ADHD Test: How Screening and Diagnosis Work for Adults and Kids

There is no single ADHD test. The Centers for Disease Control and Prevention describes diagnosing ADHD as a process with several steps, partly because sleep disorders, anxiety, depression and some learning disabilities can cause similar symptoms^[1].

What people call an "ADHD test" is usually one of three things: a short screening questionnaire, a clinical evaluation, or a computer or brain-based measure. Only the clinical evaluation produces a diagnosis.

A 2024 systematic review of 231 diagnostic accuracy studies, published in Pediatrics, concluded that a valid ADHD diagnosis requires the judgment of an experienced clinician, aided by standardized rating scales and input from several informants across settings^[2].

This page covers how screening, evaluation and diagnosis work. The full symptom checklist is in ADHD symptoms, and how common the condition is appears in how many people have ADHD.

An ADHD diagnosis can be made by a mental health professional such as a psychologist or psychiatrist, or by a primary care provider such as a pediatrician^[1]. For children, one step is a medical exam that includes hearing and vision tests to rule out other problems^[1].

The clinician's core task is checking the person against DSM-5 criteria. The American Academy of Pediatrics (AAP) guideline calls for documenting symptoms and impairment in more than one major setting, such as social, academic or occupational life, using reports from parents or guardians, teachers, other school staff and involved mental health clinicians^[7]. The same guideline calls on the clinician to rule out any alternative cause^[7].

The criteria themselves set a high bar. Symptoms must have persisted for at least 6 months, several must have been present before age 12, and several must show up in two or more settings, such as home, school or work^[8].

An evaluation also screens for conditions that occur alongside ADHD or mimic it. The AAP lists anxiety, depression, oppositional defiant disorder, conduct disorders, substance use, learning and language disorders, autism spectrum disorder, tics and sleep apnea^[7].

Can ADHD be diagnosed through telehealth?

Yes, and many adults have been. In a national survey fielded in October and November 2023, 8.9% of U.S. adults with current ADHD said they received their diagnosis through telehealth only, and another 9.5% through a mix of telehealth and in-person visits^[4].

Those figures are self-reported and were not validated against medical records^[4].

An ADHD assessment for adults uses the same criteria as for children, with one change in the count. Adults and adolescents over 16 need five symptoms of inattention or of hyperactivity-impulsivity instead of six, and symptoms must have started before age 12^[9].

That childhood requirement shapes the adult evaluation. Because diagnosis relies heavily on past behavior, a provider may ask to talk with a partner, family members or friends, and may review school reports or other childhood records^[9].

Clinical interviews, behavior rating scales and symptom checklists are the standard tools. Some providers add psychological tests of memory, planning and reasoning to identify strengths, challenges and possible learning disabilities, and ask about mood and medical history to rule out other diagnoses^[9].

Adult diagnosis is common. In the 2023 NCHS Rapid Surveys System, 55.9% of U.S. adults with current ADHD reported being diagnosed at age 18 or older^[4]. Data on adults with the condition are on the ADHD in adults page.

The ASRS-5 adult ADHD screener

The best-studied ADHD screening for adults is the World Health Organization Adult ADHD Self-Report Scale. Its DSM-5 version, the ASRS-5, has six questions, and a score of 14 or higher counts as a positive screen^[3].

In its 2017 validation study, with results weighted to the general population, the ASRS-5 identified 91.4% of adults who met DSM-5 criteria and correctly cleared 96.0% of those who did not^[3]. Even so, only 67.3% of positive screens in that setting were true cases^[3].

In a clinic sample where 57.7% of patients had ADHD, specificity fell to 74.0%^[3]. The authors attributed the drop to the many clinic patients who had a meaningful number of symptoms without meeting full criteria^[3].

The AAP guideline tells pediatricians and other primary care clinicians to start an ADHD evaluation for any child or adolescent from age 4 to the 18th birthday who has academic or behavioral problems along with inattention, hyperactivity or impulsivity^[7]. The AAP rates that recommendation as strong, based on grade B evidence^[7].

For children, the evaluation leans on the adults who see the child every day. The AAP recommends asking parents, teachers and other caregivers about behavior at home, at school and with peers^[1].

Standardized parent and teacher rating scales are the usual way to collect that information. In the 2024 review, their reported accuracy varied widely, with areas under the curve from 0.55 to 0.95 across studies (higher is more accurate)^[2].

Free or low-cost routes exist. Local early intervention programs offer free or low-cost evaluations for children under 3, school systems offer free evaluations for children 3 and older, and early intervention does not require a doctor's referral^[1].

Data by age group are on the ADHD in children and ADHD in adolescents pages.

A free ADHD test online is usually either a copy of a published screener or an unvalidated quiz. Even a validated screener misfires: in the ASRS-5 general-population data, about one in three positive screens did not have ADHD^[3].

No questionnaire can check the rest of the criteria. A diagnosis also requires symptoms before age 12^[9], impairment documented in more than one setting, and a clinician ruling out other causes^[7].

Quizzes on social media add another layer of risk. A 2022 study of the 100 most popular #ADHD videos on TikTok, viewed 283,459,400 times in total, rated 52% as misleading, 27% as personal experience and 21% as useful^[5].

In that study, 37 of the 52 misleading videos presented symptoms common to many conditions, such as anxiety, anger, mood swings and relationship conflict, as specific to ADHD^[5]. Four gave an incorrect approach to diagnosis, including an audio quiz meant to determine whether a viewer has ADHD^[5].

Not on its own. The 2024 Pediatrics review covered neuropsychological tests, blood and urine biomarkers, EEG and brain imaging alongside rating scales, and rated the strength of evidence for every category as low because results varied so much between studies^[2].

The ranges show why. Reported sensitivity ran from 22% to 100% for neuropsychological tests, 46% to 100% for EEG, and 42% to 99% for neuroimaging, with the top figures coming from single unreplicated measures or machine-learning models^[2].

Accuracy also depended on the comparison group: results differed when children with ADHD were compared with typically developing peers rather than with other clinically referred children^[2].

One brain-wave device has FDA authorization. In July 2013, the FDA granted a de novo classification for the Neuropsychiatric EEG-Based ADHD Assessment Aid (NEBA), which measures the EEG theta/beta ratio in patients aged 6 to 17^[10].

The FDA order states that NEBA is not to be used as a stand-alone in the evaluation or diagnosis of ADHD, only as support for a clinician's completed evaluation^[10].

A diagnosis rests on judgment about whether behavior is impairing and out of step with a person's age, and that judgment can be skewed. A 2018 New England Journal of Medicine study of insurance claims looked at states with a September 1 cutoff for kindergarten entry^[6].

Children born in August, the youngest in their class, were diagnosed with ADHD at a rate of 85.1 per 10,000, compared with 63.6 per 10,000 for September-born children^[6]. The finding suggests that a child's age relative to classmates influences who gets diagnosed^[6].

A full evaluation includes checks that a screener or a single observer cannot supply: reports from more than one setting^[7], evidence that symptoms began before age 12^[9], and attention to conditions with overlapping symptoms such as anxiety, depression and sleep disorders^[1].

After diagnosis, medication classes and trial results are covered in ADHD meds, and national prescribing trends are in ADHD medication statistics.