Why Some Clinicians Only Screen for One Condition, and What That Misses
Good Clinicians Still Miss Things
This isn't about bad providers. Most of the clinicians who missed something in your history weren't careless, and they weren't wrong about what they found. They just weren't looking at the whole thing.
Here's how it happens. A referral comes in for ADHD. The clinician screens for ADHD, finds it, confirms it, writes the report. Job done, from their perspective, because that was the question they were asked to answer. Nobody asked them to also screen for autism, so they didn't, not because autism wasn't relevant, but because it wasn't the assignment.
The reverse happens just as often. A referral comes in for autism. The evaluation focuses entirely on autism criteria. ADHD traits, impulsivity, time blindness, get folded into "autism-related executive dysfunction" instead of getting evaluated as their own condition, because the lens the clinician was using only had room for one diagnosis.
Why this isn't a small gap
A single-condition screening tool is built to answer a single-condition question. It's not designed to catch what's happening outside its own criteria. Ask an ADHD screener to catch autism and it mostly won't, because that's not what it's built to measure. The same is true in reverse. This isn't a flaw in the individual clinician. It's a structural limitation of screening for one thing at a time.
And once a diagnosis is written down, there's a real, human tendency, in both patients and providers, to stop looking. You have an answer. Why keep searching for a different one?
What a comprehensive evaluation does differently
It isn't built around a single referral question that gets answered and closed. It's built to look at your full clinical picture from the start, testing for autism, ADHD, and the overlap between them together, specifically so that a diagnosis of one doesn't accidentally close the door on the other.
This matters most for people who mask well, because a well-masked presentation is exactly the kind of thing a narrow, single-purpose screening is least equipped to catch. If you've been "high-functioning" your whole life, you've probably already slipped through more than one screening that wasn't built to see you.
If you've been told "it's just ADHD" or "it's just autism" and it never fully sat right
Trust that instinct. A comprehensive evaluation isn't about doubting the clinicians who came before you. It's about widening the lens, because sometimes the answer really was there the whole time. Nobody was ever asked to look for it.
Frequently Asked Questions
How could a trained clinician miss a diagnosis? Most evaluations are built to answer a specific referral question, such as "does this person have ADHD." A clinician using an ADHD-specific screening tool isn't necessarily looking for autism, not out of carelessness, but because that wasn't the scope of the assessment they were asked to conduct.
Does this mean my previous diagnosis is wrong? Not necessarily. It may be entirely accurate and simply incomplete. A previous ADHD or autism diagnosis can be correct while still leaving a second, undiagnosed condition unaddressed.
Why does masking make this more likely to happen? Well-masked autistic or ADHD presentations are specifically the kind of thing narrow, single-purpose screenings are least likely to catch, because masking is designed to look like "normal" functioning to an outside observer, including a clinician working from a limited screening tool.
How is a comprehensive evaluation structured differently? Rather than answering one referral question and stopping, a comprehensive evaluation is built to assess for autism, ADHD, and the overlap between them from the outset, so a diagnosis in one area doesn't prevent identification of the other.
Should I get a second opinion if my current diagnosis doesn't feel like it explains everything? Yes, that instinct is worth trusting. A comprehensive evaluation can look at what's still unexplained without dismissing what's already been accurately identified.
