ADHD Testing in English in Tokyo: WAIS-IV, Rating Scales, and What to Expect
There is no single test that diagnoses ADHD, in Japan or anywhere else. The diagnosis is clinical, made through structured interviews about your life now and in childhood. Tests support that process, but no score settles the question by itself. The visits around the tests, from booking to diagnosis, are in our step-by-step diagnosis guide.
What are the three layers of an ADHD assessment?
An interview, rating scales, and cognitive testing; the interview carries the diagnosis, and the other two support it.
- The clinical interview: the core of the diagnosis. It covers current symptoms across settings, childhood history, and the conditions that mimic or accompany ADHD.
- Rating scales: standardized questionnaires such as the ASRS (a short screener) and the CAARS (a fuller adult scale), sometimes with an observer version filled in by someone who knows you well. Because the diagnosis requires that symptoms began in childhood, the WURS is also used, which asks you to look back at your own childhood behaviour; for adults who cannot ask a parent, this is one of the ways the childhood requirement is met. If autism is part of the question, the screener is the AQ.
- Cognitive testing: usually the WAIS-IV, given by a psychologist. Its Japanese publisher gives an administration time of 60 to 90 minutes; the test has ten core subtests and five supplementary ones. If you were assessed abroad recently, note that the standardized adult Wechsler test in Japan is still the WAIS-IV. The WAIS-5 was published in the United States in 2024, but there is no Japanese edition yet, so a clinic here will test you on the WAIS-IV.
What can and can't the WAIS-IV tell you?
It profiles your cognitive strengths and weaknesses, and it cannot diagnose ADHD. Working memory is sometimes weaker than a person's own verbal and reasoning scores, but a review of published Wechsler results found that people with ADHD mostly score at age-expected levels, with working memory only slightly lower. Many people with ADHD have unremarkable WAIS profiles, and a "typical ADHD profile" can have other causes.
What the test can do:
- Document your profile objectively
- Strengthen a complicated diagnostic picture
- Distinguish attention problems from other explanations
- Give you concrete language for workplace accommodations
The test is not there to prove ADHD. Its job is to check what else could explain the difficulties, or sit alongside them: intellectual disability or borderline intellectual functioning, a learning disorder, and above all autism. Unlike ADHD, autism is linked to a more consistent WAIS profile, with reasoning relatively strong and processing speed weaker, although that profile cannot diagnose autism by itself either. The diagnostic criteria require that ADHD symptoms are not better explained by another condition, and autism can also be present alongside ADHD; the interview alone cannot settle these questions. So when ADHD is suspected, testing is usually part of the workup here, and the profile it produces is also what you will use later for accommodations.
What is the testing appointment like?
A separate visit with a psychologist, one to one, after the psychiatrist has taken your history. Cognitive testing is usually not done on the first visit. The psychiatrist's interview comes first, and testing is booked as its own appointment once the doctor has decided what the assessment should include. The results are explained at a further appointment; how soon depends on the clinic, so ask when you book. The diagnosis itself is made by the psychiatrist, with the test results as one input among three.
The WAIS-IV session is ten core subtests, given one at a time by the psychologist, covering verbal comprehension, perceptual reasoning, working memory, and processing speed. There is nothing to study for; the test is meant to show how you work as you are.
Practical points for the day:
- Be rested. Poor sleep lowers attention, working memory, and processing speed, which are what the test measures. Reschedule rather than test sick or exhausted.
- Ask about medication in advance. If you already take ADHD medication, whether to take it on the testing day depends on what the assessment is trying to show, and the clinic decides. Ask when the appointment is booked, not on the morning.
- Bring any earlier test report in full. Subtest and index scores, not just the summary page: a complete report is what lets a clinic decide whether testing needs to be repeated at all.
What's available in English in Tokyo?
English-language options exist in two forms:
- At Japanese psychiatry clinics with English capacity, you get the ordinary Japanese workup done in English: interview, rating scales, and testing where the doctor judges it useful. Ask what the assessment includes before you book, because that varies from clinic to clinic.
- Some private international practices offer a full assessment package with a written English report, which helps if you need documentation for an overseas employer or university.
The scores are most meaningful when the WAIS is given in a language you are fluent in, by a psychologist qualified to test in it. If your Japanese is conversational but not native, ask for testing in English.
What do you get at the end?
A results appointment, and a written report if you ask for one. The psychologist or psychiatrist goes through your profile: the four index scores, where you are relatively strong and weak, and how that fits, or does not fit, the interview and the rating scales. The diagnosis is the psychiatrist's call, made with all three layers in view. The assessment can confirm ADHD, point to a different explanation, or find both, and the diagnosis guide covers what happens in each case.
Ask for the written report at the start, because it is the part you will use afterwards:
- For workplace accommodations, a profile that documents slow processing speed or weak working memory gives an employer something concrete to act on, and a medical certificate can be based on it.
- For an overseas employer or university, an English report is usually what they expect. A Japanese clinic's report may be written in Japanese, so confirm the language at booking if you need English.
- For later care, in Japan or elsewhere, a full report with scores means the testing often does not have to be repeated.
Frequently asked questions
This article is general information, not medical advice for your individual situation. If you're unwell, please see a doctor.
Medically reviewed by our psychiatrist (M.D.). Updated October 16, 2026.