken several online ADHD screeners, all positive. She wants an evaluation and, if diagnosed, a letter for 50% extended time and a stimulant prescription. She has read widely about ADHD and states, 'I'm certain this is what I have; my last therapist agreed.' Over the past eight weeks she reports sleeping 4-5 hours a night, low mood, and poor appetite following a breakup; her PHQ-9 is 16. Childhood records include a second-grade report card marked 'does not apply herself.' Her mother, reached by phone with Ms. K.'s written consent, describes her as 'a normal kid, a bit of a daydreamer, no problems until high school.' She has no history of psychological testing.
1. What is your differential, and what would you need before giving an opinion?
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Differential, roughly in order of current likelihood: major depressive disorder (concentration difficulties, insomnia, appetite change, anhedonia, clear eight-week onset after a stressor); generalized anxiety; a sleep disorder; a medical contributor (thyroid, anemia, caffeine); and ADHD, which remains possible but is not yet established.
The key diagnostic hinge is chronology. ADHD requires several symptoms present before age 12, in two or more settings, causing impairment, and not better explained by another condition. Her mother's account - daydreamy but no problems until high school - and a report card comment about effort are thin support for childhood onset, and the eight-week mood episode is a far better explanation for the current complaints.
What you need:
- A structured diagnostic interview covering ADHD, mood, anxiety, trauma, and substance use.
- Collateral from at least one other informant plus partner or close friend if available, with written consent.
- School records, not just the one report card.
- Standardized ratings from two informants.
- Screening for medical contributors.
- A clear picture of current functional impairment - she has reached doctoral candidacy, which does not rule out ADHD but raises the bar for documenting impairment.
Do not diagnose on a single session, and treat the depression first or concurrently; depressive symptoms reliably inflate self-reported attention problems.
2. Ms. K. asks you to complete the evaluation today so she can submit the accommodation request before the exam. How do you handle this, and what are the pitfalls?
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Acknowledge the deadline, then decline the compression. The urgency is real, but the exam date is not a clinical reason to lower the standard of evidence, and a report produced in one session under time pressure is exactly the kind that does not survive scrutiny by a review committee or a licensing board.
Offer a staged plan: full diagnostic intake now, initiate treatment for the depressive episode, gather collateral and records over the next two weeks, and complete the evaluation across two or three sessions. If, and only if, the evidence is sufficient partway through, you can provide an interim letter describing documented findings without asserting a diagnosis you have not established.
Pitfalls to name for yourself:
- Expectancy effects. A client who knows a diagnosis yields accommodations may report symptoms differently - this is not the same as malingering, and treating her as dishonest would damage the alliance and the data.
- Diagnostic momentum. A prior therapist's agreement and a pile of positive online screeners are not evidence; screeners trade specificity for sensitivity by design.
- Role confusion. You are the evaluator; if you also become her therapist, be explicit about how that affects your objectivity and document it.
- Prognosis of the request. Being asked for a letter is a normal part of adult ADHD assessment, not a red flag, but the quality of the resulting evaluation should not shift because a letter is wanted.
3. Her self-report ADHD scale is at the 98th percentile and she scored 78 on a well-known adult ADHD self-report measure. How should you weigh these?
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Heavily discounted, for three reasons.
- Base rate and specificity. ADHD self-report scales are sensitive but not specific. In clinical samples, depressed and anxious patients routinely score in the clinical range on ADHD measures because the items are about concentration, restlessness, and task completion - symptoms depression produces directly.
- Ceiling effects. The 98th percentile adds almost no information beyond 'very high'; it does not discriminate among explanations.
- Shared method variance. Self-report predicting self-report. The incremental validity of a collateral report or school record exceeds that of another self-report scale.
What would actually move the needle: a corroborating childhood history from an independent informant, school records showing early onset, evidence of impairment in a second setting (home versus work), and a re-administration of the self-report after the depression remits - if the scores normalize with mood, the attention complaints were depressive.
On performance-based measures like continuous performance tests: they can support a diagnosis but are frequently normal in adults with genuine ADHD, and abnormal in depressed or sleep-deprived adults, so a normal or abnormal result should not be decisive either way. The diagnosis is clinical, based on history and impairment, with testing as corroboration.